Ultrashort pulse laser oscillator

摘要

For the sake of no needing to provide a mechanically actuating section such as a rotating mechanism thereby to be capable of realizing stable ultrashort pulse laser oscillation, an ultrashort pulse laser oscillator comprises a laser resonator composed of a mirror on outgoing side, and a total reflection mirror; a continuous wave oscillation laser for inputting excitation laser beam; a tunable laser medium capable of laser oscillation; a photoacoustic optical crystal having birefringent property as a crystal for selecting wavelength to which is input outgoing light from the tunable laser medium; a piezoelectric element inputting an acoustic wave having a frequency in response to a distortion upon application of voltage; a power source for applying the voltage; and a control means for controlling a frequency of voltage to be applied to the piezoelectric element by the power source wherein a frequency of voltage to be applied to the piezoelectric element by the power source is controlled by means of the control means, whereby the voltage having a frequency conforming to a distance defined between the mirror on outgoing side and the total reflection mirror is applied to the piezoelectric element by means of the power source, besides laser beam output from the mirror on outgoing side is utilized as outgoing laser beam from the laser resonator.