Mitsubishi Heavy Industries Limited

Osaka University

Institute for Laser Technology

Junji Kawanaka

Noriaki Miyanaga

Hiroaki Furuse

Shinya Ishii

Tomoko Saito

Kenji Takeshita

Kazuo Imazaki

Taku Saiki

Masayuki Fujita

Masahiro Yoshida

Koichi Hamamoto

Yasukazu Izawa

Haik Chosrowjan

Takahiro Yamada

A multi-beam combining apparatus includes a phase shifting section, a superposing section, an observing section and a phase control section. The phase shifting section generates a plurality of phase-shifted laser beams by shifting the phase of each of the plurality of laser beams. The superposing section generates a plurality of superposed laser beam by superposing the reference laser beam and each of the plurality of phase-shifted laser beams. The observing section generates interference pattern data of a spatial interference pattern which appears when observing each of the superposed laser beams. The phase control section carries out a feedback control of the phase shifts in the phase shifting section based on the interference pattern data obtained for every superposed laser beam, and thereby sets the plurality of phase-shifted laser beams to desired states.

Multi-beam combining apparatus

A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium.

Laser gain medium and laser oscillator using the same

Growing community of inventors

Osaka, Japan

Junji Kawanaka