LITTLE KNOWN FACTS ABOUT LASER CRYSTAL.

Seen sound-state lasers based upon laser crystals are compact and light. Lasers from deep purple to blue happen to be described. Especially, there have been a great deal of stories on Pr3+ doped laser crystals, and steady wave lasers all over 490 nm are achieved. Ti∶sapphire is the key achieve crystal for ultrafast lasers. Superintense ultrafast