| 摘要 |
PURPOSE:To prevent a laser beam from deteriorating in quality by a method wherein an effective velocity of light inside an optical resonator is made to change through the change of a refractive index due to the distortion inside an electrostrictive element by changing the voltage applied to the electrostrictive element and the wavelength of an oscillating beam of a dye laser oscillator is made to change continuously. CONSTITUTION:An etalon 2 executes a fine adjustment of the wavelength of oscillating laser rays on an optical axis of a diffractive grating 6 and an output mirror 5. A beam magnifier 3 magnifies a laser beam so as to use a large area of the diffractive grating 6 as effectively as possible. A light transmissive electrostrictive element 10 continuously and finely adjusts the wavelength of the oscillating laser beam taking advantage of the change of a refractive index through varying the applied voltage. A dye cell 4 makes a die solution, which serves as a laser medium, flow. A voltage is applied from a power source 14 to the element 10 through the intermediary of electrodes 11, and a laser oscillation frequency can be changed through the change of a refractive which follows the change of the applied voltage. By this setup, the wavelength of oscillating laser rays of a dye laser oscillator can be continuously changed, so that a laser beam can be prevented from deteriorating in quality. |
