The red Laser Pointer becomes cheaper and cheaper

 The red Laser Pointer becomes cheaper and cheaper.
Assume that GMES and the International Space Station (ISS), the needs of users is relatively mature, and has identified the scope of its time, giving priority to these two users to provide services. Of EDRS plan long-term goal is to provide adequate global data relay satellite services to the entire ESA user departments (including the carrier rocket and the Galileo navigation system). Common use of the satellite and ESA outside of commercial / government users, and promote the development of satellite data relay services market. With EDRS and the user departments (Earth observation satellites, unmanned aerial vehicles, etc.) the availability of technical solutions to support the standardization and use of optical data relay satellite technology. The low power Laser Pointer are also enough to achieve the goal.Therefore, the semiconductor laser is the best in the low temperature and room temperature. 2 directional short semiconductor laser cavity, the laser directivity is poor in the vertical plane of the junction, the divergence angle of up to 20 ° -30 °; approximately about 10 ° in the horizontal plane of the junction. efficiency and quantum efficiency η = number of photons emitted per second / per second to reach the junction area of electron-hole pairs when the number of 77K, the GaAs laser quantum efficiency of 70% -80%; at 300K, down to about 30% power efficiency η1 = radiation optical power / electric power added to the laser due to various loss, double-heterojunction devices, the η1 when the room temperature up to 10%, and only at low temperatures in order to 30% -40%. spectral characteristics.
The photoelectric effect experiment to make the traditional optical theory to a severe test. The great Albert Einstein in 1905 proposed the light quantum is said to explain the experiment. The idea is revolutionary, just bunches that the particle flow to the speed of light, a light particle carries an energy. Light quanta that be said of the great effects of the Planck quantum. Planck blackbody radiation, with particles of light in the emission and absorption process. Einstein further light with particles in the dissemination process. Light the nature of the fluctuations on the one hand, such as interference, polarization, etc.; the other hand, the nature of the particles, such as the photoelectric effect.The motor rotation angle α can be calculated by the counter count value in another motor of the same scan plane rotation angle β is also measurable. Wrapped around a rod of ruby flash glass tube so that the crystal by the light shining ruby, after flash tube issued rays, issued by the laser, through the strengthening of the optical resonator and regulation, they shot a powerful laser. It will be better if the customer uses this type of laser pointer for 20 seconds and stops for 10 seconds and then continues.