TY  - JOUR
AU  - Kilinc, Muharrem
AU  - Demirbas, Uemit
AU  - Thesinga, Jelto
AU  - Kellert, Martin
AU  - Kärtner, Franz
AU  - Pergament, Mikhail
TI  - Fractional thermal load in cryogenically cooled Yb:YLF and Yb:YAG lasers
JO  - Optical materials express
VL  - 14
IS  - 6
SN  - 2159-3930
CY  - Washington, DC
PB  - Optica
M1  - PUBDB-2024-00734
SP  - 1499
PY  - 2024
AB  - We present a method for the direct measurement of fractional thermal load (FTL) in cryogenically cooled laser crystals. The experimental methodology involves characterizing the liquid nitrogen evaporation rate in a dewar containing the laser crystals, allowing for the accurate determination of FTL. The FTL is measured to be 1.7 × quantum defect (QD) for Yb:YLF and 1.5 × QD for Yb:YAG under continuous wave lasing conditions. The measured FTL values are then used to calculate the temperature distribution inside the crystals as a function of pump power, and the simulation results are found to be in very good agreement with the in-situ temperature measurements using contactless optical luminescence thermometry. The method and findings presented in this work hold great potential to benefit laser engineers and scientists working with cryogenic lasers to address and overcome temperature-dependent handicaps.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001248778900002
DO  - DOI:10.1364/OME.521506
UR  - https://bib-pubdb1.desy.de/record/602688
ER  -