TUTCRIS - Tampereen teknillinen yliopisto


Progress in VECSEL technology for laser guide stars

Tutkimustuotos: Konferenssiesitys, posteri tai abstrakti


TilaJulkaistu - 2019
OKM-julkaisutyyppiEi OKM-tyyppiä
TapahtumaThe 13th Annual Workshop on Laser Technology and Systems for Adaptive Optics - Québec, Kanada
Kesto: 7 kesäkuuta 20198 kesäkuuta 2019


ConferenceThe 13th Annual Workshop on Laser Technology and Systems for Adaptive Optics


VECSELs (vertical cavity surface emitting lasers) have recently emerged as an attractive laser platform for generating high-brightness visible radiation [1]. In particular, VECSELs can be used to generate high power beams at yellow wavelength range [2], making it attractive for adaptive optics on earth-based telescopes. Their key advantages include ability to reach power levels of more than 10 W in fundamental transversal mode, low-noise single frequency operation, relatively broad wavelength tuning, and simpler and more compact architectures compared to alternative frequency converted solid-state laser systems used to generate visible radiation.
We review progress in developing VECSEL technology with fundamental emission at 1180 nm and steps towards frequency doubled single-frequency systems at 590 nm range. The key enabling technology is the gain mirror, which has reached a maturity level suitable for generating more than 70 W at 1180 nm, with optical efficiencies in the range of 30% [3]. We then introduce a compact package laser system enabling single frequency operation with 100 kHz linewidth at infrared and locking to external reference system. Finally, we presented recent development steps towards demonstrating advanced intracavity converted VECSEL-based guide star lasers.