Abstract: An optical emitter-receiver module includes a light source, a photodetector and a fiber. The light source emits an emitted beam. The fiber includes a core and an optical axis. The fiber has an outer surface, inclined at an angle of 45° with respect to the optical axis, having a mirror. The fiber has a notch, extending to the core of the fiber and having a face having a dichroic filter for reflecting a received beam. The light source is arranged relative to the mirror so that the emitted beam is reflected by the mirror and transmitted in the fiber. The photodetector and the face of the notch are positioned so that the received beam reflected by the dichroic filter is directed towards the photodetector.

Abstract: A system and method for adaptive illumination, the imaging system comprising an excitation source having a modulator, which generates a pulse intensity pattern having a first wavelength when the excitation source receives a modulation pattern. The modulation pattern is a data sequence of a structural image of a sample. An amplifier of the imaging system is configured to receive and amplify the pulse intensity pattern from the modulator. A frequency shift mechanism of the imaging system shifts the first wavelength of the pulse intensity pattern to a second wavelength. A laser scanning microscope of the imaging system receives the pulse intensity pattern having the second wavelength.

Abstract: Laser systems and methods are disclosed. One laser system comprises: a plurality of laser resonators, each resonator being operable to discharge an input laser beam; a relay assembly including at least one curved reflective surface that redirects each input laser beam, and reduces a beam size of the redirected beam; a galvo including a curved reflective surface that receives each redirected beam, and outputs a combined laser beam at power level greater than a power level of each laser input beam; and a coupling assembly that reduces spherical aberrations in the combined laser beam, and directs the combined laser beam into an optical fiber. In this system, the combined laser beam may have a maximum beam parameter product lower than a minimum beam parameter product of the optical fiber. Related systems and methods are also disclosed.

Abstract: A near-eye display device comprises a pupil-expansion optic, a laser, a drive circuit coupled operatively to the first and second lasers, a spatial light modulator (SLM), and a computer. The SLM has a matrix of electronically controllable pixel elements and is configured to receive emission from the laser and to direct the emission in spatially modulated form to the pupil-expansion optic. Coupled operatively to the drive circuit and to the SLM, the computer is configured to parse a digital image, trigger the emission from the laser by causing the drive circuit to drive a periodic current through a gain structure of the laser, and control the matrix of pixel elements such that the spatially modulated form of the emission projects an optical image corresponding to the digital image, wherein the periodic current includes plural cycles of modulation driven through the gain structure while the optical image is projected.

Abstract: One or more embodiments relates to a method of growing ultrasmooth and high quantum efficiency CsTe photocathodes. The method includes exposing a substrate of Cs using an alkali source such as an effusion cell; and controlling co-evaporating growth and co-deposition forming a CsTe growth. The method further includes monitoring a stoichiometry of the CsTe growth.

Abstract: A mid-infrared broadband laser including: a femtosecond laser configured to generate a near-infrared light; nonlinear waveguide configured to broaden and/or shift a spectrum of the light from the femtosecond laser; and a nonlinear medium configured to generate a broadband light by mixing spectral components of the output from the non-linear waveguide. Optionally, at least one dispersion compensation element may be placed between the femtosecond laser and the nonlinear waveguide and/or between the nonlinear waveguide and the nonlinear medium.

Abstract: Embodiments relate to a resonator including a graphene layer formed on a support, and a tapered fiber disposed around at least part of the support, close to the graphene layer, wherein the tapered fiber has different paths along which light travels in a region extending from one end and a region extending from the other end, and a passive-mode-locked pulse laser oscillation system including the same.

Abstract: The invention relates to a frequency conversion arrangement (100) for optimising properties of a harmonic of a laser, in particular a beam profile and/or a long-term stability, the arrangement comprising:—a first non-linear crystal (X1), which is designed to convert a first wavelength (?1) partially into a second wavelength (?2); and—an optical unit, which in particular comprises at least one prism (P), which is designed in such a way as to influence the main axes (x1, y1, x2, y2) of the beam profiles of the first wavelength (?1) and/or the second wavelength (?2) differently; and—a second non-linear crystal (X2), which is designed in such a way as to generate a third wavelength (?3) from the unconverted part of the first wavelength (?1) and/or the second wavelength (?2), the second non-linear crystal (X2) having an entry face (A1) and an exit face (A2), and the exit face (A2) running obliquely to the entry face (A1).

