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Proceedings Paper

Second-order nonlinearity and phase matching in thermally poled twin-hole fiber
Author(s): Toru Mizunami; Takahiro Tsukada; Yasuhiro Noi; Keiichi Horimoto
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Paper Abstract

The second-order nonlinearity in poled optical fiber is promising for application to electro-optic switching and modulation, second-harmonic generation (SHG), and frequency conversion. In this paper, we poled a twin-hole fiber, which is similar to PANDA fiber but the strain applying part is vacant. Electrode wires were inserted into the side holes, and the fiber was poled with a voltage of 2.5 kV at 300°C for 40 min. We measured the SHG using a linearly polarized Q-switched Nd3+:YAG laser. The SH power was highest for polarization parallel with the direction of two holes. The SH power had a maximum for the fiber length of 5 cm and decreased for longer fiber lengths. We analyzed this phase matching considering cladding modes. We calculated numerically the propagation constants of the cladding modes. We showed that the ~40th-order cladding mode of the SH wave and the fundamental core mode of the fundamental wave are in phase matching. We also performed an SHG of poled twin-hole fiber using a 260-fs passively mode-locked Er3+-doped fiber laser as a fundamental-wave source. The SH signal from the poled fiber was proportional to the 1.82-th power of the fundamental power, and the polarization dependence agreed with that measured with an Nd3+:YAG laser. We discussed an application of the poled twin-hole fiber.

Paper Details

Date Published: 14 June 2004
PDF: 8 pages
Proc. SPIE 5350, Optical Components and Materials, (14 June 2004); doi: 10.1117/12.528490
Show Author Affiliations
Toru Mizunami, Kyushu Institute of Technology (Japan)
Takahiro Tsukada, Kyushu Institute of Technology (Japan)
Yasuhiro Noi, Kyushu Institute of Technology (Japan)
Keiichi Horimoto, Kyushu Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 5350:
Optical Components and Materials
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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