A light-emitting device includes an optical amplifier and gives off output light from optical amplifier by making a plurality of seed light rays, having mutually different wavelengths, incident on optical amplifier. Optical amplifier includes a medium portion containing a wavelength-converting element. Optical amplifier has wavelength-converting element thereof excited by excitation light to produce a plurality of partially coherent light rays, of which wavelengths are respectively the same as the mutually different wavelengths of plurality of seed light rays, thereby giving off, as output light, a multi-wavelength light beam. Excitation light has a shorter wavelength than any of plurality of seed light rays and is incident on the medium portion. Multi-wavelength light beam includes a plurality of light rays amplified. Plurality of light rays amplified have wavelengths, which are respectively the same as mutually different wavelengths of plurality of seed light rays.

A laser light source unit for vehicles is provided, having a resonator containing a first end mirror and a second end mirror and an active laser medium in between. The laser light source unit has a pump device for generating a pump radiation into the resonator. The pump radiation is configured such that laser light of the first wavelength, a second wavelength, and/or a third wavelength can be radiated. An intermediate mirror is configured so that the radiation of the second wavelength is reflected, and the radiation of the third wavelength is transmitted. A third end mirror is configured so that the radiation of the second wavelength is reflected. A color control module acts on the radiation of the second wavelength and/or the third wavelength so that an intensity of the stimulated emission of the radiation of the second wavelength is adjusted to the radiation of the third wavelength.

To provide a mode-locked pulse photoproduction filter for easily realizing self-starting mode-locking, and a laser device for generating a picosecond or femtosecond-pulse laser light by including such filter, the laser device including an amplifying unit for amplifying and outputting a light inside a resonator, and the mode-locked pulse photoproduction filter having a first filter part for selectively outputting a first wavelength component that is a wavelength component of an oscillation band inside the resonator, and a second filter part for selectively outputting a second wavelength component that is a wavelength component different from the oscillation band inside the resonator.

An electrically tunable non-reciprocal phase shifter, an electrically tunable polarization filter, a NALM mode-locked laser and a Sagnac loop are provided. The electrically tunable non-reciprocal phase shifter includes a modulation crystal device, a birefringent crystal device, a Faraday rotator, and a fiber coupler. The phase shifter is configured to couple two beams of light to a fast axis and a slow axis of the modulation crystal device, respectively; and change a refractive index difference between the fast axis and the slow axis to introduce different phase delays for the two beams of the light, so as to control a non-reciprocal linear phase shift amount between the two beams of the light.

An optical processing apparatus, an optical processing method, and an optically-processed product production method. The optical processing apparatus and the optical processing method includes emitting a first process light to a focal point set inside an object to be processed, using a first light-emitting unit, and emitting a second process light during a period of time in which plasma or gas is generated inside the object to be processed, by the first process light, using a second light-emitting unit. The processed product production method includes emitting a first process light to a focal point set inside an object to be processed, using a first light-emitting unit, and emitting a second process light during a period in which plasma or gas is generated inside the object to be processed by the first process light, using a second light-emitting unit.

An EHz ultrafast modulated pulse scanning laser and a distributed fiber sensing system. A plurality of phase-shift gratings are engraved on a doped fiber, the phase-shift gratings having different central window wavelengths and a wavelength interval between the adjacent central window wavelengths being a preset fixed value. When a pump light emitted by a pump laser source is coupled by a wavelength division multiplexer and enters the doped fiber, a single-mode narrow-linewidth laser light having multiple wavelengths with a wavelength interval being a preset fixed value can be generated, by using the phase-shift gratings graved on the doped fiber. The ultrafast modulation is completed by using a time-domain control method based on an EOM. An internally frequency converted pulse light formed by splicing pulse lights whose frequencies linearly increase is obtained, thus forming the EHz ultrafast modulation of a distributed feedback fiber laser. In this way, a coherence length of an output laser light is increased while a frequency of the laser light is remained.

In various embodiments, a beam-parameter adjustment system and focusing system alters a spatial power distribution of a radiation beams before the beam is coupled into an optical fiber or delivered to a workpiece.

An amplified laser device is provided with one or more Micro-Electro-Mechanical System (MEMS) Micro-Mirror Arrays (MMAs) having tip, tilt and piston capability positioned on either side of the optical amplifier to correct the profile of the beam to improve the gain performance of the optical amplifier or to compensate for atmospheric distortion while steering the amplified beam over a FOR. The MEMS MMAs may be positioned in front of, behind or on both sides of the amplifier. The MEMS MMAs can be configured to optimize the combined amplifier performance, static and time varying, and compensation for atmospheric distortion together or separately.

In various embodiments, a laser emitter such as a diode bar is cooled during operation via jets of cooling fluid formed by ports in a cooler on which the laser emitter is positioned. The jets strike an impingement surface of the cooler that is thermally coupled to the laser emitter but prevents direct contact between the cooling fluid and the laser emitter itself.

An ophthalmic illumination system includes a light source to emit a light beam and a filter comprising a clear region to transmit visible light in the visible spectrum and a first filtered region to transmit visible light in a first spectral range. The filter is arranged within the optical path of the beam. The system includes a plurality of chromaticity sensors to receive a portion of the light beam transmitted by the filter and output a signal indicating chromaticity of the received beam. The system also includes a processor to receive the signal indicating chromaticity, compare the indicated chromaticity to a target chromaticity stored in memory and, based on the comparison, adjust the chromaticity of the light beam transmitted by the filter by generating a signal to move the filter from a first position in which the light beam is incident upon only the clear region to a second position in which the light beam is partially incident on both the clear region and the first filtered region.