Abstract: A surgical laser system (100) includes a first laser source (140A), a second laser source (140B), a beam combiner (142) and a laser probe (108). The first laser source is configured to output a first laser pulse train (144, 104A) comprising first laser pulses (146). The second laser source is configured to output a second laser pulse train (148, 104B) comprising second laser pulses (150). The beam combiner is configured to combine the first and second laser pulse trains and output a combined laser pulse train (152, 104) comprising the first and second laser pulses. The laser probe is optically coupled to an output of the beam combiner and is configured to discharge the combined laser pulse train.

Abstract: A laser system is configured for providing a laser line in a working plane for line illumination of an object. The laser line extends in a first direction over a significant length and in a second direction over a small extent. The laser system comprises a laser source for providing a laser beam as basis for an elongated input laser beam propagating along a propagation direction, and a homogenization and focussing unit for homogenizing the elongated laser beam to form the laser line. The laser system is in particular suitable for providing a laser line that can be stitched to another laser line of a respective further laser system.

Abstract: A pulsed light generation device, includes: a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; and a second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein: at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; and self-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber.

Abstract: Provided are an integrated super-resolution laser direct-writing device and a direct-writing method. The integrated super-resolution laser direct-writing device includes a first continuous laser, a first optical fiber coupler, a mono-mode optical fiber, a second continuous laser, a second optical fiber coupler, a first annular photonic crystal fiber, a bifurcated optical fiber, a lens group, a first dichroic mirror, an LED light source, a lens, a second dichroic mirror, an auto-focusing module, a third dichroic mirror, a third optical fiber coupler, a square-law graded index fiber, a nanometer displacement table, a second lens, a CMOS camera and a control system. According to the present invention, an original large direct-writing device based on a free optical path can achieve optical fibers of key devices and integration of systems and can be better applied to the field of laser direct-writing.

Abstract: A system for controlling a pulsed laser diode includes a power source configured to supply power to the pulsed laser diode and at least one driving branch between the power source and the pulsed laser diode. The at least one driving branch is configured to control power delivery from the power source to the pulsed laser diode. The at least one driving branch is connected to a cathode of the pulsed laser diode.

Abstract: A laser ablation apparatus includes: a laser beam generator including beam sources for generating laser beams, the laser beam generator using a solid-state laser; an output beam generator for generating an output beam using the laser beams; and a substrate stage including at least one stage on which a carrier substrate formed on the front of a panel substrate is disposed. The output beam generator may include: mixers for generating mixed laser beams having two linear-polarizations orthogonal to each other by mixing the laser beams; and a photo molding machine for generating the output beam using the mixed laser beams.

Abstract: A fiber optic ring laser, and non-transitory computer readable medium for using a fiber optic ring laser are disclosed. The disclosed fiber optic ring laser includes a semiconductor booster optical amplifier (BOA), as a gain medium; a Fiber Fabry Perot Tunable Filter (FFP-TF), as a wavelength selection element; an optical isolator (ISO) to insure unidirectional operation of the fiber optic ring laser; and a polarization controller (PC) for attaining an optimized polarization state in order to achieve a stable-generated output in terms of output power and wavelength, wherein the BOA, the FFP-TF, the ISO and the PC are coupled to form a ring configuration that implements a continuously tunable booster amplifier-based fiber ring laser.

