Green laser pointer has the strong and powerful features and functions

The mode selection: fixed cavity may inspire the transverse mode and cavity structure, loss of size and level of incentives and other factors are closely related. Low order modes with smaller beam divergence angle corresponding to, so a single fundamental mode output must be taken to the transverse mode selection techniques. Transverse mode selection methods can be divided into two categories: one is inserted in the cavity additional mode selection component to improve the performance of the selected mode, the available small aperture beam expander telescope to achieve; the other is to change the resonant cavity structure and parameters in order to obtain a larger difference of the diffraction loss, improve the performance of the cavity mode selection, the unstable resonator mode selection. This experiment holes election mode. Stargazers should not use green laser pointer frequently.
Preparation: the necessary components (<collimated light (650nm) from left to right> semiconductor, small aperture, the totally reflecting mirror, Q crystals, polarizers, of Nd3 +: YAG laser rod, the output mirror, the frequency-doubling crystal, spectral prism); system power supply; cooling system; triangular rail and base. Semiconductor collimated light (650nm), 2 small aperture. Totally reflecting mirror, 6.Nd3 +: YAG laser rod (Ф6 * 100mm), 7. Output mirror 8. Frequency doubling crystal (KTP), 9 beam splitter (K9 glass as a substrate, 60 °) The quality of the optical path adjustment is directly related to the effect of light regulation, and can generally be light, a great help for the following experiment. Stargazers should not disturb others stargazing by usinggreen laser pointer frequently.
The adjustment of the laser. Tune collimated light: semiconductor switched quasi-direct light source power, small aperture close to the collimated light at Jiang Hongguang is through the hole, then the diaphragm to pull away, adjust the collimated light level and pitch knob in so that the collimated light passing through an aperture holes, repeated several times on the process anywhere on the rail until the small aperture collimated light passing through an aperture holes. Note: stick height not lower than the center of the bar, preferably higher than 4-5mm, plus polarizer optical path under partial. Adjust the bar height: to emphasize stick close to the collimated light side, so that the collimated light point stick center or slightly higher, and then transferred to the remote, so that the reflection like back in the small aperture holes. Using green laser pointerin public places should be prohibited, too.
Uniform force to tighten the screws, always concerned about the reflected image, to ensure its return to the holes and tighten the screws. Adjust the output environment and mirrors: the first mirror is placed near the diaphragm out, so the 650mm collimated light passes through the center of the reflector, and its reflection like back to the aperture holes, and then the totally reflecting mirror away from the aperture Repeat the above steps, like Back to the diaphragm holes anywhere on the rail until the totally reflecting mirror, its reflection, and finally the totally reflecting mirror placed near the diaphragm place, tighten the lock knob. Regulation of the output mirror cohomology mirror Finally, the output mirror is fixed to the rod remote. Adjust the polarizer and the Q-switch crystal: the polarizers requires a certain distance (about 10mm) away from the rod end, the collimated light through the polarizer Center. Some high powergreen laser pointerhave an obvious heating effect.
Mediation frame with the bat as far as possible perpendicular to the (visual), the polarizer is fixed to the bar front end. Q-crystal is collimated light through the center of the crystal and its reflection like as much as possible back to the diaphragm hole center, and finally fixed between the polarizer and reflector. Regulation of frequency doubling crystal: The method is similar to the adjustment method of the Q-switch crystal, to try to make the collimated light passes through the center of the frequency-doubling crystal, the output mirror is fixed at the back. Output mirror, totally reflecting mirror, the polarizer is generally one week cleaning time, the Q-switch crystal cleaning difficult, usually with long-staple cotton graze or wash the ear with the ball blowing. Some green laser pointer should also be forbidden for a long time continuous use.