In this paper, we report the first LED-pumped transition-metal-doped laser oscillator and amplifier based on an alexandrite crystal (Cr3+:BeAl2O4). A Ce:YAG luminescent concentrator illuminated by blue LEDs is used to reach higher pump powers than with LEDs alone. The luminescent 200-mm-long-composit luminescent concentrator involving 2240 LEDs can delivers up to 268 mJ for a peak irradiance of 8.5 kW/cm2. In oscillator configuration, an LED-pumped alexandrite laser delivering an energy of 2.9 mJ at 748 nm in free running operation is demonstrated. In the cavity, we measured a double pass small signal gain of 1.28, in good agreement with numerical simulations. As amplifier, the system demonstrated to boost a CW Ti:sapphire laser by a factor of 4 at 750 nm in 8 passes with a large tuning range from 710 nm to 800 nm.
Pierre Pichon, Jean-Philippe Blanchot, François Balembois, Frédéric Druon, and Patrick Georges, "LED-pumped Alexandrite laser oscillator and amplifier," Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105111J (Presented at SPIE LASE: February 01, 2018; Published: 15 February 2018); https://doi.org/10.1117/12.2287808.
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