122 research outputs found
ΠΡΡΠΎΠΊΠΎΠΌΠΎΡΠ½ΡΠΉ Π»Π°Π·Π΅Ρ Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:YAlO3, ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΠΉ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΠΈΠ½Ρ ΡΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ΄ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΡΡ Π·Π΅ΡΠΊΠ°Π» Ρ Π½Π°ΡΡΡΠ°ΡΡΠΈΠΌΡΡ ΠΏΠΎΠ³Π»ΠΎΡΠΈΡΠ΅Π»Π΅ΠΌ
Yttrium aluminium perovskite YAlO3 (YAP) crystal, doped with rare-earth ions, has been extensively studied as a diode-pumped laser host material. The wide interest to rare-earth ions doped YAP crystals is explained by its good thermal and mechanical properties, high natural birefringence, widely used Czochralski growth method. The aim of this work was to study the Yb3+:YAlO3 crystal as an active medium for high power mode-locked laser. Yb3+-doped perovskite-like aluminate crystals have unique spectroscopic and thermooptical properties that allowed using these crystals as an active medium of high power continuous wave (CW) and modelocked (ML) bulk lasers with diode pumping. In our work spectroscopic properties of Yb:YAP crystal and laser characteristics in CW and ML regimes are investigated. Maximum output power of 4 W with optical-to-optical efficiency of 16.3 % and 140 fs pulse duration have been obtained for Yb:YAP E //c-polarization with 10 % output coupler transmittance. Tunability range as wide as 67 nm confirms high promise of using Yb:YAP crystal for lasers working in wide spectral range
Π Π΅Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠ²Π½ΡΠΉ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΠΈΡΠΏΠΈΡΠΎΠ²Π°Π½Π½ΡΡ ΠΈΠΌΠΏΡΠ»ΡΡΠΎΠ² Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:LuAlO3 Ρ ΡΡΠΈΠ»Π΅Π½ΠΈΠ΅ΠΌ ΠΎΡΠ΄Π΅Π»ΡΠ½ΡΡ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΡΡ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π² ΡΠ΅ΡΠ°Π³Π΅ΡΡΠΎΠ²ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠΏΠ΅ΠΊΡΡΠ°
Compact diode-pumped chirped pulse regenerative amplifier systems with pulse repetition rate of hundreds kilohertz based on Yb3+-doped crystals are of practical importance for wide range of applications such as materials processing, medicine, scientific research, etc. The aim of this work was to study the Yb3+:LuAlO3 crystal based dual wavelength chirped pulse regenerative amplifier. Perovskite-like aluminate crystals have unique spectroscopic properties that allowed to use amplifier active element gain spectrum as an amplitude filter for amplified pulse spectrum and even obtained dual wavelength amplification without any additional components. In our work a simple way to obtain dual-wavelength operation of chirped pulse regenerative amplifier by using the active medium gain spectrum as an amplitude filter for the formation of the amplified pulses spectrum demonstrated for the first time to our knowledge. Maximum output power of 5.4 W of chirped pulses (3.8 W after compression) and optical-to-optical efficiency of 22.5 % have been obtained for Yb:LuAP E//b-polarization at 200 kHz repetition rate. Compressed amplified pulse duration was about 708 fs while separate spectral components durations were 643 fs and 536 fs at 1018.3 nm and 1041.1 nm central wavelengths, respectively. Performed investigations show high potential of Yb3+:LuAP crystals as active elements of compact diode pumped chirped pulse regenerative amplifiers
