In today's society, the compact and easy-to-use high power laser pointer has been widely used in conferences, teaching, museum visits, mountaineering, building inspections and other places as a light source for indication, and has a large market sales all over the world. The main structure of the green laser pointer is a miniature solid-state laser pumped by a laser diode (Laser Diode or LD). One is solid-state laser combined with nonlinear frequency doubling technology—such as Na:YAG+KTP frequency doubling, with a wavelength of 532nm. Green light has a wide range of uses not only in medical, display, entertainment, underwater, and storage, but also in pumping, biological, and material processing.
Obtain 534nm to 540nm green laser pointer light source
Gas lasers are the earliest means to generate green laser pointer, but the application of green laser pointers is greatly limited due to gas leakage, attenuation, and huge power and water cooling systems. Along the back cavity mirror of the resonator, the potassium titanate arsenate crystal and the Stokes output mirror exit, the exciton scattering process of the potassium titanate arsenate crystal constitutes the Stokes light source, changing the pump light incident Stokes The angle of the resonator can realize the tunable output of Stokes light, and the tunable Stokes light in the range of 1077.88nm to 1089.02nm can be obtained through angle tuning. The frequency doubling system includes a frequency doubling crystal and a filter, and by frequency doubling the Stokes light source, a green laser pointer light source in the range of 534 nm to 540 nm is obtained.
In the late 1980s, with the major breakthroughs in crystal materials and laser diode technology, solid-state lasers developed rapidly, and their application fields continued to expand. Laser diode (LD)-pumped all-solid-state pulsed green lasers have the advantages of small size, high conversion efficiency, good beam quality, high stability, and long life, and are widely used in laser material processing, laser color display, laser medical, military Confrontation, underwater exploration and other fields.