All-Solid-State Near-Infrared and Blue Femtosecond Laser System

We investigate an all-solid-state continuous wave (cw) green (532 nm), femtosecond near-infrared (823.1 nm) and blue (402 nm) laser system which is pumped by a diode-laser-pumped intracavity frequency-doubled and all-self-structuring cw Nd:YVO₄/KTP 532 nm green laser. The cavity parameters of the Nd:YVO₄/KTP laser have been optimized and the maximum 5.6 W TEM₀₀ green laser is obtained at a 22 W pump power with an optical-optical conversion efficiency of 25.5%. A Ti:Sapphire laser and the nonlinear second harmonic generation by a crystal BBO is used to obtain different wavelengths. A femtosecond laser with average output power of 300 mW at 823.1 nm and 73 mW at 402 nm is obtained when the green pump power is 2.5 W. The spectral full width at half maximum are 32.3 nm and 5.1 nm, which can sustain the pulses of 22fs and 33.3 fs, respectively.