Research On All-Solid-State491nm Blue Laser

Blue laser own its incredible significant position in many different special fields for its short wavelength, but compared with red and green laser, the low-level development of blue laser limited its using on applications, for now, people obtain high power blue laser mainly by LD pumped Nd3+doped laser crystals to produce0.9μm near infrared laser, then using nonlinear frequency conversion technology to grab blue laser. But base on the situation that fundamental frequency laser of0.9μm near infrared wave generally come from quasi-three level system, which has high threshold and low conversion efficiency. for such reason that was petty difficult to achieve blue lasers with high efficiency and output.This paper is mainly about to obtain491nm blue laser by making use of intracavity sum-frequency operation on1064nm laser and912nm lasers in one LBO. By choosing a Nd:GdVO4crystal to emit912nm laser and a Nd:YVO4crystal to operate1064nm laser. The two lights are respectively realized by four-level system and quasi-three level systems. The non-linear LBO crystal was cut under the standard of room temperature type Ⅰ phase matching(θ=90°, φ=16.6°).This paper detailed studied on the threshold, efficiency and output power of four-level system and quasi-three level systems, and the analysis of the theory of non-linear frequency conversion. Finally according to the theoretical analysis and experimental schemes, a maximum output blue power of116mW was based on two separate cavities linked in a common arm with two different laser crystals.