Alexandrite laser in Q-switched single longitudinal mode operation pumped by a fiber-coupled diode module

A. Munk; B. Jungbluth; M. Strotkamp; H.-D. Hoffmann; R. Poprawe; J. Höffner

doi:10.1117/12.2508402

19 March 2019 Alexandrite laser in Q-switched single longitudinal mode operation pumped by a fiber-coupled diode module

A. Munk, B. Jungbluth, M. Strotkamp, H.-D. Hoffmann, R. Poprawe, J. Höffner

Proceedings Volume 10896, Solid State Lasers XXVIII: Technology and Devices; 1089610 (2019) https://doi.org/10.1117/12.2508402
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

In this work a diode-pumped Q-switched Alexandrite laser operating in single longitudinal mode (SLM) at the potassium resonance line is presented. The self-developed laser diode pump device is fiber-coupled ( = 400μm, NA=0.22) and delivers a pump energy of 18 mJ at 636 nm with a pulse duration of 120 μs and a repetition rate of 500 Hz. Pump light not absorbed in single-pass through the 7 mm long crystal is recollimated, polarization adjusted and refocused into the crystal. The Alexandrite laser yields a pulse energy of 1.7 mJ at a repetition rate of 500 Hz with a high pulse-to-pulse stability of 0.2 % (rms) and a beam quality of M² < 1.1 in both spatial directions. The output beam is round and stigmatic without further beam shaping. The electro-optical efficiency of the laser system is 2 % which is approximately two magnitudes higher than of comparable flashlamp-pumped Alexandrite laser systems. By seeding the resonator with a SLM diode laser and actively stabilizing the cavity length, SLM-operation at the resonance line of potassium at 769.898 nm with a linewidth of approximately 10 MHz is achieved. Thereby the laser fulfills all the requirements for a resonance-lidar system. The investigations presented in this publication show the feasibility for pumping a complex ring resonator with a fibercoupled pump module in the red spectral region. This presents an important step to compact lidar systems for autonomous measurements under rough environmental conditions.

Citation Download Citation

A. Munk, B. Jungbluth, M. Strotkamp, H.-D. Hoffmann, R. Poprawe, and J. Höffner "Alexandrite laser in Q-switched single longitudinal mode operation pumped by a fiber-coupled diode module", Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 1089610 (19 March 2019); https://doi.org/10.1117/12.2508402

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