WAVELENGTH CONVERSION OPTICAL ELEMENT

WIPO Patent Application WO/2020/240676

A1

Provided is a wavelength conversion optical element (10A) using nonlinear optical effects and having a device structure in which the wavelength conversion efficiency increases as intended when increasing a waveguide length. The element (10A) adopts a waveguide structure employing lithium niobate that is a secondary nonlinear optical material. Wavelength conversion regions (E1), (E2) correspond to two linear waveguides (L1), (L2) that extend parallel to each other on the flat surface of a flat structure so that the length of the wavelength conversion regions matches the length of the two linear waveguides. One end of the linear waveguide (L1) is on the incident side of excitation light and one end of the linear waveguide (L2) is on the emission side of wavelength converted light, and a portion between the linear waveguides (L1), (L2) excluding the incident side and the emission side is bridged by a curved waveguide (LC). The secondary nonlinear optical medium that forms the linear waveguides (L1), (L2) has a polarization inverted structure in which the direction of spontaneous polarization is periodically inverted relative to the light propagation direction. The polarization inversion periods of the polarization inverted structure are equal to each other.

KASHIWAZAKI TAKAHIRO (JP)
UMEKI TAKESHI (JP)
KASAHARA RYOICHI (JP)
TADANAGA OSAMU (JP)
EMBUTSU KOJI (JP)
KAZAMA TAKUSHI (JP)
KOSHOBU NOBUTATSU (JP)

PCT/JP2019/020966

December 03, 2020

May 27, 2019

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NIPPON TELEGRAPH & TELEPHONE (JP)

G02F1/377

JP2014222331A	2014-11-27
US20050134958A1	2005-06-23
JPH0534748A	1993-02-12
JP2004021011A	2004-01-22
US20030112492A1	2003-06-19
JP2018194710A	2018-12-06

TANI & ABE, P.C. (JP)

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