The material of laser pointer increase in the cost

The material of laser pointer increase in the cost.
Cleavage caused by the randomness of the cleavage surface of the light field phase. SLM yield (<80%). A / 4 phase shift method is to eliminate the above power threshold gain degeneracy is an effective method, but requires that the residual reflectivity of AR cleavage plane below the 10 negative cubic Otherwise, the lower yield of the SLM. This method is also prone to the spatial hole burning effect due to the unstable single-mode, and after the end of the output power is used effectively. As early as 1972 the Krono Nick, and the Hong grams prophesied gain (rather than the refractive index) cycle of the so-called gain coupling (GC) DFB lasers can accurately Bragg lattice wave length of the SLM oscillation. The purchase of laser pointer should be performed strictly.
Because the wave length of the laser divergence angle in the same transmit beam and receiver field of view requirements, the transmitting and receiving telescope diameter can be smaller. Laser communication to get rid of a huge dish antenna of microwave systems, weight and size can be reduced a lot of satellite communications is very favorable. high degree of confidentiality laser with a high degree of directional transmit beam slender and able to transfer large amounts of data in a short period of time, thereby reducing the continued communication time. satellite laser communication has a high degree of confidentiality and anti-jamming, can effectively prevent eavesdropping and detection, have a greater significance for both military and civilian satellite laser communication system, beam divergence angle is 10rad. The purchase of laser pointer should be well managed.
But did not launch, LCS plan was canceled in 1993. Another laser of the U.S. Department of Defense satellite communications plan is implemented by the McDonald Douglas, began known to boost the level tracking system (BSTS), later the Air Force was renamed the track for the early warning system (FEWS), the scheme is also 1993 The end of the year was canceled. Strategic Missile Defense Organization (BMDO) is the U.S. Army Space and Strategic Command Ministry under the leadership of the development of a laser communications terminal equipment. Engineering test model has been developed, and put them between the two apart 42km mountain, the signal transmission rate of 1Gbps, the bit error rate of less than 10-6, and was tested in all weather. The material of laser pointer increase in the cost.Troubles of laser pointer happen in the operation of laser pointer