Abstract: A spectroscopic measuring apparatus (100) being configured for measuring a spectral response of a sample (1), in particular a biological sample, comprises a fs laser source device (10) being arranged for an irradiation of the sample (1) with a sequence of probe light pulses (2) having a primary spectrum, a detector device (20) being arranged for a temporally and/or spectrally resolved detection of response light pulses (2?) having an altered spectrum and/or temporal structure and resulting from an interaction of the probe light pulses (2) with the sample (1), and a pulse modification device (30) comprising at least one quantum cascade laser (31 . . . 3N), wherein the pulse modification device (30) is configured to modify at least one of the probe light pulses (2) and the response light pulses (2?) by amplifying one or more spectral components of the at least one of the probe light pulses (2) and the response light pulses (2?) with the at least one quantum cascade laser (31 . . . 3N).

Abstract: A multiple frequency comb source apparatus (100) for simultaneously creating a first laser pulse sequence representing a first frequency comb (1) and at least one further laser pulse sequence representing at least one further frequency comb (2), wherein at least two of the first and at least one further pulse sequences have different repetition frequencies, comprises a laser resonator device (10) comprising multiple resonator mirrors including first end mirrors EM1,OC1 providing a first laser resonator (11), a laser gain medium (21, 22) being arranged in the laser resonator device (10), and a pump device (30) being arranged for pumping the laser gain medium (21), wherein the laser resonator device (10) is configured for creating the first and at least one further laser pulse sequences by pumping and passively mode-locking the laser gain medium (21), the resonator mirrors of the laser resonator device (10) include further end mirrors EM2, OC2 providing at least one further laser resonator (12), the first laser

Abstract: A method for photonic sampling of a test-waveform is provided. The method includes providing a sampling light pulse and generating a local oscillator by frequency multiplication of the sampling light pulse. The method further includes generating a signal wave by frequency mixing of the sampling light pulse and the test-waveform in a nonlinear optical element, wherein the frequency multiplication of the sampling light pulse and the frequency mixing of the sampling light pulse and the test-waveform are selected such that the local oscillator and the signal wave are at least partly spectrally overlapping. Moreover, the method includes detecting an interference signal of the local oscillator and the signal wave for various time delays of the sampling light pulse with respect to the test-waveform. A device for sampling a test-waveform is also disclosed.

Abstract: A method of passively enhancing pulsed laser light by coherent addition of laser pulses in an enhancement cavity (20) comprises the steps of generating a sequence of seed laser pulses (1) with a repetition frequency frep and a frequency comb spectrum (3) comprising frequency comb lines (4) with frequency comb line spacings equal to the repetition frequency frep, coupling the seed laser pulses (1) via a first plate-shaped coupling element (25) into an enhancement cavity (20) comprising at least two cavity mirrors (21, 22, 23, 24) having metallic surfaces and spanning a cavity beam path (26) with a resonator length L, wherein the enhancement cavity (20) has a fundamental transverse mode TEM00 and higher-order transverse cavity modes TEMnm, each with a series of cavity resonance frequencies (5), and a cavity offset frequency (6), and coherent superposition of the seed laser pulses (1) in the enhancement cavity (20), so that at least one enhanced circulating cavity pulse (2) per cavity length is generated, wherei

Abstract: A laser oscillator system includes a resonator cavity for confining an intra-cavity laser beam. The laser oscillator system further includes a Cr-doped II-VI gain medium arranged within the resonator cavity and an imaging unit forming part of the resonator cavity. The imaging unit is configured to decouple a spot size of the intra-cavity laser beam at the gain medium from an intra-cavity length of the resonator cavity. Moreover, the resonator cavity and the imaging unit are configured such that the laser oscillator system emits laser pulses at a repetition rate of 50 MHz or less. Further, a laser system and methods for generating light pulses having spectral components at a wavelength of at least 2 ?m are disclosed.

Abstract: A laser system generates laser pulses having a determined carrier-envelope-offset, CEO. The laser system includes a Cr-doped II-VI based laser oscillator system having a resonator cavity, which emits laser pulses having a peak power of at least 0.75 MW. The laser system further includes a nonlinear optical element for spectrally broadening at least a part of the emitted laser pulses irradiated onto the nonlinear optical element to provide the laser pulses with octave-spanning spectral components, and a frequency-doubling element for generating second harmonic spectral components of at least a part of the octave-spanning spectral components. In addition, the laser system includes an f-2f-interferometry device for generating a beating signal of at least a part of the overlapping spectral components exiting the frequency-doubling element and interfering with each other at the f-2f-interferomtry device and for determining and/or controlling the CEO of the emitted laser pulses based on the beating signal.