Thermo-optic characterization of Yb:CaGdAlO4 laser crystal
Principal thermo-optic coefficients (TOCs), dno/dT and dne/dT, are measured for Yb:CaGdAlO4 crystal, for the first time, to our knowledge. At the wavelength of ~1 ΞΌm, they equal β7.6 and β8.6 (Π§10-6 K-1), accordingly. Thermal coefficients of the optical path (TCOP) are determined for this crystal for the principal crystal cuts (a-cut and c-cut) and light polarizations (Ο or Ο). Thermo-optic dispersion formulas are evaluated for both TOC and TCOP coefficients. Optical power of thermal lens is measured for diode-pumped a-cut Yb:CaGdAlO4; it is also calculated on the basis of measured material parameters. Thermal conductivity of CaGdAlO4 crystal is measured versus Yb concentration. The results indicate that a-cut Yb:CaGdAlO4 can provide really "athermal" behavior
ΠΠΎΠΌΠΏΠ°ΠΊΡΠ½ΡΠΉ Π»Π°Π·Π΅Ρ Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:LuAlO3 Ρ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠ΅ΠΉ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΠ΅Π·ΠΎΠ½Π°ΡΠΎΡΠ°, ΠΈΠ·Π»ΡΡΠ°ΡΡΠΈΠΉ Π½Π° Π΄Π»ΠΈΠ½Π΅ Π²ΠΎΠ»Π½Ρ 999,6 Π½ΠΌ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π² Π»Π°Π·Π΅ΡΠ½ΠΎ-ΠΈΡΠΊΡΠΎΠ²ΠΎΠΉ ΡΠΌΠΈΡΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ
Compact actively Q-switched diode-pumped lasers based on Yb3+-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the Yb3+:LuAlO3 actively Q-switched laser.One of the most promising crystalline hosts for rare-earth ions are Perovskite-like aluminate crystals. Yttrium aluminate crystal YAlO3 (YAP) is a well-known host with good thermal and mechanical properties (thermal conductivity for undoped crystal is about 11 W/mΒ·K and about 8 W/mΒ·K for Yb(5 at.%):YAP) similar to those of YAG. The reduction in the thermal conductivity of doped laser crystal in comparison with host materials is small in the case of ions with close atomic mass and ionic radii such as for Yb3+ and Lu3+. This feature makes LuAlO3 (LuAP) more promising host crystal for doping by Yb3+ ions in contrast to YAP especially for high output power laser systems.Β In our work, for the first time to the best of our knowledge actively Q-switching laser operation of Yb3+:LuAP single crystal was demonstrated. The maximum average output power of 4.9 W at 50 kHz pulse repetition frequency (PRF) with opt.-to-opt. efficiency of 21 % was obtained with 30 % OC transmittance. Output power as high as 3.3 W with 333 Β΅J-laser pulses with duration of about 11.5 ns was demonstrated at 10 kHz PRF the corresponding pulse peak power was 29 kW. 97 Β΅J second harmonic pulses obtained with 29 % conversion efficiency at 10 kHz PRF.Performed investigations show high potential of Yb3+:LuAP crystals as active elements of compact diode pumped actively Q-switched lasers due to high stimulated emission cross-section (β 3.74Ξ10-20Β cm2) at 999.6 nm wavelength and significant reduction of heat load on the active element when pumping around 980 nm and generation around 999 nm.ΠΠΎΠΌΠΏΠ°ΠΊΡΠ½ΡΠ΅ Π»Π°Π·Π΅ΡΡ Ρ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠ΅ΠΉ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΠ΅Π·ΠΎΠ½Π°ΡΠΎΡΠ°, ΠΏΠΎΡΡΡΠΎΠ΅Π½Π½ΡΠ΅ Π½Π° ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°Ρ
, Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΈΠΎΠ½Π°ΠΌΠΈ Yb3+, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈΠ½ΡΠ΅ΡΠ΅Ρ Π΄Π»Ρ ΡΠΈΡΠΎΠΊΠΎΠ³ΠΎ ΡΡΠ΄Π° Π½Π°ΡΡΠ½ΡΡ
, ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΡΡ
ΠΈ Π±ΠΈΠΎΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΈΡ
ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΉ. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ΅ΠΆΠΈΠΌΠ° Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠΈ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΠ΅Π·ΠΎΠ½Π°ΡΠΎΡΠ° Π»Π°Π·Π΅ΡΠ° Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:LuAlO3.ΠΠ΄Π½ΠΈΠΌΠΈ ΠΈΠ· Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΠΌΠ°ΡΡΠΈΡ Π΄Π»Ρ Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠΎΠ½Π°ΠΌΠΈ ΡΠ΅Π΄ΠΊΠΎΠ·Π΅ΠΌΠ΅Π»ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΡΠ²Π»ΡΡΡΡΡ ΠΊΡΠΈΡΡΠ°Π»Π»Ρ Π°Π»ΡΠΌΠΈΠ½Π°ΡΠΎΠ² ΡΠΎ ΡΡΡΡΠΊΡΡΡΠΎΠΉ ΠΏΠ΅ΡΠΎΠ²ΡΠΊΠΈΡΠ°. ΠΡΠΈΡΡΠ°Π»Π»Ρ ΠΈΡΡΡΠΈΠ΅Π²ΠΎΠ³ΠΎ Π°Π»ΡΠΌΠΈΠ½Π°ΡΠ° YAlO3 (YAP) ΡΠΈΡΠΎΠΊΠΎ ΠΈΠ·Π²Π΅ΡΡΠ½Ρ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΌΠ°ΡΡΠΈΡ Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ Ρ
ΠΎΡΠΎΡΠΈΠΌ ΡΠ΅ΡΠΌΠΎΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌ (ΡΠ΅ΠΏΠ»ΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΎΡΡΡ Π½Π΅Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΡΠ°Π»Π»Π° ΠΎΠΊΠΎΠ»ΠΎ 11 ΠΡ/ΠΌΒ·Π ΠΈ ΠΎΠΊΠΎΠ»ΠΎ 8 ΠΡ/ΠΌΒ·Π Π΄Π»Ρ Yb(5 Π°Ρ.%):YAP), Π±Π»ΠΈΠ·ΠΊΠΈΠΌ ΠΊ ΠΊΡΠΈΡΡΠ°Π»Π»Π°ΠΌ YAG. Π‘Π½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΡΠ΅ΠΏΠ»ΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΎΡΡΠΈ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΡΠ°Π»Π»Π° ΠΏΡΠΈ Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΡΠΈΡΡΠΎΠΉ ΠΌΠ°ΡΡΠΈΡΠ΅ΠΉ ΠΌΠ°Π»ΠΎ Π² ΡΠ»ΡΡΠ°Π΅ Π½Π΅Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΎΡΠ»ΠΈΡΠ°ΡΡΠΈΡ
ΡΡ Π°ΡΠΎΠΌΠ½ΡΡ
ΠΌΠ°ΡΡ ΠΈ ΠΈΠΎΠ½Π½ΡΡ
ΡΠ°Π΄ΠΈΡΡΠΎΠ² ΠΊΠ°ΠΊ Π² ΡΠ»ΡΡΠ°Π΅ Ρ ΠΈΠΎΠ½Π°ΠΌΠΈ Yb3+ ΠΈ Lu3+. ΠΠ°Π½Π½Π°Ρ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΡ Π΄Π΅Π»Π°Π΅Ρ ΠΊΡΠΈΡΡΠ°Π»Π» LuAlO3 (LuAP) Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠ°ΡΡΠΈΡΠ΅ΠΉ Π΄Π»Ρ ΠΈΠΎΠ½ΠΎΠ² Yb3+ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ YAP ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎ Π² ΡΠ»ΡΡΠ°Π΅ Π»Π°Π·Π΅ΡΠ½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ Ρ Π²ΡΡΠΎΠΊΠΎΠΉ ΡΡΠ΅Π΄Π½Π΅ΠΉ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΡΡ.Π Π΅ΠΆΠΈΠΌ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠΈ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ Π»Π°Π·Π΅ΡΠ° Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:LuAP ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ Π²ΠΏΠ΅ΡΠ²ΡΠ΅ Π² Π½Π°ΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅. ΠΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½Π°Ρ ΡΡΠ΅Π΄Π½ΡΡ Π²ΡΡ
