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Satellite-based laser-based remote sensing (lidar) of the atmosphere can be used for meteorology, atmospheric chemistry and climate change but requires high energy (100mJ-class) lasers with precision wavelength control. A high energy Alexandrite laser source is an interesting alternative to Nd:YAG in future Earth Observation missions with its added scientific benefit of broad wavelength tunability...
We report the successfully demonstration of a wavelength tunable passive Q-switched Alexandrite laser with semiconductor saturable absorber mirror (SESAM) and using a red diode (AlGaInP) pump laser at 635 nm. This system allows the potential for low-cost, compact wavelength-tunable short pulse sources, compared to active Q-switch pulsing methods [1, 2].
Alexandrite (Cr-doped Chrysoberyl) is a broadly-tunable vibronic solid-state laser material with many superior thermal and mechanical properties for high power and high pulse energy operation [1]. Until now, commercial Alexandrite has been flashlamp pumped with resulting low efficiency, and almost no operation with diode-pumping has been demonstrated due to the poor availability of high power red...
6.5 W 1.3 mum passively Q-switched output was demonstrated from a side-pumped Nd doped Gd0.6Y0.4VO4 bounce laser in combination with V:YAG saturable absorber crystal. Slope efficiency of 24% was achieved.
High-efficiency high-power operation of 2 at.% crystalline Nd:YAG is demonstrated. CW output power of 46.1 W and slope efficiency of 60% are obtained, and 11 mJ pulses at 100 Hz with QCW-pumping are achieved with 12 ns Q-switched pulses.
Up to 700 kHz high repetition active Q-switching was achieved with a pulse-width of < 40 ns by using a diode-side-pumped Nd:GdxY1-xVO4 bounce amplifier. The average output power of 17.5 W was obtained at a pump power of 41 W.
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