Polarized spectral properties and 2.3â
µm laser performance of the Tm:YVO4 crystal.
Opt Express
; 32(10): 18055-18067, 2024 May 06.
Article
in En
| MEDLINE
| ID: mdl-38858971
ABSTRACT
The polarized spectral properties and â¼2.3â
µm high-power continuous-wave laser operation of Tm3+-doped yttrium orthovanadate crystal (TmYVO4) are reported. For the 3H4 â 3H5 transition, the stimulated-emission cross-section σSE is 1.01 × 10-20 cm2 at 2276â
nm corresponding to a large emission bandwidth of 52â
nm (for π-polarization). Pumped by a 794â
nm laser diode, the 1.5 at.% TmYVO4 laser delivered 5.52 W at 2.29â
µm with a slope efficiency of 19.9%, a laser threshold of 8.70 W, and a linear laser polarization (π). The Tm laser operated on the cascade scheme (on the 3H4 â 3H5 and 3F4 â 3H6 transitions) which was mainly responsible for the observed high laser slope efficiency. We also report on the first passively Q-switched TmYVO4 laser at 2.3â
µm by employing porous nano-grained cuprous selenide (PNG-Cu2Se) as a saturable absorber. The shortest pulse duration and the highest single pulse energy amounted to 706â
ns and 3.65 µJ, respectively, corresponding to a pulse repetition rate of 62.8 kHz.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Express
Year:
2024
Document type:
Article