Recent years, researchers have had wide attention on terahertz which has many important applications in front research issues, like radar detection, medical imaging and astronomical observation. 659.5nm/669 nm dual-wavelength laser is well front part of light source of terahertz that can be achieved by difference frequency.659.5nm/669 nm dual-wavelength laser has been studied in this paper by combination of theory and experiment. First, with simulation of output performance of continuous and pulsing dual-wavelength laser, the output of dual-wavelength laser is achieved at ratio of 1:1 in theory. Via calculation and simulation of double-frequency theory, the crystal of LBO is designed for intracavity double-frequency operation to realize red laser of 659.5nm/669 nm. According to the resonator parameter of theoretical design, experiment of continuous and Q-switching output of1319nm/1338 nm dual-wavelength laser is achieved. In continuous operation, the output power of 5.94 W is finally obtained, beam quality M2=1.39, the ratio of dual-wavelength laser power close to 1:1. In Q-switching operation, at the repetition frequency of 10 kHz, the pulsing laser output of peak power of 5865 W is obtained.Finally, 659.5nm/669 nm dual-wavelength laser is realized on the basis of the above work. The output power of 1.3W is obtained, the ratio of power close to 1:1, beam quality M2=1.5. |