The receiver of the wireless presenter Laser Pointer is small

The receiver of the wireless presenter  Laser Pointer  is small, exquisite and aesthetic.
The output mirror is fixed in the four-dimensional adjustable shelves. Adjust the output mirror to make the return points of light through the black and white holes. For a certain curvature output mirror, there will be a few spot, should distinguish the return to the spot from the center of the sphere. Pumped semiconductor laser conditioning. Switched semiconductor laser adjustable power supply, the current adjustment knob clockwise to the maximum. (Note: the shutdown should be counter-clockwise to the minimum). A little flip up and down the output mirror, resulting in a 532nm green laser. Adjust the output mirror, adjust the LD frame, 532nm green laser power. Rotating KTP crystal dial, measuring the phase-matching angle. For the green laser technology of  Laser Pointer  is more complicated and the cost of the green laser pointer is higher.
Overall, the semiconductor laser waveguide structure has led to the severe asymmetry of the far-field beam. Fast axis direction that is the output of the fundamental mode, good beam quality, divergence angle, the fast axis divergence angle compression can effectively reduce the fast axis collimation lens aperture. The slow axis of the multimode output beam quality and reduce the divergence angle of the direction of improved device beam quality, high-beam semiconductor laser research areas focus of attention. Fast axis divergence angle control, how to balance the fast axis divergence angle and electro-optical efficiency has been the research focus of the field, despite a number of research institutions continued with the fast axis divergence angle of only 3o, even 1o of the device. The emitter of this kind of  Laser Pointer  does not need to point to the receiver of the wireless presenter.
But consider the cost of power, photovoltaic efficiency and preparation, difficult to promote short-term utility. In early 2010, Ferdinand - Germany Berne Institute (Ferdinand-Braun,-Institute), P. Crump In, etc. through the use of large optical cavity, the method of low-limiting factor 30o fast axis divergence angle (95% energy range), the photoelectric conversion efficiency 55%, reaches the standard of practical devices. The energy range of about (95% of the commercial high-power semiconductor laser device of the fast axis divergence angle from 80o) reduce to below 50o, a significant reduction in the fast axis collimation lens numerical aperture. The remote of  Laser Pointer  which uses the radio frequency technology is embedded with the wireless radio frequency emitter.