抄録
As developing laser technology, lasers have come to be used for various applications such as chemical
analysis and material processing. In addition, the expectation for higher power laser becomes strong due
to expanding the application range. On the other hand, as the output power of the laser becomes higher,
higher light resistance is required for the laser crystal, wavelength conversion crystal and fiber which
constitute the laser. In this paper we have investigated an approach to increasing the output power using
a quasi-phase-matched wavelength conversion element. In particular, special attention was paid to the
heat generated in the crystal as output power increased. The maximum output power is limited by the
influence of this heat, and due to overcoming it we have developed an exhaust-heat wavelength conversion
module that efficiently removes heat. we demonstrated stable 15 W green power in CW single-pass
conversion.
