A frequency comb laser providing large comb spacing is disclosed. At least one embodiment includes a mode locked waveguide laser system. The mode locked waveguide laser includes a laser cavity having a waveguide, and a dispersion control unit (DCU) in the cavity. The DCU imparts an angular dispersion, group-velocity dispersion (GVD) and a spatial chirp to a beam propagating in the cavity. The DCU is capable of producing net GVD in a range from a positive value to a negative value. In some embodiments a tunable fiber frequency comb system configured as an optical frequency synthesizer is provided. In at least one embodiment a low phase noise micro-wave source may be implemented with a fiber comb laser having a comb spacing greater than about 1 GHz. The laser system is suitable for mass-producible fiber comb sources with large comb spacing and low noise. Applications include high-resolution spectroscopy.

A vertical external cavity surface emitting laser (VECSEL) based system in a linear single cavity configuration is configured to deliver light in higher-order Hermite-Gaussian transverse modes with Watt-level output power. Simultaneous and independent lasing of spatially-restructurable multiple high-order transverse modes that are collinearly-propagating at the output of such laser cavity is facilitated with the use of an optical pumping scheme devised to control positions of location at which the gain medium of the system is pumped (e.g., locations of focal spots of multiple pump beams on the gain-medium chip). An external astigmatic mode converter is utilized to convert such high-order Hermite-Gaussian modes into corresponding Laguerre-Gaussian modes.

A laser amplifier for a green laser pulse includes at least one gain medium doped with praseodymium and at least one gallium nitride based diode laser for pumping the gain medium. A green seed laser pulse going through the gain medium becomes an amplified green laser pulse.

A continuously tunable radio frequency (RF) sensor system is provided. The system includes a pump laser system that includes first and second pump lasers, at least one frequency modulator to modulate frequencies of first and second laser light from the pump lasers to first and second select frequencies, a switch system to selectively pass one of the first and second laser light, an amplifier to amplify the passed laser light, a frequency doubler to double the frequency of the amplified laser light to generate pump light. A laser source lock system is in communication with the pump laser system to ensure a frequency of the pump light is referenced to atoms in a vapor cell and provide a probe light. The pump light and probe light are transmitted through the vapor cell. A detector measures the probe light that passed through the vapor cell.

Embodiments of the present invention relate to methods and apparatus for detecting atmospheric NO at signal levels capable of distinguishing the NO isotopologues. More particularly, embodiments of the present invention relate to methods and apparatus for a single photon LIF sensor that pumps a vibronic transition near 215 nm and observes the resulting red shifted fluorescence from about 255 to about 267 nm. Embodiments of the present system uses a NO-LIF measurement fiber-amplified laser apparatus capable of: generating laser linewidth that is sufficiently narrow to resolve the Doppler broadened NO spectrum at room temperature and thereby achieve high signal levels and distinguish the NO isotopologues; generating laser repetition rate sufficient to enable single-photon counting of the fluorescence signal; and having size, weight and environmental robustness allowing for integration onto airborne platforms.

The invention relates to an apparatus for generating laser pulses. It is an object of the invention to provide a method for generating synchronized laser pulse trains at variable wavelengths (e.g., for coherent Raman spectroscopy/microscopy), wherein the switching time for switching between different wavelengths should be in the sub-μs range. For this purpose the apparatus according to the invention comprises a pump laser (1), which emits pulsed laser radiation at a specified wavelength, an FDML laser (3), which emits continuous wave laser radiation at a cyclically variable wavelength, and a nonlinear conversion medium (4), in which the pulsed laser radiation of the pump laser (1) and the continuous wave laser radiation of the FDML laser (3) are superposed. In the nonlinear conversion medium (4) the pulsed laser radiation of the pump laser (1) and the continuous wave laser radiation of the FDML laser (3) are converted in an optical parametric process into pulsed laser radiation at a signal wavelength and an idler wavelength that differs therefrom. Furthermore the invention relates to a method for generating laser pulses.

The present disclosure provides a laser pulse sequence energy correction system and method. The correction system includes a fundamental frequency light source, a control unit, an energy adjusting unit and a frequency multiplication crystal; the fundamental frequency light source is configured to output a fundamental frequency pulse laser, and the frequency multiplication crystal is configured to convert the fundamental frequency pulse laser into a multiple frequency pulse laser; the control unit prestores an energy-time curve of the multiple frequency pulse laser, and the control unit is configured to control the energy adjusting unit to adjust the intensity of the fundamental frequency pulse laser incident on the frequency multiplication crystal according to the energy-time curve, so that energy of each pulse in the multiple frequency pulse laser is identical. The technical solution of the present disclosure has advantages of simple structure, reliable device, convenient adjustment and the like.

A broadband light source device for creating broadband light pulses includes a hollow-core fiber and a pump laser source device. The hollow-core fiber is configured to create the broadband light pulses by an optical non-linear broadening of pump laser pulses. The hollow-core fiber includes a filling gas, an axial hollow light guiding fiber core configured to support core modes of a guided light field, and an inner fiber structure surrounding the fiber core and configured to support transverse wall modes of the guided light field. The pump laser source device is configured to create and provide the pump laser pulses at an input side of the hollow-core fiber. The transverse wall modes include a fundamental transverse wall mode and second and higher order transverse wall modes.

A laser light source (300), a wavelength conversion light source, a light combining light source, and a projection system. The laser light source comprises a laser element array, a focusing optical element (33), a collimation optical element (34), an integrator rod (36) for receiving and homogenizing a secondary laser beam array (382), an angular distribution control element (35) disposed on the light path between the laser element array and the integrator rod (36) for enlarging the divergence angle of the laser beam array (382) in the direction of the short axis of the light distribution, such that the rate between the divergence angle of each of the secondary laser beam that enters the integrator rod (36) in the direction of the short axis of the light distribution and the divergence angle in the direction of the long axis is greater than or equal to 0.7.

The invention is related to a parametric light generation method and its application and belongs to the technical field of laser and nonlinear optics. The generation method comprises steps as follows: a nonlinear optical material that meets the sum-frequency phase-matched conditions, namely it shall satisfy the energy conservation condition ω.sub.p+ω.sub.i=ω.sub.s and the momentum conservation condition n.sub.pω.sub.p+n.sub.iω.sub.i=n.sub.sω.sub.s simultaneously, is provided; laser light with a wavelength of λ.sub.p is injected into the said nonlinear optical material as pump light; then, the material will output signal light with a wavelength of λ.sub.s, namely the tunable sum-frequency parametric light. With sum-frequency as the basic principle, the invention can realize frequency up-conversion and obtain visible and UV light sources through simple infrared light sources easily.