LITTLE KNOWN FACTS ABOUT LASER CRYSTAL.

Seen solid-condition lasers according to laser crystals are compact and light-weight. Lasers from deep red to blue have already been claimed. Particularly, there were plenty of reports on Pr3+ doped laser crystals, and constant wave lasers all-around 490 nm have already been reached. Ti∶sapphire is the principle gain crystal for ultrafast lasers.