Passively Q-switched lasers and short wave infrared (SWIR) electro-optical systems including such lasers. A passively Q-switched laser may include a gain medium (GM) having a stimulated emission cross section σ.sub.SE, a saturable absorber (SA) having an absorption cross section (σ.sub.a) which is less than three times the σ.sub.SE of the GM, and an optical resonator within which the GM and the SA are positioned, the optical resonator comprising a high reflectivity mirror and an output coupler, wherein at least one of the high reflectivity mirror and the output coupler comprises a curved mirror, directing light within the optical resonator such that an effective cross-section of a laser mode within the SA (A.sub.SA) is smaller than a cross-section of a laser mode within a Rayleigh length of the pump (A.sub.GM).

A laser-oscillation cooling device includes a laser excitation unit that excites a laser beam and locally emits heat, a storage tank that is capable of storing a cryogenic liquid at an atmospheric pressure and discharge the cryogenic liquid which is evaporated, a pressurization and supply unit that pressurizes the cryogenic liquid stored in the storage tank and supplies the pressurized cryogenic liquid to the laser excitation unit, and a decompression and return unit that decompresses the cryogenic liquid which is supplied to the laser excitation unit and used to cool the laser excitation unit and returns the cryogenic liquid to the storage tank.

A laser-oscillation cooling device includes a laser excitation unit that excites a laser beam and locally emits heat, a storage tank that is capable of storing a cryogenic liquid at an atmospheric pressure and discharge the cryogenic liquid which is evaporated, a pressurization and supply unit that pressurizes the cryogenic liquid stored in the storage tank and supplies the pressurized cryogenic liquid to the laser excitation unit, and a decompression and return unit that decompresses the cryogenic liquid which is supplied to the laser excitation unit and used to cool the laser excitation unit and returns the cryogenic liquid to the storage tank.

The laser amplification apparatus is provided with a plurality of plate-shaped laser medium components (M1 to M4) which are disposed to be aligned along a thickness direction, and prisms (P1 to P3) which optically couples the laser medium components. Each of the laser medium components is provided with a main surface to which a seed light is incident, and a side surface which surrounds the main surface. An excitation light is incident from at least one side surface of a specific laser medium component among the plurality of laser medium components. The excitation light is incident through the prism to a side surface of the laser medium component adjacent to the prism.

The laser amplification apparatus is provided with a plurality of plate-shaped laser medium components (M1 to M4) which are disposed to be aligned along a thickness direction, and prisms (P1 to P3) which optically couples the laser medium components. Each of the laser medium components is provided with a main surface to which a seed light is incident, and a side surface which surrounds the main surface. An excitation light is incident from at least one side surface of a specific laser medium component among the plurality of laser medium components. The excitation light is incident through the prism to a side surface of the laser medium component adjacent to the prism.

A light emitting device includes: a plurality of light emitting elements that are aligned in a first direction; and a base that includes a plurality of mounting surfaces that are aligned in the first direction and on which the respective light emitting elements are mounted; a bottom surface that extends in a second direction that is inclined with respect to the first direction on back sides of the plurality of mounting surfaces; and a refrigerant passage that is arranged between the plurality of mounting surfaces and the bottom surface and in which a refrigerant flows, the refrigerant passage including a first section that extends in the first direction along the plurality of light emitting elements.

A light emitting device includes: a plurality of light emitting elements that are aligned in a first direction; and a base that includes a plurality of mounting surfaces that are aligned in the first direction and on which the respective light emitting elements are mounted; a bottom surface that extends in a second direction that is inclined with respect to the first direction on back sides of the plurality of mounting surfaces; and a refrigerant passage that is arranged between the plurality of mounting surfaces and the bottom surface and in which a refrigerant flows, the refrigerant passage including a first section that extends in the first direction along the plurality of light emitting elements.

The present invention relates generally to high brightness optical fiber systems and, more particularly to optical fiber systems 104 having an optical power module 151 remote from an initial amplifier stage 101. In one aspect of the invention, the optical fiber system comprises a first active optical fiber 102 operatively coupled to one or more first pump sources 104; a first signal optical fiber 110 coupled to the first active optical fiber 102; one or more final pump sources 120; one or more final pump optical fibers 130, coupled to one or more of the final pump sources 120; and spatially separated from the one or more final pump sources 120 and the initial amplifier stage 101 comprising the first active optical fiber 102, a power module 151, comprising a final active optical fiber 150, coupled to the first signal optical fiber 110, said final active optical fiber 150 being coupled to said one or more final pump optical fibers 130.

A radial polarization disk laser, including a pumping source, a collimator lens, a focusing lens, a laser gain medium, a Brewster axial cone, and a output lens, which are sequentially arranged along a laser light path. An angle formed between the conical surface and the bottom surface of said Brewster axial cone is a Brewster's angle. Said laser gain medium is bonded with said bottom surface; said laser gain medium and said output lens form a laser harmonic oscillator cavity therebetween. The pumped laser light emitted by said pumping source passes through said collimator lens and said focusing lens, then is focused on the laser gain medium, and. the generated photons oscillate in said laser harmonic oscillator cavity, and then a radial polarized laser beam is finally output by said output lens.

This disclosure relates to pumping light systems and methods for using a disc laser. A focusing device with a reflecting surface focuses a pumping light beam onto a laser-active medium. A deflecting system deflects the pumping light beam between reflecting regions formed on the reflecting surface that are arranged in different angle regions around a central axis of the reflecting surface in at least a first annular region and a second annular region. The deflecting systems are configured to perform at least one deflection of the pumping light beam between two reflecting regions of the first annular region and at least one deflection between two reflecting regions of the second annular region.