| 摘要 |
PURPOSE:To simultaneously output two laser beams of independent and variable wavelength by providing two optical parametric oscillators along the optical axis of an excitation light, and controlling the rotary angle of each non-linear optical crystal. CONSTITUTION:When a wavelength selecting signal is sent out to optical parametric oscillators 24, 25 through lines l1, l2 from a wavelength selecting circuit 45, the rotary angle of rotary shafts 30 and 32, and that of 40 and 42 are controlled to a prescribed angle respectively, and a phase matching angle of a non-linear optical crystal 31, and that of a non-linear optical crystal 41 are set to theta1 and theta2, respectively. Therefore, the oscillator 24 oscillates an optical parametric by the excitation light 22 of wavelength lambdap from a laser oscillator 21, and outputs the light beam 47 of lambda1s and lambda1i. Also, the oscillator 25 uses the transmission light of wavelength lambdap contained in the light beams 47, as an excitation light, executes a parametric oscillation through a collimator lens 37, and outputs the light beams 48 of wavelength lambda2s and lambda2i corresponding to the angle theta2. Also, in the output side of a filter 26, the light beams 49 of wavelength lambda1s and lambda2s appear simultaneously. |
