LED-pumped passively Q-switched Cr:LiSAF laser

Abstract : We report the first light-emitting diode (LED)-pumped Cr:LiSAF laser both in quasi-continuous-wave (qcw) and passively Q-switched operation. This work is based on the recent development of LED-pumped luminescent concentrators. Combining the capacity of high density integration of blue LEDs with the excellent properties of Ce:YAG luminescent concentrators, this new pump source can deliver high irradiance (7.3 kW/cm 2) in the visible to pump Cr:LiSAF. The Cr:LiSAF laser demonstrates an energy of 8.4 mJ at 850 nm in qcw (250 µs-pulses at 10 Hz). A small-signal-gain per roundtrip of 1.44 at 850 nm and a wavelength tunability between 810 nm and 960 nm have been performed. A passively-Q-switched oscillator is also presented using a Cr:YAG saturable absorber. A peak power of 3.1 kW is obtained with pulse energy of 130 µJ and duration of 41.6 ns.
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P. Pichon, Frédéric Druon, Jean-Philippe Blanchot, François Balembois, Patrick Georges. LED-pumped passively Q-switched Cr:LiSAF laser. Optics Letters, Optical Society of America, 2018, 43 (18), pp.4489. ⟨10.1364/OL.43.004489⟩. ⟨hal-02193018⟩

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