Abstract: A laser pulse sequence measuring method for measuring a delay between a pair of pulses from two laser pulse sequences (1, 2), comprises the steps of creating a first laser pulse sequence (1) of first laser pulses (1A) and a second laser pulse sequence (2) of second laser pulses (2A), and generating a delay signal (3) which represents the delay between the pair of pulses from the first and second laser pulse sequences (1, 2), wherein the step of generating the delay signal (3) includes creating intra-pulse difference frequency generation (IPDFG) pulses (4) by applying intra-pulse difference frequency generation to the first laser pulses (1A) in a difference frequency generation (DFG) medium (21), providing phase-stable reference waveforms (5) based on the IPDFG pulses (4), and electro-optic sampling (EOS) of the electric field of the phase-stable reference waveforms (5) with sampling pulses (6) in an EOS medium (22), wherein the sampling pulses (6) are created based on the second laser pulses (2A), for generat

Abstract: A laser device (100), being configured for generating laser pulses by Ken lens based mode locking, comprises a laser resonator (10) with a plurality of resonator mirrors (11.1, 11.2, 11.

Abstract: A particle analysis method and apparatus, including a spectrometry-based analysis of a fluid sample (1), comprises the steps of creating a sample light beam S and a probe light beam P with a light source device (10) and periodically varying a relative phase between the sample and probe light beams S, P with a phase modulator device (20), irradiating the fluid sample (1) with the sample light beam S, detecting the sample and probe light beams S, P with a detector device (40), and providing a spectral response of the at least one particle (3), wherein the light source device (10) comprises at least one broadband source, which has an emission spectrum covering a mid-infrared MIR frequency range, and the phase modulator device (20) varies the relative phase with a scanning period equal to or below the irradiation period of irradiating the at least one particle (3, 4).

Abstract: An interferometer apparatus includes a beam splitter arranged for splitting an input beam into a first beam propagating along a first interferometer arm including a deflection mirror and a second beam propagating along a second interferometer arm including a deflection mirror. The first and second interferometer arms have an identical optical path length. A beam combiner is arranged for recombining the first and second beams into a constructive output and a destructive output. In the first interferometer arm compared with the second interferometer arm, one additional Fresnel reflection at an optically dense medium is provided and a propagation of the electromagnetic fields of the first and second beams, when recombined by the beam combiner, results in a wavelength-independent phase difference of ? between the contributions of the two interferometer arms to the destructive output. Furthermore, an interferometric measurement apparatus and an interferometric measurement method are described.

Abstract: A multiple frequency comb source apparatus (100) for simultaneously creating a first laser pulse sequence representing a first frequency comb (1) and at least one further laser pulse sequence representing at least one further frequency comb (2), wherein at least two of the first and at least one further pulse sequences have different repetition frequencies, comprises a laser resonator device (10) comprising multiple resonator mirrors including first end mirrors EM1,OC1 providing a first laser resonator (11), a laser gain medium (21, 22) being arranged in the laser resonator device (10), and a pump device (30) being arranged for pumping the laser gain medium (21), wherein the laser resonator device (10) is configured for creating the first and at least one further laser pulse sequences by pumping and passively mode-locking the laser gain medium (21), the resonator minors of the laser resonator device (10) include further end minors EM2, OC2 providing at least one further laser resonator (12), the first laser r

Abstract: A method of measuring a polarization response of a sample (1), in particular a biological sample, comprises the steps of generating a sequence of excitation waves (2), irradiating the sample (1) with the sequence of excitation waves (2), including an interaction of the excitation waves (2) with the sample (1), so that a sequence of sample waves (3) is generated each including a superposition of a sample main pulse and a sample global molecular fingerprint (GMF) wave (EGMF(sample)(t)), irradiating a reference sample (1A) with the sequence of excitation waves (2), including an interaction of the excitation waves (2) with the reference sample (1A), so that a sequence of reference waves (3A) is generated each including a superposition of a reference main pulse and a reference GMF wave (EGMF(ref)(t)), optically separating a difference of the sample waves (3) and reference waves (3A) from GMF wave contributions which are common to both of the sample waves (3) and reference waves (3A) in space and/or time, and detec

Abstract: A particle analysis method and apparatus, including a spectrometry-based analysis of a fluid sample (1), comprises the steps of creating a sample light beam S and a probe light beam P with a light source device (10) and periodically varying a relative phase between the sample and probe light beams S, P with a phase modulator device (20), irradiating the fluid sample (1) with the sample light beam S, detecting the sample and probe light beams S, P with a detector device (40), and providing a spectral response of the at least one particle (3), wherein the light source device (10) comprises at least one broadband source, which has an emission spectrum covering a mid-infrared MIR frequency range, and the phase modulator device (20) varies the relative phase with a scanning period equal to or below the irradiation period of irradiating the at least one particle (3, 4).