Abstract: The present invention discloses a high-peak-power single-frequency narrow-linewidth nanosecond fiber laser based on a triangular pulse, wherein the laser includes: pulsed laser generated by the laser seed injecting into a first power pre-amplifier through a first isolator, and then injecting into a second pre-amplifier and then injecting into a power amplifier; wherein triangle-shaped pulsed laser with fast rising edge is obtained by using electro-optic and acousto-optic modulator to modulate continuous wave single-frequency laser or a single-frequency semiconductor laser directly modulated by radio frequency signal; single-frequency triangle-shaped pulsed laser is employed as the laser source according to the characteristics of narrow intrinsic linewidth and suppression of linewidth broadening caused by SPM, and the power of pulsed laser is amplified through the MOPA system.

Abstract: A system and method for tuning and infrared source laser in the Mid-IR wavelength range. The system and method comprising, at least, a plurality of individually tunable emitters, each emitter emitting a beam having a unique wavelength, a grating, a mirror positioned after the grating to receive at least one refracted order of light of at least one beam and to redirect the beam back towards the grating, and a micro-electro-mechanical systems device containing a plurality of adjustable micro-mirrors.

Abstract: A laser oscillator includes a housing, an optical fiber disposed in the housing and including a fused portion or a curved portion, an optical absorber positioned between the housing and the fused portion or the curved portion and configured to absorb leakage light from the optical fiber, a thermally conductive support column configured to support the optical absorber, and a cooling unit configured to cool the optical absorber via the thermally conductive support column.

Abstract: A system and method for high speed communication are provided. The system comprises a laser-based system for communication, the system comprising: an acquisition module configured to acquire and characterize a plurality of laser beams; a tracking module configured to track the acquired laser beams, the tracking module comprising: a beaconing feedback and beam divergence mechanism configured to control a beam and detect a beam; an adaptive learning unit configured to implement an adaptive learning detection algorithm to identify and track a unique optical signature from at least one of the acquired laser beams; and a pointing module configured to point at least one laser beam towards a target based on the acquired laser beams.

Abstract: Method and system for a laser welding process employing the use of a single pulsed fiber laser source configured to generate a radiative output with a wavelength spectrum extending from about 1.8 microns to about 2.6 microns. In a specific case, the laser output from the single pulsed fiber laser source is focused onto the interface of the two pieces of materials at least one of which includes any of glasses, inorganic crystals, and semiconductors.

Abstract: A reflective cable system for a geophysical survey system includes a reflective cable that includes a conductive wire surrounded by an electrically insulating sheath and an exterior surface. The reflective cable includes reflective material that is on or visible through the exterior surface and that is configured to reflect a complete spectrum of light provided by a light source back to the light source. The reflective cable system also includes a connector electrically coupled to at least one end of the reflective cable and configured to couple to a geophysical survey system. The reflective cable may be used to locate the reflective cable in a physical environment and used to determine a position of the reflective cable using lidar or photogrammetry for generating geophysical survey models.

Abstract: Embodiments discussed herein refer to LiDAR systems and methods that enable substantially instantaneous power and frequency control over fiber lasers. The systems and methods can simultaneously control seed laser power and frequency and pump power and frequency to maintain relative constant ratios among each other to maintain a relatively constant excited state ion density of the fiber laser over time.

Abstract: A laser oscillator includes a first structure disposed with an optical section, a second structure disposed with a power source section, and an electric cable that electrically connects the optical section and the power source section. The first structure is removably coupled to the second structure, the electric cable is removably connected to at least one of the power source section and the optical section, and the optical section is allowed to be replaced.

Abstract: Provided are a depth information camera module and a base assembly, a projection assembly, an electronic device and a manufacturing method thereof. The depth information camera module includes: a projection assembly to project a laser to a to-be-detected object; a receiving assembly, including a photosensitive element for receiving the laser reflected from the to-be-detected object; and a base assembly, the base assembly including a circuit board and a base body, the base body being supported by the circuit board, where the photosensitive element is electrically connected to the circuit board, the projection assembly circuit board is supported on a top side of the base body such that the circuit board and the projection assembly circuit board are respectively at different heights of the base assembly. Here, the projection assembly has an integral structure to facilitate assembly of the projection assembly.

