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Green light has been popularized in recent years, and technology has advanced by leaps and bounds. Domestically, it has achieved tremendous development. Although it has become popular in foreign countries, the level of awareness in the domestic market is still very narrow. Many friends actually feel very strange to this product. I do not know green laser light. There is no use whatsoever and even more puzzled about the working principle of this product, it does not matter! Fibrino-green boutique staff will be able to explain some of this knowledge in the future. This article mainly explains the principle of its production.

All semiconductor lasers are generated by laser tube focusing. The difference between green and red light is that the green light does not directly emit green light. It can only be converted by crystals, and then it is expanded and collimated to produce well-focused green light. Start with crystal understanding: Crystals (Nd:YVO4+KTP)

The Nd:YVO4 crystal is one of the most effective laser crystals currently used in laser diode (LD) pumped all-solid-state laser working substances, and its excellent performance includes stable chemical and physical processability and a lower laser threshold. Due to the large stimulated emission cross-section, high slope efficiency, and wide pump light absorption efficiency, the Nd:YVO4 crystal has become more and more widely used. Recently, the high-power, high-stability infrared and green lasers produced by the combination of the crystal and KTP crystal have been industrialized and widely used in market lighting.

KTP (potassium titanyl phosphate) crystal: KTP crystal is one of the most comprehensive crystals in many nonlinear crystals at present. Its large nonlinear coefficient, high light damage damage threshold and stable chemical properties are very high. The frequency conversion efficiency (>70%) and relatively low cost make it the best in the application field of this type of crystal, and it is durable, especially in the application of 1064nm laser frequency doubler device, KTP is the best Crystal material. LD(808nm)+Nd:YVO4 get 1064nm+KTP to get 532nm green laser.

The green light module is composed of a laser crystal and a nonlinear crystal. In the laser resonator, the LD pump light of 808 nm wavelength is used to generate a 1064 nm laser beam through the gain of the laser crystal, and then undergoes the frequency doubler effect of the nonlinear crystal. Can produce 532nm green laser. The green light module is similar to the integrated circuit in the electronic component, has the characteristics of modularization and integration, and can be mass-produced and reduced in cost.

The green light module adopts the more popular photo-adhesive technology in the production method. Compared with the adhesive, there is no optical gap in the bonding surface, the green light output power is high, the output mode is good, and the spot strobe light is low, and continuous and stable output can be achieved; In the 20OmW diode pumped condition, the crystal size is 0.8X0.8X2, and the output green power is generally 5-10mW. In addition, the conversion efficiency has a great relationship with the quality of laser diodes and crystals. Currently the most advanced technology and materials in the market. , conversion efficiency up to 35% or more.

The green light module is extremely convenient when making a laser resonator, and thus becomes a core component of a laser diode pumped all-solid-state laser (DPSSL). DPSSL has the advantages of compact structure, high energy conversion efficiency, high power, good beam quality, long life, easy to use, etc. It is one of the main devices to produce low power green lasers, in color display, laser entertainment, laser medical, underwater communication Other aspects have important applications.