Ld Pumped 532nm Green And 355nm Uv Laser Research

LD-pumped all-solid-state laser technology utilizes laser diode or array-pump laser gain medium (such as Nd:YAG, Nd:YVO₄, Nd:GdVO₄, Yb:YAG,Tm,Ho:YVO₄, etc.) to produce a fundamental frequency light. Then the fundamental frequency light by the non-linear optical frequency conversion crystals (such as KTP, LBO, BBO, PPLN, PPKTP, etc.) and nonlinear optical frequency conversion technology of doubling frequency, sum frequency, deference frequency and quasi-phase matching, obtains infrared-visible light-ultraviolet wavelengths laser output. This dissertation has made theoretical analysis and experimental study on LD-pumped all-solid-state lasers. In theory, on the basic of recalling the development of all-solid-state lasers and nonlinear optical frequency conversion technology, the ultra-violet-visible light-infrared light laser access methods , application and progress are simply explored, and the theory and technology of nonlinear optical, optical resonator and Q-switched is analyzed. In the experiment, a cooling system basing on combination of water-cooled and air-cooled of LD end-pumped continuous green laser, LD side-pumped 1064nm pulse laser and electro-optic Q-switched 532nm/355nm pulse laser are studyed. The experimental content of main work and innovation can be summarized as follows:1. The cooling system basing on a combination of water-cooled and air-cooled is designed. It is small size, high efficiency, good stability, low noise, and has the advantage of water-cooled and air-cooled in favor of high-power laser miniaturization.2. Through the system cooling laser crystal and frequency-doubling crystal, using end-pumped Nd: YVO₄ and intracavity KTP frequency-doubled, stable continuous green laser output is acquired. When the crystal absorbs the pump power of 24.3W, 4.2W of 532nm stable green laser is acquired, light-optical conversion efficiency reaching to17.3%.3. The theory of pulsed laser output power of the best transmission is analyzed. By 1064nm laser experiment, 60% of 1064nm the best transmittance laser is fixed, geting up to 102.7W laser output without electro-optic Q-switched device, 23.6W pulse laser output with it.4. Side-pumped electro-optic Q-switched green laser is designed with the plane-plane straight extra cavity doubling frequency. When the pump current is 120A, we obtain the highest green output power of 3.62W, 1064nm to 532nm of conversion efficiency of 15.3%. and found intracavity frequency doubling the output power is relatively low.5. ByⅡtype KTP frequency-doubling crystal and theⅡtype LBO deferent frequency for critical phase matching of external cavity, when electro-optic Q-switched repetition rate is 600Hz, the highest average power of 375mW, pulse width of 12ns, single pulse energy of 0.625mJ and peak power of 52.1kW of 355nm UV pulse laser is obtained.Finally, the cavity design, the lens coating selection, frequency-doubling crystal and sum-frequency crystal selection, electro-optic Q-switched, Q-switched crystal, and power supply design are analyzed, which urges the laser of high-power, high stability and the high beam quality to improve.