Abstract: A laser system produces pulses having wavelengths between 2000 nm and 2100 nm, peak output powers greater than 1 kW, average powers greater than 10 W, pulse widths variable from 0.5 to 10 nsec, pulse repetition frequencies variable from 0.1 to over 2 MHz, and a pulse extinction of at least 60 dB. Pulses from a diode laser having a wavelength between 1000 nm and 1100 nm are amplified by at least one fiberoptic amplifier and applied as the pump input to an Optical Parametric Amplifier (OPA). A cw laser provides an OPA seed input at a wavelength between 2000 nm and 2200 nm. The idler output of the OPA having difference frequency wavelength between 2000 nm and 2100 nm is further amplified by a crystal amplifier. The fiberoptic amplifier can include Ytterbium-doped fiberoptic. The crystal amplifier can include a Ho:YAG, Ho:YLF, Ho:LuAG, and/or a Ho:Lu2O3 crystal.

Abstract: Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

Abstract: In one embodiment, a lidar system includes a light source configured to emit local-oscillator light and pulses of light, where each emitted pulse of light is (i) coherent with a corresponding portion of the local-oscillator light and (ii) includes a spectral signature of one or more different spectral signatures. The lidar system also includes a receiver configured to detect the local-oscillator light and a received pulse of light, the received pulse of light including light from one of the emitted pulses of light scattered by a target located a distance from the lidar system, the one of the emitted pulses of light including a particular spectral signature of the one or more spectral signatures. The local-oscillator light and the received pulse of light are coherently mixed together at the receiver. The receiver includes one or more detectors and a frequency-detection circuit.

Abstract: A method for expanding a dynamic range of a light detection and ranging (LiDAR) system is provided. The method comprises transmitting, using a light source of the LiDAR system, a sequence of pulse signals consisting of two or more increasingly stronger pulse signals. The method further comprises receiving, using a light detector of the LiDAR system, one or more returned pulse signals corresponding to the transmitted sequence of pulse signals. The one or more returned pulse signals are above the noise level of the light detector. The method further comprises selecting a returned pulse signal within the dynamic range of the light detector, identifying a transmitted pulse signal of the transmitted sequence that corresponds to the selected returned pulse signal, and calculating a distance based on the selected returned signal and the identified transmitted signal.

Abstract: A cladding mode stripper, includes: a resin part that covers a coating-removed section of an optical fiber and has a refractive index not less than that of an outermost shell of the optical fiber in the coating-removed section. A surface of the resin part includes an incident angle reducing structure. The surface is opposite to an interface between the resin part and the outermost shell. The incident angle reducing structure reduces a first incident angle or a first average incident angle at which cladding mode light that has entered the resin part from the optical fiber enters the surface.

Abstract: Multi-stage fiber amplifiers can amplify signals from a few Watts to several kilowatts. These amplifiers are limited in power by intensity instabilities resulting from a sequence of nonlinear optical effects. These nonlinear optical effects include stimulated Brillouin scattering (SBS), with produces a high-intensity pulse close to the signal wavelength that propagates backward up the amplifier chain, causing permanent damage to the upstream components. This SBS pulse can be blocked by an optical isolator that blocks backward-propagating light at or near the signal wavelength. At high enough power levels, the SBS pulse can also induce backward-propagating light at wavelengths tens to hundreds of nanometers away from the signal wavelength. This SBS-Pulse Induced Non-linear Spectrum light is outside the isolator's reject band, so it can propagate upstream and de-stabilize the upstream amplifier stages.

Abstract: A fiber laser system based in solitonic passive mode-locking, including a laser diode to emit and deliver an optical signal of a first wavelength; a single-fiber laser cavity including a dichroic mirror, a SESAM and a polarization maintaining highly-doped active fiber, to receive the emitted signal and to emit a pulsed optical signal of a second wavelength, generating laser light in the form of mode-locked ultrashort pulses; a unit coupling the laser diode to the single-fiber laser cavity; and an isolator device protecting the cavity from back reflections. The solitonic mode-locked ultrashort pulses are comprised in a range of 100 fs<10 ps with repetition rates of hundreds MHz to tens of GHz.

