Quasi-continuous wave laser operation of Cr4+-doped Y2SiO5 at room tem
perature was demonstrated for the first time. When pumping with a Nd:Y
LF laser at 1047 nm, laser operation at 1304 nm with a threshold of 1.
5 W was achieved. Room temperature laser operation by pumping with a l
ong pulse flash lamp pumped Nd:YAG laser was also obtained.