We report an upconversion laser that is pumped by two colors—one red and one near infrared—and emits in the blue-green region.
© 1989 Optical Society of America
Dinh C. Nguyen, George E. Faulkner, and Michael Dulick, "Blue-green (450-nm) upconversion Tm3+:YLF laser," Appl. Opt. 28, 3553-3555 (1989)