Abstract: The single mode optical fiber disclosed herein has a core, an inner cladding, a trench and an outer cladding, along with a non-glass protective coating. The refractive index profile of the optical fiber is such that the optical fiber has relatively low bend loss at both small and large bend diameters. The relative refractive indices of the inner cladding, trench and outer cladding are such that a tunneling point that arises during bending is pushed out beyond the trench and thus sufficiently far away from the core so that bending losses for both small and large radius bends are relatively small.

Abstract: A pulsed light generation device, includes: a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; and a second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein: at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; and self-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber.

Abstract: A doped fiber amplifier is proposed that includes both a Ho-doped amplifier (used as a preamplifier) and a Tm-doped amplifier (used as a power amplifier). The Ho-doped preamplifier typically uses a single clad (SC) optical fiber as the gain element, with both the propagating signal and pump beam introduced into the Ho-doped core of the SC fiber. The Tm-doped power amplifier typically utilizes a double clad (DC) optical fiber as the gain element, which allows for a multimode pump to propagate within the Tm-doped core region and inner cladding, providing efficient high power amplification of the signal received at its input.

Abstract: Embodiments relate to a noise suppressor for suppressing noise of an optical signal, including a core through which the optical signal travels, a clad that is wrapped around the core and configured to expose part of the core, and a graphene layer formed on the part of the core, and a digital optical signal generation system including the same.

Abstract: A semiconductor laser diode light source package includes: a seed light source for outputting signal beams; a pump beam source for outputting pump beams; and at least one mirror for transmitting the signal beams to a core of an output optical fiber and transmitting the pump beams to first cladding of the output optical fiber, wherein the seed light source, the pump beam source, and the at least one mirror are realized in a semiconductor chip, and the output optical fiber is connected to an end terminal of the semiconductor laser diode light source package.

Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.

Abstract: The present disclosure relates to optical fiber amplifying systems having operability at a wide variety of ambient temperatures and to methods for using them. One aspect of the disclosure is an optical fiber system configured to provide amplified radiation. The system includes an active optical fiber; a plurality of grating-locked pump sources, each having an output optically coupled to the active optical fiber; one or more temperature sensors, configured to measure a temperature associated with one or more of the grating-locked pump sources; and a control system configured to accept measurements from the one or more temperature sensors and, for a desired total pump power output, to provide to one or more of the grating-locked pump sources a set of drive currents suitable to provide the desired total pump power output.

Abstract: In various embodiments, optical repositioners and/or angled dispersive elements are utilized to manipulate portions of an input laser beam emitted by a group of laser emitters in order to form a multi-wavelength output beam having a high beam quality factor.

Abstract: Embodiments include apparatuses, methods, and systems including a dynamic polarization controller (DPC) to receive a first light beam and a second light beam, to adjust a rotation of a state of polarization (SOP) of the first light beam and the second light beam to generate a third light beam and a fourth light beam, under the control of a first control signal, a second control signal, and a third control signal. The first control signal may be related to a phase difference between the third light beam and the fourth light beam, the second control signal may be related to an intensity difference between the third light beam and the fourth light beam, and the third control signal may be related to a rotation of a SOP of the third light beam and the fourth light beam. Other embodiments may also be described and claimed.

Abstract: A light-emitting device improves the beam quality of emission light from a single emitter light source in the slow-axis direction, and includes a light source 10 having a single emitter and a beam shaping module that splits the emission light from the light source into to a plurality of split-lights in the slow-axis direction, and shapes the split-lights as a shaped-beam arrayed in the fast-axis direction, and outputs the shaped-beam.

Abstract: Beam combining optical systems include a fiber beam combiner having multiple inputs to which output fibers of laser diode sources are spliced. Cladding light stripping regions are situated at the splices, and include exposed portions of fiber claddings that are at least partially encapsulated with an optical adhesive or a polymer. A beam combiner fiber that is optically downstream of a laser source has an exposed cladding secured to a thermally conductive support with a polymer or other material that is index matched to the exposed cladding. This construction permits attenuation of cladding light propagating toward a beam combiner from a splice.