Abstract: An interferometer apparatus for an achromatic interferometric superposition of electromagnetic fields, with a dual beam path interferometer, comprises a beam splitter being arranged for splitting an input beam into a first beam propagating along a first interferometer arm (A1) including at least one deflection mirror and a second beam propagating along a second interferometer arm (A2) including at least one deflection mirror, wherein the first and second interferometer arms have an identical optical path length, and a beam combiner being arranged for recombining the first and second beams into a constructive output and a destructive output, wherein reflective surfaces of the beam splitter and the beam combiner are arranged such that, in the first interferometer arm compared with the second interferometer arm, one additional Fresnel reflection at an optically dense medium is provided and a propagation of the electromagnetic fields of the first and second beams, when recombined by the beam combiner, results in

Abstract: A laser device (100), being configured for generating laser pulses by Ken lens based mode locking, comprises a laser resonator (10) with a plurality of resonator mirrors (11.1, 11.2, 11.

Abstract: A pulse laser apparatus (100) for creating laser pulses (1), in particular soliton laser pulses (1), based on Kerr lens mode locking of a circulating light field in an oscillator cavity (10), comprises at least two resonator mirrors (11, 12, . . .

Abstract: A pulse laser apparatus (100) for creating laser pulses (1), in particular soliton laser pulses (1), based on Kerr lens mode locking of a circulating light field in an oscillator cavity (10), comprises at least two resonator mirrors (11, 12, . . .

Abstract: A method of measuring a polarization response of a sample (1), in particular a biological sample, comprises the steps of generating a sequence of excitation waves (2), irradiating the sample (1) with the sequence of excitation waves (2), including an interaction of the excitation waves (2) with the sample (1), so that a sequence of sample waves (3) is generated each including a superposition of a sample main pulse and a sample global molecular fmgerprint (GMF) wave (EGMF(sample)(t)), irradiating a reference sample (1A) with the sequence of excitation waves (2), including an interaction of the excitation waves (2) with the reference sample (1A), so that a sequence of reference waves (3A) is generated each including a superposition of a reference main pulse and a reference GMF wave (EGMF(ref)(t)), optically separating a difference of the sample waves (3) and reference waves (3A) from GMF wave contributions which are common to both of the sample waves (3) and reference waves (3A) in space and/or time, and detect

Abstract: A pulse light source device (100) for creating fs output laser pulses (1, 1.1, 1.2, 1.3) having CEP stability comprises a pulse source device (10) creating primary ps laser pulses, a first beam splitting device (13) splitting the primary ps laser pulses to first ps laser pulses (2.1) and second ps laser pulses (2.2), a pulse shortening device (20) creating sub-ps laser pulses (3) by shortening and spectrally broadening the first ps laser pulses (2.1), a primary supercontinuum generation device (30) creating primary fs laser pulses (4), a pulse stretcher device (40) creating stretched ps laser pulses (5, 5.1) by stretching the primary fs laser pulses (4), a optical parametric chirped-pulse amplification device (51) creating amplified ps laser pulses (6, 6.1) on the basis of the stretched ps laser pulses (5, 5.1) and the second ps laser pulses (2.2); a phase stabilization device (61) creating CEP stable ps laser pulses (7, 7.1) by difference frequency generation of the amplified ps laser pulses (6, 6.

Abstract: A pulse light source device (100) for creating fs output laser pulses (1, 1.1, 1.2, 1.3) having CEP stability comprises a pulse source device (10) creating primary ps laser pulses, a first beam splitting device (13) splitting the primary ps laser pulses to first ps laser pulses (2.1) and second ps laser pulses (2.2), a pulse shortening device (20) creating sub-ps laser pulses (3) by shortening and spectrally broadening the first ps laser pulses (2.1), a primary supercontinuum generation device (30) creating primary fs laser pulses (4), a pulse stretcher device (40) creating stretched ps laser pulses (5, 5.1) by stretching the primary fs laser pulses (4), a optical parametric chirped-pulse amplification device (51) creating amplified ps laser pulses (6, 6.1) on the basis of the stretched ps laser pulses (5, 5.1) and the second ps laser pulses (2.2); a phase stabilization device (61) creating CEP stable ps laser pulses (7, 7.1) by difference frequency generation of the amplified ps laser pulses (6, 6.