Technical principle of adjustable brightness green laser pointer
Laser Pointers are widely used in teaching demonstration, astronomy guidance, conference guidance and other fields. Green laser pointer is widely used because of its high brightness and bright color. In general, different applications require different laser Pointers of different brightness. The green light power required for teaching demonstrations is l_5mW, and the brightness required for astronomical indications is over tens of milliwatts. A hundred milliwatts. At present, the core of the green laser pointer uses a 532nm microchip laser as a light emitting element, powered by a PCB board. The principle is to drive the 808nm LD by current, and then output the 808nm laser as the pump source to pump the cemented crystal. The cemented crystals are composed of NchYVOjP KTP crystals. The disadvantage of this construction is that once the resistance of the PCB board is fixed, its output current is fixed, so its output performance is fixed. In addition, because the 532nm microchip laser is sensitive to temperature, when the ambient temperature changes, if the output current of the PCB board remains unchanged, the output optical power of the laser pointer will change significantly.
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A green laser pointer with adjustable brightness, including a shell, a battery, a spring pad, a PCB board and a green laser module are installed in the shell; The positive pole of the green laser module is connected with the Laser pointer shell, and the negative pole group of the green laser module is electrically connected with the negative output of the PCB board; It also includes a variable resistance regulator and a variable resistance. The PCB is provided with a variable resistor. The first pin, the second pin and the third pin of the variable resistance are respectively fixed on the corresponding potentiometer pad on the PCB board; The variable resistance is electrically connected with the variable resistance regulator, the variable resistance regulator is placed on the surface of the laser pointer, and through the variable resistance regulator to change the value of the variable resistance. The utility model adjusts the brightness of the output light according to different occasions, and at the same time, adjusts the current PCB board to deal with the phenomenon of no light output and weak light output caused by changes in ambient temperature, so the laser pen has a wider temperature range.
2021-09-27 12:23:31
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