Abstract
A 12.5 J second-harmonic generation with 71.5% conversion efficiency at 0.6 Hz repetition rate from a diode-pumped Nd:glass laser system has been demonstrated by using a CsLiB(6)O(10) (CLBO) nonlinear optical crystal as a frequency doubler. The CLBO has aperture of 40 mm x 40 mm and thickness of 14 mm with Type-II phase matching. The CLBO is mounted into a housing which flows dry nitrogen gas on the CLBO's face. There is no significant reduction of conversion efficiency by exposing of over 600,000 shots for intermissive experiment during 3 years. In our knowledge, these experimental results of output energy and conversion efficiency are highest performance as second-harmonic generation of a diode-pumped solid state laser by using one CLBO nonlinear crystal. In this paper, potential of the CLBO as a frequency converter for repetitive kJ class laser is discussed.
Highlights
Frequency conversion is useful technique for extending utility of high power lasers [1, 2]
A 12.5 J second-harmonic generation with 71.5% conversion efficiency at 0.6 Hz repetition rate from a diode-pumped Nd:glass laser system has been demonstrated by using a CsLiB6O10 (CLBO) nonlinear optical crystal as a frequency doubler
A 12.5 J Second-harmonic generation (SHG) with 71.5% conversion efficiency at 0.6 Hz repetition rate from diode-pumped Nd:glass laser system was demonstrated by using a CLBO nonlinear crystal as a frequency doubler
Summary
Frequency conversion is useful technique for extending utility of high power lasers [1, 2]. Frequency doubling technique for a 10 kW class high average-power lasers realized by high repetition rate diode-pumped solid state laser and CW output fiber laser is required. These lasers are used for several applications such as annealing process of solar cells and frat panel displays or cutting and welding for metal materials. A 317 W average-power SHG from 61 J at 10 Hz with 52% conversion efficiency output diode-pumped Yb:S-FAP laser was reported by using a YCOB nonlinear crystal with aperture of 5.5 x 8.5 cm2 [3, 9, 10]. This paper reports calculated evaluation of frequency doubling of 1 kJ at 10 Hz class laser by a CLBO nonlinear crystal
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