The mouse was invented in 1964 by Dr. Douglas Engelbart of the University of California at Berkeley. For more than 50 years, the mouse has become an indispensable item in people's lives and work.
It is reported that the University of California, San Diego (UCSD) researchers have developed a new laser material - Nd-doped alumina crystals, capable of emitting ultra-short (theoretically as low as 7.7 fs), high-power
Space laser communication mainly uses laser as a carrier to load information onto the laser and transmit it in free space such as outer space. At the receiving end, information transmission and communication can be reali