Olga Vadimova

Thermal Effects in End-Pumped Yb:YAG Thin-Disk and Yb:YAG/YAG Composite Active Element

The small signal gain and phase and polarization distortions of laser radiation have been investigated theoretically and experimentally in end-pumped Yb:YAG thin-disk and Yb:YAG/YAG composite active element under nonlasing conditions. Comparison of experimental data with calculation results reveals an additional heat release whose negative influence is three times stronger than that of amplified spontaneous emission in the thin-disk active element.

Thermal effects in Yb:YAG single-crystal thin-rod amplifier.

This work presents a new design for the laser gain module based on a ytterbium-doped yttrium aluminum garnet (Yb:YAG) single-crystal thin rod. Thermal effects (temperature, phase, and polarization distortion of laser radiation) and small signal gain are investigated both experimentally and theoretically. We then analyzed the influence of thermal effects and amplified spontaneous emission on the power scaling of the laser based on the gain module. A small signal gain as high as 3.3 per pass was experimentally achieved.

Thin-tapered-rod Yb:YAG single-crystal laser amplifier

Thin-tapered-rod single-crystal active element is proposed to use in laser amplifiers. Numerical and experimental investigation of small signal gain in thin-rod and thin-tapered-rod geometries is performed and advantages of thin-tapered-rod active element are shown.

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

Comparison of thermal effects in Yb:YAG disk laser head at room and cryogenic temperature conditions

Theoretical and experimental analysis of small signal gain, phase and polarization distortion of laser radiation in end-pumped Yb:YAG thin disk and composite Yb:YAG/YAG active elements is performed at room and cryogenic temperature under non-lasing conditions.

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.

Thin-rod and thin-tapered-rod ytterbium amplifiers for fiber lasers

Laser amplifiers based on the thin-rod (“single-crystal fiber”) and thin-tapered-rod Yb:YAG active elements are developed and tested. The ability of applying the new broadband Yb-doped materials in the thin-rod geometry is discussed and such active elements will be tested soon.

Specificities of laser pulse amplification in multi-pass amplifiers

The laser pulse amplification was considered with accounting temporal and spatial profiles under various pulse parameters. It was shown that using of multiple passes amplifier allows increasing efficiency and reducing temporal profile distortion. The possible ways to decreasing of temporal profile distortion were considered.

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.

Thin-disk multipass amplifier with composite Yb:YAG/YAG active element

During thin-disk multipass amplifier with composite Yb:YAG/YAG active element development laser head was constructed, thermal-induced phase distortion were investigated, high small signal gain was achieved and numerical simulation of pulse amplification was performed.