Tsinghua University

National Sun Yat-Sen University of Kaohsiung

Shou-Tai Lin

Yen-Yin Lin

An-Chung Chiang

Yen-Chieh Huang

Yuan-Yao Lin

Guey-Wu Chang

A vortex laser generation device in a degenerate cavity with a spiral phase element and a vortex laser generation method are provided. The vortex laser generation device has a degenerate cavity, and the degenerate cavity has a resonator mirror, a gain medium, an optical element, and an output coupler. The off-axis beams are formed in multiple pass transverse modes to resonate by disposing an optical element in the degenerate cavity, so that a vortex laser with orbital angular momentum can be generated.

Vortex laser generation device in degenerate cavity with spiral phase element and vortex laser generation method

The configurations of an electro-optic Bragg deflector and the methods of using it as a laser Q-switch in a Q-switched laser and in a Q-switched wavelength-conversion laser are provided. As a first embodiment, the electro-optic Bragg deflector comprises an electrode-coated electro-optic material with one of a 1D and a 2D spatially modulated electro-optic coefficient. When a voltage is supplied to the electrodes, the electro-optic material behaves like a Bragg grating due to the electro-optically induced spatial modulation of the refractive index. The second embodiment relates to an actively Q-switched laser, wherein the electro-optic Bragg deflector functions as a laser Q-switch. The third embodiment of the present invention combines the Q-switched laser and a laser-wavelength converter to form a Q-switched wavelength-conversion laser, wherein the EO Bragg deflector can be monolithically integrated with a quasi-phase-matching wavelength converter in a fabrication process.

Electro-optic Bragg deflector and method of using it as laser Q-switch in an actively Q-switched laser and an actively Q-switched wavelength-conversion laser

Growing community of inventors

Kaohsiung, Taiwan

Shou-Tai Lin