Abstract: A doubly resonant optical parametric oscillator (1) includes a fan-out crystal (5, 55, 105) having an optical non-linearity of order 2 and placed in an optical cavity (6) able to reflect a pump (2). The crystal (5, 55, 105) has an entrance face (59) and an exit face (60), through which faces the optical axis passes, an upper face (57) and a lower face (58).

Abstract: A photonic integrated circuit may include a substrate and an optical waveguide integrated with the substrate. The optical waveguide may include a bend section, wherein a bend shape of the bend section is defined by a curvature function to suppress waveguide mode conversion.

Abstract: Aspects of the present disclosure describe systems, methods, and structures that advantageously amplify optical signals through the effect of optical pump signals generated by a multicore laser diode and multicore rare-earth doped optical fiber in optical communication with a 3D waveguide structure and a multicore input signal fiber providing a plurality of optical signals for amplification.

Abstract: Methods for synthesizing fibers having nanoparticles therein are provided, as well as preforms and fibers incorporating nanoparticles. The nanoparticles may include one or more rare earth ions selected based on fluorescence at eye-safer wavelengths, surrounded by a low-phonon energy host. Nanoparticles that are not doped with rare earth ions may also be included as a co-dopant to help increase solubility of nanoparticles doped with rare earth ions in the silica matrix. The nanoparticles may be incorporated into a preform, which is then drawn to form fiber. The fibers may beneficially be incorporated into lasers and amplifiers that operate at eye safer wavelengths. Lasers and amplifiers incorporating the fibers may also beneficially exhibit reduced Stimulated Brillouin Scattering.

Abstract: Consistent with the present disclosure, codewords indicative of a super Gaussian distribution may be encoded and decoded using the encoders and decoders disclosed herein. Based on such codewords, symbols may be transmitted in accordance or in conformance with a super Gaussian distribution to tailor the SE of an optical signal or subcarrier for a given link having non-linear degradations and shaping gain. Such tailed SE may not be achievable with a Gaussian symbol transmission probability distribution.

Abstract: A warning device for preventing underground cables against accidental excavation comprises an optical fiber vibration sensor having a mode recognition function, a signal processing unit, a wireless communication unit and a power supply unit, wherein the signal processing unit is connected to the optical fiber vibration sensor, the wireless communication unit and the power supply unit, and the optical fiber vibration sensor is installed within a set range of a cable and is used to monitor vibration signals around the cable, so that once a behavior possibly endangering the cable occurs, an alarm is given out in time to reduce power transmission and transformation accidents. Compared with the prior art, the warning device has the advantages of low false alarm rate, rapid response and accurate localization region.

Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source configured to emit light having different wavelengths, a waveguide, and an optical coupler configured to couple the emitted light from the first optical source to the waveguide. The optical transmitter further includes an array of two or more second optical sources coupled to the waveguide, each of the two or more second optical sources configured to be injection locked to a different respective wavelength of the emitted light transmitted via the waveguide from the first optical source. In some implementations, the first optical source is a master comb laser and the two or more second optical sources are slave ring lasers.

Abstract: A laser system based on nonlinear pulse compression and a LMA optical fiber therefor are provided. The LMA optical fiber is configured to amplify seed light pulses and promote the onset of nonlinear spectral broadening. The LMA optical fiber includes a first section having constant core and cladding diameters and receiving and supporting propagation of the light pulses in multiple transversal modes. The first section is configured to suppress high order modes propagating therealong. The LMA optical fiber further includes a tapered second section receiving the fundamental mode from the first section, the core and cladding diameters increasing gradually along said second section so as to provide an adiabatic transition of the fundamental mode. The LMA optical fiber further includes an optional third section having constant core and cladding diameters. Dispersive compression of the light pulses outputted by the LMA optical fiber provides excellent beam quality and high peak powers.