A laser pointer is a tool that uses a high power laser pointer. The length that can be indicated is relatively far, and it can be used instead of pointing tools such as pointers, and can also be used as an instruction when playing slideshow ppt. Most of the current laser pointers are red, green and blue are less, and they are expensive. Fiber lasers have significant advantages such as low laser threshold, good output beam quality, high conversion efficiency, high "surface area/volume" ratio, good flexibility and flexibility, and easy integration. In recent research on pulsed fiber lasers, the wavelength is mainly Focusing on about 2.8um, the main methods used are gain modulation, active Q-switching of acousto-optic modulators and passive Q-switching of saturable absorbers. 1. The gain modulation method is to periodically modulate the number of particles at the upper energy level of the laser transition by means of pulse pumping to achieve the pulse output of the laser, but this method requires pulse modulation of the pump light, which is easy to damage the pump laser. and fiber end faces.
Adjust the height of the green laser pointer
The working principle of the laser pointer is that it consists of an RF radio frequency remote control and a receiver (USB interface). It can work normally without installing the driver, and the user only needs to click the relevant function keys of the RF radio remote control to operate the receiver. And the transmitter does not need to be aimed at the receiver, which truly reflects wireless freedom. Due to the high brightness, high directionality and sensitivity of the green laser pointer to the human eye, it has a great potential danger to human eye safety in daily applications. Therefore, many developed countries in the world (such as the United States, Australia, etc.) All clearly stipulate that "green laser pointer is not a toy", its power must be lower than 5mW, preferably lower than lmW.
An extra-cavity resonance ultraviolet laser generating device includes a second harmonic system and a fourth harmonic system located on the same collimated optical path. Among them, the second harmonic system is an all-solid-state laser structure, and the fourth harmonic system is an extra-cavity resonance structure, which is mainly composed of a 532nm optical isolator, a fourth harmonic front-end dichromatic lens, a fourth harmonic nonlinear optical frequency conversion crystal and The 4th harmonic rear end dichroic lens is composed; the 532nm optical isolator is placed on the output end of the second harmonic system collimating optical path; the fourth harmonic FP resonant cavity is formed by the fourth harmonic front and rear end dichroic mirrors Located behind the 532nm optical isolator, the fourth harmonic nonlinear optical frequency conversion crystal is located in the fourth harmonic FP resonator.