ΠΎΠ΄Π½Π°Ρ ΠΌΠΎΡΠ½ΠΎΡΡΡ 4,9 ΠΡ ΠΏΠΎΠ»ΡΡΠ΅Π½Π° ΠΏΡΠΈ ΡΠ°ΡΡΠΎΡΠ΅ ΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΠΌΠΏΡΠ»ΡΡΠΎΠ² 50 ΠΊΠΡ ΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ 21 % Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ Π·Π΅ΡΠΊΠ°Π»Π° ΠΏΡΠΎΠΏΡΡΠΊΠ°Π½ΠΈΠ΅ΠΌ 30 %. ΠΡΡ
ΠΎΠ΄Π½Π°Ρ ΠΌΠΎΡΠ½ΠΎΡΡΡ 3,3 ΠΡ, Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΈΠΌΠΏΡΠ»ΡΡΠ° 11,5 Π½Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ ΠΏΡΠΈ ΡΠ°ΡΡΠΎΡΠ΅ ΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΠΌΠΏΡΠ»ΡΡΠΎΠ² 10 ΠΊΠΡ, ΡΠ½Π΅ΡΠ³ΠΈΡ ΠΈΠΌΠΏΡΠ»ΡΡΠ° ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 333 ΠΌΠΊΠΠΆ, ΠΏΠΈΠΊΠΎΠ²Π°Ρ ΠΌΠΎΡΠ½ΠΎΡΡΡ 29 ΠΊΠΡ. ΠΠΌΠΏΡΠ»ΡΡΡ ΡΠ½Π΅ΡΠ³ΠΈΠ΅ΠΉ 97 ΠΌΠΊΠΠΆ ΠΏΡΠΈ ΡΠ°ΡΡΠΎΡΠ΅ ΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ 10 ΠΊΠΡ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π½Π° ΡΠ°ΡΡΠΎΡΠ΅ Π²ΡΠΎΡΠΎΠΉ Π³Π°ΡΠΌΠΎΠ½ΠΈΠΊΠΈ Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡΡ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ 29 %.Β ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·ΡΠ²Π°ΡΡ, ΡΡΠΎ Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ Π²ΡΡΠΎΠΊΠΎΠΌΡ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΠΎΠΌΡ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΡΠΈΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ (β 3,74Ξ10-20 ΡΠΌ2 ) Π½Π° Π΄Π»ΠΈΠ½Π΅ Π²ΠΎΠ»Π½Ρ 999,6 Π½ΠΌ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌΡ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠΉ Π½Π°Π³ΡΡΠ·ΠΊΡ Π½Π° Π°ΠΊΡΠΈΠ²Π½ΡΠΉ ΡΠ»Π΅ΠΌΠ΅Π½Ρ ΠΏΡΠΈ Π½Π°ΠΊΠ°ΡΠΊΠ΅ Π² ΠΎΠ±Π»Π°ΡΡΠΈ 980 Π½ΠΌ ΠΈ Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ Π² ΠΎΠ±Π»Π°ΡΡΠΈ 999 Π½ΠΌ, ΠΊΡΠΈΡΡΠ°Π»Π»Ρ Yb3+:LuAP Π²Π΅ΡΡΠΌΠ° ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½Ρ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠ½ΡΡ
ΡΠ²Π΅ΡΠ΄ΠΎΡΠ΅Π»ΡΠ½ΡΡ
Π»Π°Π·Π΅ΡΠΎΠ² Ρ Π΄ΠΈΠΎΠ΄Π½ΠΎΠΉ Π½Π°ΠΊΠ°ΡΠΊΠΎΠΉ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΡ
Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠΈ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ. ΠΎΡΠ΅Π»ΡΠ½ΡΡ
Π»Π°Π·Π΅ΡΠΎΠ² Ρ Π΄ΠΈΠΎΠ΄Π½ΠΎΠΉ Π½Π°ΠΊΠ°ΡΠΊΠΎΠΉ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΡ
Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠΈ Π΄ΠΎΠ±ΡΠΎΡΠ½ΠΎΡΡΠΈ
ΠΡΡΠΎΠΊΠΎΠΌΠΎΡΠ½ΡΠΉ Π»Π°Π·Π΅Ρ Π½Π° ΠΊΡΠΈΡΡΠ°Π»Π»Π΅ Yb3+:YAlO3 ,ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΠΉ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΠΈΠ½Ρ ΡΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ΄ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΡΡ Π·Π΅ΡΠΊΠ°Π» Ρ Π½Π°ΡΡΡΠ°ΡΡΠΈΠΌΡΡ ΠΏΠΎΠ³Π»ΠΎΡΠΈΡΠ΅Π»Π΅ΠΌ
Yttrium aluminium perovskite YAlO3Β (YAP) crystal, doped with rare-earth ions, has been extensively studied as a diode-pumped laser host material. The wide interest to rare-earth ions doped YAP crystals is explained by its good thermal and mechanical properties, high natural birefringence, widely used Czochralski Β growth method. The aim of this work was to study the Yb3+:YAlO3 Β crystal as an active medium for high Β power mode-locked laser.Yb3+-doped perovskite-like aluminate crystals have unique spectroscopic and thermooptical properties that allowed using these crystals as an active medium of high power continuous wave (CW) and modelocked (ML) bulk lasers with diode pumping.growth method. The aim of this work was to study the Yb3+:YAlO3 