Abstract: The invention relates to a laser light source (10), comprising an arrangement (120) of surface-emitting semiconductor lasers (1251, 1252, . . . 125n) to which a voltage is applied such that an operating current is below the threshold current and an intrinsic emission of the surface-emitting semiconductor laser is prevented. The laser light source also comprises a first semiconductor laser (100) which emits radiation (110) that enters the surface-emitting semiconductor laser such that induced emission takes place via the injection locking mechanism and the individual surface-emitting semiconductor lasers emit laser light having the same wavelength and polarisation direction as the irradiated radiation (110). The emission frequency of the first semiconductor laser can be changed by changing the operating current.

Abstract: A surface-emitting laser device disclosed in an embodiment of the invention includes a first region in which a plurality of first emitters is arranged; and a second region in which a plurality of second emitters is arranged, an area of the second region is smaller than an area of the first region, and the second region is disposed in a center region of the first region, and the first emitter and the second emitter may be driven separately.

Abstract: A laser irradiation head includes: a semiconductor laser module including a semiconductor laser element and a lens; a heat sink having a flow path of a refrigerant; and a first pipe connector that a first pipe for supplying the refrigerant to the flow path is attachable to and detachable from. The heat sink has an outer surface including a first area and a second area being in a relationship of intersecting with the first area, the semiconductor laser module is screwed to the heat sink in the first area, and the first pipe connector is screwed to the heat sink in the second area.

Abstract: A laser resonator assembly and a method of assembly of the laser resonator assembly are described. The laser resonator assembly has a gain element and an output coupler that are placed in a gain element frame and output coupler frame, respectively. The output coupler may also be a saturable absorber element so that the laser resonator assembly emits Q-switched pulses. The frames provide heat dissipation and can be easily aligned and permanently affixed in an appropriate alignment. A laser using the laser resonator assembly can be assembled in a low-cost manner.

Abstract: The present disclosure relates to an integrated light receiving and emitting device combined with a control circuit wafer and a manufacturing method thereof. The integrated light receiving and emitting device combined with a control circuit wafer according to an exemplary embodiment of the present disclosure includes: a light receiving and emitting unit which has an integrated wafer structure in which a light emitting unit and a light receiving unit are vertically formed on one surface of a single semiconductor substrate by wafer patterning and a control circuit wafer which is combined with the light receiving and emitting unit by vertical bonding to be operated as a single chip device, in which the control circuit wafer is connected to the light emitting unit and the light receiving unit.

Abstract: An optical arrangement for pulse compression of a pulsed laser beam includes a grating arrangement comprising at least one diffraction grating, and a beam-expanding device comprising at least one beam-expanding optical element for forming a divergent pulsed laser beam that enters the grating arrangement divergently.

Abstract: To provide a light-emitting apparatus capable of shaping light from a plurality of light-emitting elements into light with a plurality of shapes and a manufacturing method thereof. A light-emitting apparatus according to the present disclosure, including: a substrate; a plurality of light-emitting elements which are provided on a side of a first surface of the substrate; and a plurality of first lenses which are provided on a side of a second surface of the substrate and on which light emitted from the plurality of light-emitting elements is incident, wherein the plurality of first lenses include at least two types of lenses among a concave lens, a convex lens, and a flat lens.

Abstract: A high speed spatial light modulators are described. In one non-limiting example, an optical phased array structure comprises a vertical cavity surface-emitting laser (VCSEL) that provides a light beam and a phase delay unit that includes a bi-layer photonic crystal slab. The bi-layer photonic crystal slab (PCS) is attached to the VCSEL and comprises two silicon PCS layers separated by a dielectric layer. The optical phased array structure is configured to control a direction of the light beam by a voltage applied to the phase delay unit. By incorporating a dispersive layer (e.g. graphene), the absorption of the structure can be modulated and accordingly the reflection of the surface can be modulated as well.

Abstract: An excimer laser includes a chamber for containing a gas mixture between a rear end and a front end of a linear laser resonator, a convex end-mirror defining the rear end, and a plurality of output-coupling mirrors collectively defining the front end. The output-coupling mirrors are distributed along an optical axis of the resonator and have respective normal vectors pointing toward the rear end. The normal vectors include four mutually non-parallel normal vectors, wherein no three of the four mutually non-parallel normal vectors are coplanar. These different orientations of the output-coupling mirrors cooperate with the convex end-mirror to blur fine structure in the output beam of the resonator.

Abstract: The present disclosure includes a method for driving a laser system, wherein the laser system includes: at least one laser diode arranged for light emission; an electronic circuit configured for driving the laser diode by applying an electric drive current; and a power sensor arrangement including at least one power sensor for measuring an optical power output, wherein the method includes: applying and maintaining the electric drive current to the at least one laser diode at a setpoint; determining measurement values of a current optical power output by the power sensor arrangement; comparing the measurement values of the current optical power output with a target optical power output; and adjusting and maintaining the electric drive current at a new setpoint when an absolute value of a difference between the target optical power output and the current optical power output crosses a threshold.

