Unidirectional Single-Mode 532-nm Nd:YAG Laser Using Intracavity Frequency Doubling in Nonplanar Ring Geometry |
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Authors: | Email author" target="_blank">Jong?Rak?ParkEmail author Hyun?Su?Kim Jin-Tae?Kim |
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Institution: | (1) Department of Photonic Engineering, Chosun University 375 Seosuk-dong, Dong-gu, Gwangju, 501-759, South Korea |
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Abstract: | Intracavity frequency doubling of a single-mode Nd:YAG laser using a nonplanar ring cavity is demonstrated. The nonplanar ring cavity consists of a Brewster-angled Nd: YAG crystal placed in a magnetic field, a KTP crystal, and two spherical mirrors. In this design the Nd:YAG crystal acts as both a nonreciprocal polarization rotator and a partial polarizer, and the nonplanar portion of the ring cavity, which is formed by a relative twist angle between the Brewster-angled end surfaces of the crystal, serves as a reciprocal polarization rotator. Eigenpolarization theory for the cavity configuration is presented and a suitable value of the relative twist angle for unidirectional operation is estimated. A single-mode output power of 22 mW at 532 nm is obtained with a 1.2-W diode laser at 809 nm and a laser linewidth of less than 100 kHz is inferred from a beat note frequency spectrum between two identical laser systems. |
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Keywords: | Nd:YAG laser single-mode laser intracavity frequency doubling nonplanar ring cavity |
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