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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Tunable diode-pumped and frequency-doubled Cr:LiSAF lasers.

P Laperle, K J Snell, A Chandonnet

    Applied Optics
    |July 20, 1997
    PubMed
    Summary

    A diode-pumped chromium-doped lithium strontium aluminum fluoride (Cr:LiSAF) laser achieved nearly 1 W of quasi-continuous wave power and over 20 mW of continuous wave blue light. Thermal fluorescence quenching limited maximum output power.

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    Published on: December 18, 2015

    Area of Science:

    • Laser Physics
    • Solid-State Lasers
    • Nonlinear Optics

    Background:

    • Diode-pumped solid-state lasers offer efficient and compact sources for various applications.
    • Cr:LiSAF is a promising gain medium for tunable laser operation in the visible spectrum.
    • Intracavity frequency doubling enables the generation of visible laser output from infrared lasers.

    Purpose of the Study:

    • To investigate the performance of a diode-pumped Cr:LiSAF laser.
    • To explore its intracavity frequency-doubled operation for blue light generation.
    • To identify factors limiting output power and optimize laser design.

    Main Methods:

    • Utilized a diode-pumped Cr:LiSAF laser system.
    • Employed intracavity frequency doubling with a lithium triborate (LBO) crystal.
    • Investigated the effect of pump size on temperature rise and small-signal gain.

    Main Results:

    • Achieved nearly 1 W of quasi-continuous wave (quasi-cw) output power at 870 nm in multimode operation.
    • Generated over 20 mW of continuous wave (cw) TEM(00) second-harmonic power at 435 nm.
    • Demonstrated an infrared-to-visible conversion efficiency of 33% for blue light generation.
    • Identified thermal fluorescence quenching as the primary limitation for maximum output power.

    Conclusions:

    • The diode-pumped Cr:LiSAF laser system is capable of efficient blue light generation.
    • The achieved 20 mW cw blue output is a significant result for diode-pumped systems.
    • Further optimization is needed to overcome thermal limitations and increase output power.