| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser beam with a narrow wavelength width stably with a simple low-cost configuration. SOLUTION: The external resonance type laser includes a laser oscillator for casting a laser beam with a prescribed wavelength and an external resonator for resonating the laser beam cast from the laser oscillator. A photopolymer volume hologram is provided in the resonator. The laser beam cast from the oscillator is diffracted by the photopolymer volume hologram and cast as an incident beam into an optical system in the resonator. Then, the laser beam with a prescribed wavelength is transmitted selectively through the photopolymer volume hologram and cast outside.
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