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The line filter belongs to the components of  green laser pointer
The increase in small size, light weight and low-cost near-Earth satellites (LEO), as well as the development of the key technologies and components, laser communication applications gradually extended to the LEO-LEO, LEO-GEO and LEO- ground stations and LEO-plane optical communication link. The representatives of NASA’s laser communications demonstration system LCDS (Laser Communication Demostration System), the main bearing unit Bell Aerospace, ThermoTrex (Tektronix), Comsat Laboratories, Doedalian technology companies, Motorola and Artin Maritta companies participating units. The sales plan of green laser pointer  should be modified.
The purpose of the study there are two, First demonstrates two movements between platforms and between the platform and the ground of high bit rate optical communication connection; is demonstrated in the future of satellite communications, laser communications and radio communications compared in advantages of performance, size, weight, power and transmission rate. The system technical requirements at least one communication terminal in space, completed in mid-1995 developed 1998 first flight test, the rate of 750Mbps data transfer. LCDS system applied to problems in the satellite link are: inter-node distance duplex communication satellite link network; wide-angle optical targeting positioning; high-speed high bit rate communication. The supply management of green laser pointer means planning.
Clouds and rain in the upstream and downstream communication link dispersion and attenuation. NASA to encourage industry participation in the development of laser satellite communications technologies, has entered into two contracts with industry, the tasks include estimating future space laser satellite communications market, the development of laser satellite communications plan (including a public space and launch vehicles) of the satellite, and developed a laser satellite communications program. The purpose of the two contracts is the development of laser satellite communications market, and is ready for commercial satellite communications network in the future. NASA also some key technologies of the free-space laser communication and presentation system at the same time, the main light communication demonstration system of OCD (Optical Communication Demonstration), air-to-ground demonstration system, TOPSAT (TOP graphical mapping Satellite) system, atmospheric visibility monitoring Program (AVMP). The organizing of green laser pointer  should be considered.
In addition, NASA also conducted a number of key technologies: the development of small-aperture optical antenna; high power laser source and the modulation method; near the quantum limit, high sensitivity receiver; fast and accurate 16 key data relay satellite technology – laser communications ATP (Acquisition, Tracking, Position) technology. Also, NASA Jet Propulsion Lab (JPL) developed a laser satellite communications plan, including the development of high-energy (3.5W) Nd: YAG laser communications equipment, device is equipped to save the image function narrowband laser filter. The coordinating of green laser pointer  has to be made.