Abstract: Provided is a light transmitter, including: a substrate; a semiconductor refrigeration assembly arranged on the substrate; a light emitting assembly mounted on the semiconductor refrigeration assembly, so that the semiconductor refrigeration assembly cools the light emitting assembly, and the light emitting assembly is configured to generate a laser beam; a tube shell mounted on the substrate to package the semiconductor refrigeration assembly and the light emitting assembly; an optical fiber configured to output the laser beam generated by the light emitting assembly to an outside of the tube shell; and a transparent filling glue filled in a space between an inner wall of the tube shell and the substrate, and configured to guide the laser beam generated by the light emitting assembly to the optical fiber and transfer a heat generated by the light emitting assembly to the tube shell.

Abstract: A laser apparatus according to an aspect of the present disclosure includes a laser oscillator configured to emit a pulse laser beam, and a first optical pulse stretcher, a second optical pulse stretcher, and a third optical pulse stretcher that are disposed on an optical path of the pulse laser beam. When L1 represents an optical path length of a delay optical path of the first optical pulse stretcher, L2 represents an optical path length of a delay optical path of the second optical pulse stretcher, L3 represents an optical path length of a delay optical path of the third optical pulse stretcher, and n represents an integer equal to or larger than two, L2 is an integral multiple of L1 by an integer equal to or larger than two and L3 satisfies the following condition: (n?0.75)×L1?L3?(n?0.25)×L1.

Abstract: A fiber amplifier is provided, including a pump laser (202), a pump and signal combiner (203), and a few-mode doped fiber (204). The pump laser (202) is configured to output pump light. The pump and signal combiner (203) is configured to couple input few-mode signal light and the pump light into the few-mode doped fiber (204). Refractive indexes of a fiber core of the few-mode doped fiber (204) are distributed to be gradient along a radial direction of a cross section, the fiber core is etched with periodic gratings along an axial direction, and periods of the gratings satisfy a phase matching condition. The fiber amplifier achieves strong coupling and co-amplification between optical signal modes, thereby reducing a differential gain between mode groups.

Abstract: The invention relates to a device (10) for amplifying a laser pulse which comprises a divider section (14) for dividing the laser pulse into multiple sub pulses (43) and for introducing a time delay between the sub pulses (43), a compressor section (15) for compressing the temporally divided sub pulses (43) and a combiner section (17) for combining the compressed sub pulses (44) to one compressed laser pulse (45).

Abstract: A light source device includes: a substrate having a support face; a lateral wall part disposed on the substrate and having an upper face and inner wall faces, the inner wall faces defining a space; a laser diode located in the space; a first submount having a mounting face bonded to an upper face of the laser diode, and an upper face located opposite the mounting face; a sealing member bonded to the upper face of the lateral wall part and the upper face of the first submount, thereby sealing the space; a heat dissipating block located above the first submount; and a heat conducting member located between the first submount and the heat dissipating block.

Abstract: A diffractive optical element, such as a plasma grating, can be made by directing two laser beams so that they overlap in a nonlinear material to form an interference pattern in the nonlinear material. The interference pattern can modify the index of refraction in the nonlinear material to produce the diffractive optical element. This diffractive optical element may be used to separate the peak of a laser pulse from light preceding the peak thereby increase the temporal contrast of a laser pulse such as a compressed laser pulse.

Abstract: The invention relates to a device for generating a sequence of laser pulses consisting of pulse bursts. The object of the invention is to provide a possibility of generating laser pulses for material processing in the burst mode at a high quality based on the principle of beam combination.

Abstract: A semiconductor optical device includes: a lower mesa structure extending in a stripe shape and composed of some layers including an active layer; a buried layer configured to bury both sides of the lower mesa structure and made of indium phosphide; and an upper mesa structure extending in a stripe shape and composed of some layers including a bottom layer made of phosphorus-free materials, the bottom layer having a bottom surface protruding from a topmost layer of the lower mesa structure, the bottom surface being in contact with the lower mesa structure and the buried layer.

Abstract: Disclosed is a laser apparatus including a laser generator comprising a laser medium, a pumping light source providing light to the laser medium, a first mirror and a second mirror arranged with the laser medium therebetween, and configured to generate a laser beam of a first wavelength, a secondary harmonic wave generator configured to generate a laser beam of a second wavelength from the laser beam of a first wavelength, a light modulator arranged between the laser medium and the secondary harmonic wave generator and configured to adjust a pulse width of the laser beam of a first wavelength, and an output adjustor configured to adjust an output of the laser beam of a second wavelength generated in the secondary harmonic wave generator.

Abstract: An optical element is positioned in a holder over a laser light source. The optical element includes an electrical trace that is coupled between first and second pads. A sensing circuit that is also coupled to the first and second pads performs a voltage/current sensing operation to detect displacement of the optical element and control enablement of the laser light source.