Experimental Study On 515nm All-solid-state Laser

In recent years, the use of diode lasers and all-solid-state lasers in bioanalytical technology, as alternatives to gas lasers, has grown increasingly popular. For all-solid-state lasers with different wavelength, there is one important gap around 515nm. The peak emission of Yb3+:YAG crystal is 1030nm, and the second harmonic generation is 515nm. However, in Yb3+:YAG crystal, there is great re-absorption around 1030nm, which makes it hard to oscillate under small pump density. By far, reports about 1030nm laser mainly concentrate on high and middle power level, and study on Yb3+:YAG laser under low pump power is usually about 1050nm.This paper analyzed and discussed the property of Yb3+:YAG crystal, as well as components and related technology in all-solid-state laser. An experimental 515nm all-solid-state laser was designed and constructed using Yb3+:YAG crystal. Proper concentration and length of laser crystal, transmission of the output mirror were chosen to achieve the 1030nm laser. And 515nm second harmonic generation was achieved by using a LBO crystal at the type-Ⅰphase-matching. The output power was 180.7mW and optical-to-optical conversion efficiency was 2.49%, when the absorbed pump power was 7.26W and the temperature of Yb3+:YAG crystal was controlled at 24℃.