E A Perevezentsev

Fabrication of composite laser elements by a new thermal diffusion bonding method

A new method of thermal diffusion bonding of different garnet crystals is proposed. Its main advantage is simplicity and low cost: not very stringent requirements to the quality of surface, muffle furnace without press is sufficient. The proposed method enables fabricating composites of YAG, Yb:YAG, Yb:GGG, and TGG crystals with an aperture up to 20 mm and optical contact whose mechanical strength is comparable with that of monocrystals and reflection coefficient at the boundary is close to the Fresnel one.

Comparison of composite and disk shaped active elements for pulsed lasers

Characteristics of active elements with different geometry have been compared theoretically. The possibility to reduce thermally the induced distortions of laser radiation and to increase the stored energy in a disk laser with a composite active element at room and cryogenic temperatures has been investigated

Sub-joule level high repetition rate cryogenic disk laser

Spectral and thermooptical properties, the stored energy and amplification in Yb: YAG disks are investigated at 77-300K temperature range. The current status of the laser system development with 0.5J output energy at 1kHz repetition rate is presented.

High power CPA cryogenic Yb:YAG laser

For a several femtosecond pulse OPCPA amplification several picosecond pump is required. To develop such pump a laser system for a stretched picosecond pulse amplification is created in the Institute of Applied Physics RAS. It is then planned to prepare for the integration of a femtosecond seed laser with the cryogenic amplifier.

Front-end system for few circle OPCPA amplification

A front-end laser system with optical synchronization is developed for OPCPA amplification. A pulse duration in femtosecond part is less than 35 fs and this signal may be compressed to few circle duration. The signal in pump part is amplified to 0.1 mJ for further developing of high energy pump laser based on Yb:YAG disks.

High power cryogenic Yb:YAG disk laser with nanosecond output pulse duration

OPCPA amplification of pulses that are several femtosecond order of magnitude requires pumping with picosecond pulses. For a simulation of such pump a laser system for a stretched picosecond pulse amplification has been created in the Institute of Applied Physics RAS: seed laser has been upgraded, a new high average power active cooling cryogenic disk laser head has been developed. New Main amplifier scheme based on this laser heads has been created.

Features of amplification and stored Energy in cryogenic Yb:YAG disk laser with sub-Joule energy level

Methods of reduction of amplified spontaneous emission were investigated in cryogenically cooled Yb:YAG disks. The disk with undoped cap is more suitable as active element for cryogenic laser with sub-joule energy at high repetition rate