Journal Article

PUBDB-2024-00734

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fractional thermal load in cryogenically cooled Yb:YLF and Yb:YAG lasers

Kilinc, M. (Corresponding author)CFEL*DESY* ; Demirbas, U.Extern*DESY* ; Thesinga, J.CFEL*DESY* ; Kellert, M.CFEL*DESY* ; Kärtner, F.CFEL*XFEL.EU*DESY* ; Pergament, M.CFEL*DESY*

2024
Optica Washington, DC

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Please use a persistent id in citations: doi:10.1364/OME.521506  doi:10.3204/PUBDB-2024-00734

Abstract: 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.

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Contributing Institute(s):

1. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. AXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920) (609920)
3. DFG project 405983224 - Erzeugung von Sub-Picosekunden Elektronenpaketen durch starke THz-Felder für Hochfeld- Elektronenbeschleunigung und ultraschnelle Elektronen-beugende Bildgebung (405983224) (405983224)

Experiment(s):

1. AXSIS: Frontiers in Attosecond X-ray Science, Imaging and Spectroscopy

Appears in the scientific report 2024

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