Shimadzu Corporation

Satoshi Irikuchi

Koji Tojo

Naoya Ishigaki

Kazuma Watanabe

Ichiro Fukushi

Koji Inoue

Tunehiro Sugimoto

Masaru Koeda

Ryo Tateno

The transmittance of an etalon relative to an oscillating line having the wavelength of 1061.6 to 1062.2 nm by an Nd:YAG laser mediumis set to 0.9 or lower (the maximum value of the transmittance is 1.0). The oscillating line of the wavelength of 1061.6 to 1062.6 nm is damped by the etalon so that a peak corresponding thereto does not substantially appear in an outputted laser beam. Accordingly, a longitudinal mode can be preferably changed to a single mode and an output can be stabilized.

Solid state laser device

A solid laser apparatus has either a combination of a lowpass filter () and a highpass filter () or a bandpass filterprovided in its output control circuit () for increasing the gain and adjusting the phase of a signal in the vicinity of the relaxation oscillating frequency. Also, a solid laser apparatus has the phase shift circuit () provided in its output control circuit () for advancing the phase of a signal in the vicinity of the relaxation oscillating frequency thereof. Moreover, a solid laser apparatus has a pseudo notch filter (), which is arranged for the gain to have a local minimum at the relaxation oscillating frequency of the solid laser apparatus, provided in the output control circuit () so that the peak of the gain transmission characteristic of the nonlinear optical device () or of a combination of the nonlinear optical device () and the microchip laser crystal () is offset.

Solid laser apparatus

A solid laser apparatus has either a combination of a lowpass filter and a highpass filter or a bandpass filter provided in its output control circuit for increasing the gain and adjusting the phase of a signal in the vicinity of the relaxation oscillating frequency. Also, a solid laser apparatus has the phase shift circuit provided in its output control circuit for advancing the phase of a signal in the vicinity of the relaxation oscillating frequency thereof. Moreover, a solid laser apparatus has a pseudo notch filter, which is arranged for the gain to have a local minimum at the relaxation oscillating frequency of the solid laser apparatus, provided in the output control circuit so that the peak of the gain transmission characteristic of the nonlinear optical device or of a combination of the nonlinear optical device and the microchip laser crystal is offset.

In producing an etalon, a thickness of an etalon base plate is measured, and the etalon base plate is placed in a process chamber. Then, a gas having a chemical reactivity with respect to a material of the etalon base plate is introduced into the process chamber, and a surface of the etalon base plate is etched for only a predetermined time corresponding to a thickness of the etalon base plate, thereby obtaining the etalon having a desired thickness.

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Atsugi, Japan

Satoshi Irikuchi