A tunable narrow-linewidth single-frequency linear-polarization laser device comprising a heat sink, a pumping source packaged on the heat sink, a first and second collimating lenses, a laser back cavity mirror, a thermal optical tunable filter, a rare-earth-ion heavily-doped multicomponent glass optical fiber, a super-structure polarization-maintaining fiber grating, a polarization-maintaining optical isolator, a polarization-maintaining optical fiber, and a thermoelectric refrigerating machine. The laser device uses a short and straight single-frequency resonant cavity structure, the heavily-doped and high-gain characteristics of the multicomponent glass optical fiber, a frequency selection role and wavelength tuning function of the thermal optical tunable filter and the superstructure polarization-maintaining fiber grating, and combines a precision temperature adjustment technology, and by means of real-time adjustment of distribution of reflection wavelengths and transmission wavelengths, the laser device changes spectrum peak overlapping positions, so as to implement stable output of wide-tuning-range, extra-narrow-linewidth, high-extinction-ratio and high-output-power continuously tunable single-frequency linear-polarization laser.

An apparatus includes a heat exchanger with a body having a passage through the body. The passage defines apertures on multiple sides of the body, and the passage is configured to allow optical signals to pass through the body. One or more tapered edges are at least partially around one or more of the apertures, and each tapered edge is configured to reflect optical radiation inward into the passage. One or more absorptive surfaces are within the passage, and the one or more absorptive surfaces configured to absorb the reflected optical radiation. The heat exchanger is configured to convert the absorbed optical radiation into heat, and the body further includes one or more cooling channels configured to receive coolant that absorbs the heat.

A method and device for limiting the deflection of a laser head during temperature changes such that a laser head is usable in applications of laser technology.

A laser amplifier head is provided. The laser amplifier head includes a plurality of plates of a solid-state laser active medium disposed in a housing, arranged parallel to one another with their main surfaces facing one another, the housing being provided with an inlet port and an outlet port for a cooling liquid, and also at least one window allowing a laser beam to pass through the laser active medium plates, wherein it also includes: a mechanical connection device allowing a cyclic movement at least of the laser active medium plates in relation to the laser beam in a plane (xy) perpendicular to the direction (z) of their thickness; and cooling liquid guide plates arranged in the extension of the laser active medium plates, between the latter and the inlet port of said liquid.

A device for generating laser radiation comprises a temperature-controlled optical setup comprising an optically non-linear solid state medium arranged in a resonator and an active region. The outgoing laser radiation is generated from a pump beam introduced into the optically non-linear solid state medium. A first temperature actuator and a second temperature actuator configured to independently adjust temperature values in the active region of the optically non-linear solid state medium. The first temperature actuator is configured regulate a length of the resonator by setting a first temperature value within a first portion of the active region. The second temperature actuator is configured to match phases of wavelengths generated by the outgoing laser radiation and phases of wavelengths of the pump beam radiation by setting a second temperature value within a second portion of the active region.

An arrangement monitors an optical element. The arrangement includes: a light source configured to emit radiation onto a surface of the optical element; a detector configured to detect the radiation that has been at least partially reflected at the surface of the optical element; and a holder for the optical element, in which the light source and the detector are integrated. The holder has a cooling region through which a cooling liquid is configured to flow, the cooling region being in contact with the optical element. The holder has a reservoir, through which a beam path between the light source and the detector extends. The reservoir is configured to receive the cooling liquid leaking out at the optical element in case of a leakage.

An optical system element includes a first enclosure designed for receiving in circulation a functional fluid and at least one inlet and/or outlet window located on the first enclosure and through which a light beam can pass. The inlet and/or outlet window includes two viewports which delimit a spacer cavity adjacent to the first enclosure. The spacer cavity is designed to receive a second fluid with a predetermined optical index and is equipped with a device for adjusting the pressure therein. Degradation of a beam during its passage through the inlet and/or outlet window can be limited by careful selection of the optical index of the second fluid and the pressure in the spacer cavity.

An arrangement monitors an optical element. The arrangement includes: a light source configured to emit radiation onto a surface of the optical element; a detector configured to detect the radiation that has been at least partially reflected at the surface of the optical element; and a holder for the optical element, in which the light source and the detector are integrated. The holder has a cooling region through which a cooling liquid is configured to flow, the cooling region being in contact with the optical element. The holder has a reservoir, through which a beam path between the light source and the detector extends. The reservoir is configured to receive the cooling liquid leaking out at the optical element in case of a leakage.

In various embodiments, laser resonator modules produce output beams via manipulation of input beams on opposite sides of the module. The input beams are emitted by one or more beam emitters that may be cooled using a liquid coolant cavity. The liquid coolant cavity may be isolated from optical elements utilized to manipulate the input beams, at least in part, by an isolation wall protruding from the base plate of the resonator module.

Provided is a laser device in which: a laser medium doped with ytterbium emits light upon absorption of excitation light; the light emitted by the laser medium is amplified to obtain output light; and the output light is outputted in the form of a plurality of pulses. In the laser device, a spatial filter is disposed in the optical path of the light emitted by the laser medium or is disposed in the optical path of the output light outputted from an optical resonator, the spatial filter being configured to filter out a portion of the light or of the output light around the optical axis.