Multi-watt continuous-wave and passively Q-switched Tm:CaYAlO4 micro-lasers

Mengting Chen, Pavel Loiko, Fangxin Yue, Venkatesan Jambunathan, Antonio Lucianetti, Tomas Mocek, Josep Maria Serres, Magdalena Aguiló, Francesc Díaz, Tae Gwan Park, Ji Eun Bae, Fabian Rotermund, Xiaodong Xu, Jun Xu, Shibo Dai, Zhenqiang Chen, Uwe Griebner, Valentin Petrov, Xavier Mateos, A. Major

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

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 languageEnglish
Title of host publicationSolid State Lasers XXIX
Subtitle of host publicationTechnology and Devices
EditorsW. Andrew Clarkson, Ramesh K. Shori
PublisherSPIE
ISBN (Electronic)9781510632813
DOIs
StatePublished - 2020
Externally publishedYes
EventSolid State Lasers XXIX: Technology and Devices 2020 - San Francisco, United States
Duration: Feb 4 2020Feb 6 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11259
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceSolid State Lasers XXIX: Technology and Devices 2020
Country/TerritoryUnited States
CitySan Francisco
Period02/4/2002/6/20

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

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