Abstract
We developed a light-emitting diode (LED)-pumped Cr:LiSAF laser operating in Q-switched and cavity-dumped regimes. The laser produces 1.1 mJ pulses with a pulse duration of 8.5 ns at a repetition rate of 10 Hz on a broad spectrum centered at 840 nm with a full width at half maximum of 23 nm. After frequency tripling in two cascaded LBO crystals, we obtained 7 ns pulses with an energy of 13 µJ at 280 nm and with a spectral width of 0.5 nm, limited by the spectral acceptance of the phase matching process. By rotating both LBO crystals, UV emission is tuned from 276 nm to 284 nm taking advantage of the broad infrared spectrum of the Cr:LiSAF laser.
Highlights
With the impressive development of high-power light-emitting diode (LED) in the visible, LED-pumped lasers have found a regain of interest since their first demonstration in the 1960's [1]
The high pump power density necessary to reach the threshold is achieved by LED-pumped Ce:YAG concentrators emitting in the yellow-orange [7]
We found an energy of 13 μJ at 280 nm, corresponding to the third harmonic generation (THG) of the peak of the infrared spectrum at 840 nm
Summary
With the impressive development of high-power LED in the visible, LED-pumped lasers have found a regain of interest since their first demonstration in the 1960's [1]. Tunability has been really demonstrated only very recently on LED-pumped lasers with crystals doped with transition-metal ions like alexandrite (Cr3+:BeAl2O4) with a tuning range between 715 nm and 800 nm [4], Cr:LiSAF (Cr3+:LiSrAlF6) between 810 nm and 960 nm [5], and Ti:sapphire (Ti3+:Al2O3) between 755 nm and 845 nm [6] In these cases, the high pump power density necessary to reach the threshold is achieved by LED-pumped Ce:YAG concentrators emitting in the yellow-orange [7]. Compared to other pumping sources, LED-pumped concentrators combine the advantages of semi-conductors (compacity and stability), with the advantages of flashlamps (energy, robustness and low cost) They can provide an energy in the 100 mJ range and a peak power reaching 10 kW/cm2 [6]. The paper presents the first active Qswitching and cavity dumped Q-switching of an LED concentrator pumped Cr:LiSAF oscillator and its frequency conversion in the ultraviolet
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