Tunable deep ultraviolet single-longitudinal-mode laser generated with Ba(1-x)B(2-y-z)O4Si(x)Al(y)Ga(z) crystal

We report a new nonlinear crystal, Ba(1-x)B(2-y-z)O4Si(x)Al(y)Ga(z), and employ it to a compact 1 kHz single-longitudinal-mode Ti:Sapphire master oscillator power amplifier system for fourth harmonic generation. A maximum output power of 130 mW is obtained in the tunable range of 195-205 nm with linewidth of less than 0.1 pm.