The technology described in this document can be used to implement an optical device including a seed pump laser to produce pump seed laser pulses at a pump wavelength, a pulse stretcher operable to stretch a pulse duration of the pump seed laser pulses to produce stretched pump seed laser pulses, a pump fiber amplifier including one or more fiber gain media to receive the seed pump laser pulses to produce a pump laser beam of pump laser pulses, a signal laser to produce a signal laser beam at a signal wavelength different from the pump wavelength, an optical module coupled to combine the pump laser beam and the signal laser beam, and a fiber optical parametric amplifier (OPA) to cause a nonlinear parametric interaction in the nonlinear fiber medium to produce an output signal beam, an output idler laser beam at an idler wavelength, and an output pump beam.

A laser oscillation device includes a laser oscillation unit, which is a laser oscillation part that generates multiple first laser beams having different wavelengths from one another, multiple sensors having different sensitivity characteristics from one another each representing light-receiving sensitivity for the wavelengths of the multiple first laser beams, to each output first voltages dependent on outputs of the multiple first laser beams. The laser oscillation device includes a computing unit that corrects the multiple first voltages using the sensitivity characteristics of the multiple sensors, and controls the laser oscillation unit based on multiple second voltages which correspond to multiple first voltages obtained after the correction.

A micro disk laser having a greater strength of oscillation in one direction than in another direction and unidirectionally oscillating includes a micro disk having an oval shape corresponding to a modified ellipse obtained by changing a length of a short axis of an ellipse according to a position of a long axis while lengths of first and second side portions of the long axis are fixed in the ellipse, the ellipse having the long axis and the short axis having a different length than the long axis.

A multiple wavelength laser processing system is configured with a multiple wavelength laser source for generating a multiple wavelength coaxial laser processing beam. The laser processing system further includes a multiple wavelength optical system to deliver the coaxial laser processing beam to a laser-material interaction zone on the surface of a workpiece such that each of the a first and a second laser wavelengths in the processing beam impinge at least a portion of the interaction zone as respective first and second concentric laser spots. The multiple wavelength optical system includes a multiple wavelength beam collimator, a configurable chromatic optic, and a laser processing focus lens, wherein the configurable chromatic optic provides an adjustment to the relative focus distance of the first and second laser wavelengths.

A spectroscopic analysis apparatus includes a laser light source that emits laser light, of which wavelength changes, toward a reflector inside a probe, the probe being configured to be disposed in a flow passage of a measurement target fluid, a light receiver that receives the laser light reflected by the reflector, and a controller that analyzes the measurement target fluid using a result of reception acquired by the light receiver and controlling the laser light source. The controller controls the laser light source to perform at least one scan of the laser light, the controller controlling the laser light source such that a scanning time of the laser light is equal to or shorter than a light-receivable time of the laser, the scanning time being a time to scan the laser light emitted from the laser light source in a certain wavelength range, the light-receivable time being a time in which the laser light reflected by the reflector can be received by the light receiver.

In one aspect, an optical system for delivering light into an optical fiber is disclosed, which comprises a phosphor-converted white light source for generating white light, a red light emitting diode (LED) for generating red light, and a light-delivery system for delivering at least a portion of said white light and said red light into an input port of an optical fiber.

A laser oscillator includes: an external resonator configured to include laser media to emit laser beams having different wavelengths; and a partially reflective mirror to transmit part of the laser beams and reflect and return a remainder toward the laser media. The external resonator includes therein: a diffraction grating to perform wavelength coupling on the laser beams having different wavelengths emitted from the laser media so as to superimpose the laser beams into one laser beam and to emit, to the partially reflective mirror, the one laser beam; and a prism that is placed between the laser media and the diffraction grating and that superimposes the laser beams into one laser beam on the diffraction grating, the prism including two surfaces forming an apex angle, one of the two surfaces being an incident surface and another of the two surfaces being an exit surface.

Systems and methods are provided for optimizing the energy output of a laser system, such as a Light Detection and Ranging (LIDAR) system, by allowing the laser system to be tuned while the laser is in operation. For example, in an embodiment, a sensor, such as a photoresistor, is used to perform a scan to determine whether turning the crystal will result in increased energy. Crystal turners, such as servo motors, can be used to turn the crystal until the energy stops increasing.

A laser light source unit for vehicles is provided, having a resonator containing a first end mirror and a second end mirror. Between the two, an active laser medium is arranged. The laser light source unit further has a pump device for generating a pump radiation which can be introduced via the first end mirror into the resonator. The pump radiation corresponds to a first wavelength and the active laser medium is configured such that laser light of the first wavelength and/or of a second wavelength and/or of a third wavelength can be radiated. An intermediate mirror and a third end mirror assigned to the same are provided. The intermediate mirror is configured in such a way that the radiation of the second wavelength is reflected, and the radiation of the third wavelength is transmitted, by means of said intermediate mirror. The third end mirror is configured in such a way that the radiation of the second wavelength is reflected, a color control module is provided, which acts on the radiation of the second wavelength and/or the radiation of the third wavelength in such a way that an intensity of the stimulated emission of the radiation of the second wavelength is adjusted to the radiation of the third wavelength, or vice versa.

A method for locking repetition rate of an optical frequency comb is provided. A cavity length adjusting actuator is adopted to lock the repetition rate of the optical frequency comb. When a locking state of the cavity length adjusting actuator is in a critical threshold state, an optical delay line of an optical frequency comb optical system is adjusted to adjust the repetition rate of the optical frequency comb, so as to keep locking the repetition rate of the optical frequency comb. A locking device of the repetition rate is also provided, in which an optical delay line control system can judge the locking state of a cavity length adjusting actuator control system in real time, such that the repetition rate can be slowly adjusted within a wide range, and the locking state of the optical frequency comb can be maintained.