Technology of green laser pointer is more advanced

Technology of green laser pointer is more advanced and complicated. 
In general, the higher the damage threshold of the material, the higher the harmonic conversion efficiency of the nonlinear crystal. High peak power laser compared with traditional laser pulse

energy (tens of mJ, and even a few joules), short pulse width (from femtosecond, picosecond to the subnanosecond and nanosecond or so), higher peak power ( MW, and even the GW), the more difficult

and other characteristics. These lasers in laser processing, the flow field shows that ocean exploration, optoelectronic countermeasures, laser medicine, atmospheric monitoring, laser

communications, harmonic transform, X-ray lasers, free electron accelerators, inertial confinement fusion [3], ultrashort pulse-doped titanium sapphire tunable lasers and other areas of year-on-

year has more advantages. The wavelength of the laser light of green laser pointer contains 473nm which emits pure blue laser beam. 
Through the use of pulse LD after fiber-coupled end-pumped Nd: YAG or Nd: YVO 4 through of Cr: YAG and other passively Q and further shorten the cavity length, and other methods to achieve the end

of the high repetition rate pump microcavity subnanosecond laser output. Specific optical path as shown in Figure 7. Where S1-plated 808 AR, 1064 Gao anti; S2, plated 1064 part of the output.

Figure 7, the end pump micro-cavity Mariana second laser light road-side pump cavity passively Q to achieve the advantages of subnanosecond laser output is a simple structure, the whole of a small

pulse width is shorter; but because of the passive Q-bleaching characteristics, prone to low injection pulse. The combined pulse LD side pump chamber to empty the output of nanosecond pulse, as

shown in Figure 8. Some green laser pointer are suitable to being used by the teacher, lecturer or stargazer for pointing or highlighting purpose.
Cavity-dumped easily achieved in conditions of high injection energy, short pulse output. However, because the cavity length is an important factor to affect the pulse width [9], it is necessary to

shorten the cavity length, but also to ensure spot mode, the cavity design has some difficulties. Ultrashort pulse lasers. Practical ultrashort pulse lasers are generally mode-locked seed sources,

regenerative amplifier. Which clamping the output of the seed source is satisfied that the focus order of magnitude of ultrashort pulses, as shown in Figure 9, after the Faraday isolator injected

into the regenerative amplifier menus and power amplifier in Figure 10, and then through the empty output polarizer P3, the regenerative amplifier generally can be enlarged to more than the energy

level of mJ. Energy further amplification, coupled with the power amplifier in the regenerative amplifier output. Some green laser pointer are used to point to or highlight something.
Figure 9 LD End-pumped picosecond mode-locked seed sources in Figure 10, the regenerative amplifier optical path diagram.