Β crystal as an active medium for high Β power mode-locked laser.In our work spectroscopic properties of Yb:YAP crystal and laser characteristics in CW and ML regimes are investigated. Maximum output power of 4 W with optical-to-optical efficiency of 16.3 % and 140 fs pulse duration have been obtained for Yb:YAP Eβ//c-polarization with 10 % output coupler transmittance. Tunability range as wide as 67 nm confirms high promise of using Yb:YAP crystal for lasers working in wide spectral range.Β ΠΡΠΈΡΡΠ°Π»Π»Ρ ΠΈΡΡΡΠΈΠΉ-Π°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΠΎΠ³ΠΎ ΠΏΠ΅ΡΠΎΠ²ΡΠΊΠΈΡΠ° YAlO3 (YAP), Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΠΈΠΎΠ½Π°ΠΌΠΈ ΡΠ΅Π΄ΠΊΠΎΠ·Π΅ΠΌΠ΅Π»ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎ ΠΈΠ·ΡΡΠ°Π»ΠΈΡΡ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΡΠ΅Π΄ Π»Π°Π·Π΅ΡΠΎΠ² Ρ Π΄ΠΈΠΎΠ΄Π½ΠΎΠΉ Π½Π°ΠΊΠ°ΡΠΊΠΎΠΉ. ΠΠ½ΡΠ΅ΡΠ΅Ρ ΠΊ Π΄Π°Π½Π½ΡΠΌ ΠΊΡΠΈΡΡΠ°Π»Π»Π°ΠΌ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½ ΠΈΡ
Π²ΡΡΠΎΠΊΠΈΠΌΠΈ ΡΠ΅ΠΏΠ»ΠΎΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΈ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ, Π²ΡΡΠΎΠΊΠΈΠΌ Π΄Π²ΡΠ»ΡΡΠ΅ΠΏΡΠ΅Π»ΠΎΠΌΠ»Π΅Π½ΠΈΠ΅ΠΌ, Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡΡ ΡΠΎΡΡΠ° ΠΏΠΎ ΡΠΈΡΠΎΠΊΠΎ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½ΡΠ½Π½ΠΎΠΌΡ ΠΌΠ΅ΡΠΎΠ΄Ρ Π§ΠΎΡ
ΡΠ°Π»ΡΡΠΊΠΎΠ³ΠΎ. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ Π±ΡΠ»ΠΎ ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΊΡΠΈΡΡΠ°Π»Π»Π° Yb3+:YAlO3Β Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΡΠ΅Π΄Ρ Π»Π°Π·Π΅ΡΠ° Β Ρ Π²ΡΡΠΎΠΊΠΎΠΉ ΡΡΠ΅Π΄Π½Π΅ΠΉ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΡΡ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠ΅Π³ΠΎ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΠΈΠ½Ρ
ΡΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ΄.ΠΡΠΈΡΡΠ°Π»Π»Ρ YAlO3, Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΡΡΡΡ
Π²Π°Π»Π΅Π½ΡΠ½ΡΠΌΠΈ ΠΈΠΎΠ½Π°ΠΌΠΈ ΠΈΡΡΠ΅ΡΠ±ΠΈΡ ΠΈΠΌΠ΅ΡΡ ΡΠ½ΠΈΠΊΠ°Π»ΡΠ½ΡΠ΅ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΡΠ΅ΠΏΠ»ΠΎΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°, ΡΡΠΎ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ Π΄Π°Π½Π½ΡΠ΅ ΠΊΡΠΈΡΡΠ°Π»Π»Ρ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΡΠ΅Π΄ Π»Π°Π·Π΅ΡΠΎΠ² Ρ Π²ΡΡΠΎΠΊΠΎΠΉ ΡΡΠ΅Π΄Π½Π΅ΠΉ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΡΡ ΠΈ Π΄ΠΈΠΎΠ΄Π½ΠΎΠΉ Π½Π°ΠΊΠ°ΡΠΊΠΎΠΉ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΡ
Π² ΡΠ΅ΠΆΠΈΠΌΠ°Ρ
Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΠΎΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ ΠΈ ΠΏΠ°ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠΈΠ½Ρ
ΡΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ΄.Π ΡΠ°Π±ΠΎΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΡΠ΅ΡΠΊΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»Π° Yb:YAP, Π° ΡΠ°ΠΊΠΆΠ΅ Π²ΡΡ
ΠΎΠ΄Π½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π»Π°Π·Π΅ΡΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΡΠ°Π»Π»Π°, ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΡ
Π² ΡΠ΅ΠΆΠΈΠΌΠ°Ρ
Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΠΎΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ ΠΈ ΠΏΠ°ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠΈΠ½Ρ
ΡΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ΄. Π‘ΡΠ΅Π΄Π½ΡΡ Π²ΡΡ
ΠΎΠ΄Π½Π°Ρ ΠΌΠΎΡΠ½ΠΎΡΡΡ 4 ΠΡ Ρ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡΡ 16.3 % ΠΈ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡΡ ΠΈΠΌΠΏΡΠ»ΡΡΠ° 140 ΡΡ ΠΏΠΎΠ»ΡΡΠ΅Π½Π° Π΄Π»Ρ E//c-ΠΏΠΎΠ»ΡΡΠΈΠ·Π°ΡΠΈΠΈ ΠΏΡΠΈ ΠΏΡΠΎΠΏΡΡΠΊΠ°Π½ΠΈΠΈ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ Π·Π΅ΡΠΊΠ°Π»Π° 10 %. ΠΠΈΠ°ΠΏΠ°Π·ΠΎΠ½ ΠΏΠ΅ΡΠ΅ΡΡΡΠΎΠΉΠΊΠΈ 67 Π½ΠΌ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π°Π΅Ρ Π²ΡΡΠΎΠΊΠΈΠ΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΊΡΠΈΡΡΠ°Π»Π»Π° Yb:YAP Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΡΠ΅Π΄Ρ Π»Π°Π·Π΅ΡΠΎΠ², ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΡ
Π² ΡΠΈΡΠΎΠΊΠΎΠΌ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠΌ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅
Radiation-balanced lasing and amplification
Quantum statistical theory of radiation-balanced laser is constructed within method of nonequilibrium statistical operator. System of equations is derived for number of phonons and collective population difference. Their numerical solutions are obtained and discussed
Diode-pumped continuous Wave Tm:KLu(WO<inf>4</inf>)<inf>2</inf> and Tm:KY(WO<inf>4</inf>)<inf>2</inf> microchip lasers
Β© 2016 IEEE.Laser performance of Tm doped KLu(WO4)2 and KY(WO4)2 crystals was investigated in a microchip cavity configuration with fiber coupled laser diode as a pump source. The highest output power of 1013 mW with 51 % slope efficiency was obtained for Tm:KY(WO4)2 crystal. Using Tm:KLu(WO4)2 crystal output power of 912 mW and slope efficiency of 38 % were achieved
Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation
Β© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (TmβHo) and back (HoβTm) transfers, respectively, as well as equilibrium constant Ξ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the FΓΆrster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode
Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation
Β© 2016 Optical Society of America.An investigation of Tm-Ho energy transfer in Tm(5at.%),Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (TmβHo) and back (HoβTm) transfers, respectively, as well as equilibrium constant Ξ were evaluated. The obtained results were supported by calculation of microscopic interaction parameters according to the FΓΆrster-Dexter theory for a dipoledipole interaction. Diode-pumped continuous-wave operation of Tm,Ho:KYW microchip laser was demonstrated, for the first time to our knowledge. Maximum output power of 77 mW at 2070 nm was achieved at the fundamental TEM00 mode
In-band pumped room-temperature Er:KY(WO4)2 laser emitting around 1:6 mm
We present efficient continuous-wave operation of an Er:KY(WO 4)2 crystal under in-band pumping by a compact diode-pumped Er, Yb:GdAl3(BO3)4 laser. Maximum slope efficiency of 27% and output power of 35 mW at 1609.5 nm were obtained with beam propagation factor M2 < 1:2. Absorption and stimulated emission cross-section spectra, as well as the radiative lifetime of the 4I13=2 energy level, were determined
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