Impingement cooling devices for a laser disk include a carrier plate on the front side of which the laser disk can be secured, and a supporting structure, on the front side of which the rear side of the carrier plate is secured. The supporting structure has a plurality of cooling liquid feed lines from which the cooling liquid emerges in the direction of the rear side of the carrier plate and a plurality of cooling liquid return lines. The feed and return lines run parallel to one another in the longitudinal direction of the supporting structure, and the supporting structure includes a plurality of cutouts or the rear side of the carrier plate that are open toward the supporting structure, and the cooling liquid feed lines lead into and the cooling liquid return lines lead away from the plurality of cutouts.

A diode-pumped solid state laser system and a method of diode-pumping a solid state laser in which the emitter beamlets in the diode bar are directed at a beam transformation optical element which includes a continuous twisted surface to produce a uniform and symmetrised beam in the fast field which is then focused to match an input pump area of the gain medium of the solid state laser. Embodiments to square and rectangular flat-top intensity distributions are described using a Fourier lens and a set of cylindrical orthogonal lenses.

The invention relates to a LASER amplification module for a solid-state laser system and method for manufacturing thereof. The present invention relates to a laser amplification module for a solid-state laser. More particularly, the present invention relates to the module amplifying laser beam capable to provide effective cooling of a heat sink bonded to a solid-state disk. The monolithic laser amplification module (1) comprises a solid-state disk (2); a monolithic composite (6) comprising a heat sink (3) and a reflecting coating (4) configured to at least partially reflect an incident beam (5) propagated in the solid-state disk (2) in a wavelength range λ from 200 nm-10 μm, wherein the reflecting coating (4) is deposited on surface of the heat sink by a deposition method, wherein the heat sink (3) has: transverse thermal conductivity at least 100 W/m*K, Young's modulus at least 100 GPa, preferably at least 300 GPa; and thickness of the heat sink at least 1 mm, preferably at least 2 mm; and wherein the solid-state disk and the monolithic composite have surfaces (61 and 21) having PV-flatness<210 nm and have a surface roughness RMS<2 nm; and wherein the surfaces (21 and 61) of the solid-state disk (2) and the monolithic composite (6) are directly and permanently bonded together.

A fluid-cooled laser amplifier module (100) is disclosed which comprises: a casing; a plurality of slabs (110) of optical gain medium oriented in parallel in the casing for cooling by a fluid stream (154, 156); a polarisation rotator (120) disposed between a first group of one or more slabs (111) of the optical gain medium and a second group of one or more slabs (112) of the optical gain medium; optical windows (150, 152) for receiving an input beam or pulse (130) for amplifying by the slabs and for outputting the amplified beam or pulse (140); and fluid stream ports (155, 157) for receiving and discharging the fluid stream for cooling the slabs.

A disk resonator is pumped by counterpropagating pump signals to produce corresponding counterpropagating Brillouin laser signals. The pump laser optical frequencies are separated by a frequency offset Δν.sub.P but excite the same nominal resonator optical mode; the Brillouin laser optical frequencies are separated by a beat frequency Δν.sub.L with 0<Δν.sub.L<Δν.sub.P. A photodetector receives the Brillouin laser signals and produces an electrical signal at the beat frequency Δν.sub.L. The frequency offset Δν.sub.P can be large so enough to prevent locking of the Brillouin laser signals onto a common Brillouin laser frequency. A signal processing system derives from the beat frequency Δν.sub.L an estimated angular velocity component of the disk optical resonator about an axis substantially perpendicular to the disk optical resonator.

A solid state laser apparatus includes a plurality of cold heads, a cooling apparatus, laser media and a seed light source. The cooling apparatus is configured to cool the plurality of cold heads. The laser media are arranged in contact with each of the plurality of cold heads, and configured to amplify a first laser beam and reflect the first laser beam. The seed light source is configured to irradiate a first laser medium of the laser media with the first laser beam. The first laser medium is arranged on a first of the cold heads. The laser media are configured to reflect the first laser beam irradiated to the first laser medium to a second laser medium of the laser media. The second laser medium is arranged on a second of the cold heads. The cold heads are configured to cool the laser media.

A method generates laser pulses by varying a Q-factor in a resonator. The method includes generating the laser pulses by controlling an optical modulator with a control signal for switching over between a first operating state of the optical modulator for generating a first Q-factor in the resonator and a second operating state of the optical modulator for generating a second Q-factor in the resonator. The second Q-factor is different than the first Q-factor. In order to generate a sequence of the laser pulses in which first laser pulses alternate with second laser pulses different than the first laser pulses, the optical modulator is controlled differently in each case alternately with the control signal for generating a respective first laser pulse, of the first laser pulses, and a respective second laser pulse, of the second laser pulses.

An amplifier arrangement for increasing power and energy includes a multipass cell and at least one gain medium, wherein the multipass cell has concavely curved mirrors and the gain medium is arranged within the multipass cell in such a way that the pump radiation passes through the gain medium multiple times and is absorbed by the gain medium and wherein a laser beam to be amplified passes through the gain medium, characterized in that the mirrors are designed and arranged such that a White multipass cell is formed and the pump radiation and the laser beam to be amplified have large cross-sections at the positions at which mirrors, gain media and other optical components are arranged.

A quasi-monolithic solid-state laser in which the optical components of the laser cavity are bonded to a common substrate via mounts. The optical components and their mounts are fixedly connected to each other and to the substrate by bonding. While the gain medium is bonded to a mount made of a different material with high thermal conductivity for heat sinking, the cavity's lens and mirror components and their mounts are all made of the same material as the substrate, or a different material that is thermally matched to the substrate, and fixedly mounted on the substrate solely with bonding. The bonding is achieved with adhesive bonding, or some other form of bonding such as molecular bonding, chemically activated direct bonding or hydroxide catalysis bonding.

A laser device is provided that includes an element made of laser-active material and a cladding element bonded to the element so as to allow heat exchange by heat conduction between the cladding element and the element. The laser-active material emitting laser light when excited by pump light. The element being made of a glass. The cladding element being made of a material that exhibits an absorption coefficient for the pump light that is lower than a corresponding absorption coefficient of the glass. The element and cladding element being configured so that the pump light can be directed through the cladding element into the element and/or so that the pump light can be directed through the element into the cladding element.