The Quality Group Of Green Laser Pointer Will Analyze The Quality Problem Centrally

As the eye of the special relationship between the anatomy and specific physiological, retinal laser eye injury and incident angle are closely related. The reason is the eye itself as a condenser lens system, and depending on the incoming laser beam into the eye parallel to the axis, the recess in the central macular area focused to a small spot, the energy density higher than the cornea at 3 to 4 times , so the laser direct eye is very dangerous. Pigment organization very easy to absorb the laser energy, therefore the more pigment content, the degree of absorption of the laser intensity, the greater the degree of damage suffered. Eye tissue to absorb more than its own threshold energy after injury will hurt. More than by the more severe the injury. The quality group of green laser pointer will analyze the quality problem centrally.
M3 mirrors with adjustable output of the laser beam orientation acousto-optic modulator, the beam incident to the Brewster angle and optical media through the middle of the sound. Remove the M3 mirror, so that the beam transmission through the modulator in the mask at last. Gradually add the modulator electrical power, observed Raman - Nuys diffraction phenomenon, under normal circumstances can be observed on the mask at 0, ± 1 级, ± 2-order diffraction light. If the diffracted light intensity asymmetry, adjustable stand next two quadrature modulator leveling screws, the measured diffraction efficiency of the beam 0 (or modulation) and electric power curve. The electric power on the modulator to 0, according to the geometric cavity length L placed mirrors M1 and M2, M2 mirror as close as possible and to acousto-optic modulator. The laser output with adjustable mirror M3 M2 mirror, the beam returns along the same route. Then in the M2 mirror to see the spot on the increase and changes associated with flash intensity. Remove the M3 mirror, in M1 and M2 can be formed between the laser oscillation. Fine-tune the M1, M2 screws on the frame so that the maximum output power. The company will import the advance innovative concept of 100mW green laser pointer.
On the modulator with appropriate electrical power, usually laser power will decline, and then fine-tune the M1, M2 screws on the frame, as the laser power increased, if the cavity length of the right, then the laser cavity may have formed a lock mode oscillations. D1 observed with the receiver mode-locked laser pulse train. Value in the geometry near the cavity length changes the cavity length, carefully move the M1 mirror to observe the changes in mode-locked pulse, the cavity length to find the best clamping position, and draw mode-locked laser cavity length adjustment of the precision requirements. Pulse period and pulse width measurement, and compared with theory, analysis of error causes. Observed with a scanning 50mW green laser pointer interferometer output longitudinal mode spectrum, and compare the changes in the spectrum before and after clamping (longitudinal mode number, strength and stability), the scanning interferometer see the performance and use of experimental "He-Ne laser modes analysis "of the relevant sections. Figure 12 shows the experimental setup to achieve this clamping, the use of scanning laser interferometer system to obtain the frequency spectrum of mode-locked, lock about 30 longitudinal modes. Change on the acousto-optic modulator input power, observe the effects of mode-locked state, to find the best mode-locked and response to electrical power and zero-order diffraction sound power transfer system. The information process of green laser pointer is helpful to the site management of 200mW green Laser Pointer workshop.