Abstract
Tetragonal calcium rare-earth aluminates, CaLnAlO4, combine a structural disorder with good thermo-mechanical properties. We report on efficient continuous-wave (CW) and passively Q-switched (PQS) ∼2-μm laser operation of a 4 at.% Tm:CaYAlO4 crystal using a compact (6-mm-long) plane-parallel cavity. The pump source was a 791 nm fibercoupled AlGaAs laser diode. The CW output power reached 5.78 W at ∼1970 nm with a slope efficiency of 43.6% and a linear laser polarization. Stable PQS operation was achieved using a single-walled carbon nanotube (SWCNT) based transmission-type saturable absorber. The PQS laser generated 2.15 W at ∼1945 nm, a record-high average output power for this type of lasers. The best pulse characteristics (energy/duration) were 9.1 μJ/165 ns at a repetition rate of 235 kHz.
Original language | English |
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Title of host publication | Solid State Lasers XXIX |
Subtitle of host publication | Technology and Devices |
Editors | W. Andrew Clarkson, Ramesh K. Shori |
Publisher | SPIE |
ISBN (Electronic) | 9781510632813 |
DOIs | |
State | Published - 2020 |
Externally published | Yes |
Event | Solid State Lasers XXIX: Technology and Devices 2020 - San Francisco, United States Duration: Feb 4 2020 → Feb 6 2020 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 11259 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | Solid State Lasers XXIX: Technology and Devices 2020 |
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Country/Territory | United States |
City | San Francisco |
Period | 02/4/20 → 02/6/20 |
Funding
Spanish Government (MAT2016-75716-C2-1-R (AEI/FEDER,UE), Generalitat de Catalunya (2017SGR755).
Keywords
- Calcium aluminates
- Carbon nanotubes
- Diode-pumping
- Passive Q-switching
- Thulium lasers