Wavelength conversion element
AssigneeRicoh Company, Ltd.
InventorsHiroaki Fukuda, Hiroyoshi Funato, Shigeyoshi Misawa
Life of this patent
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Abstract
A wavelength conversion element includes a substrate made of LiTaO.sub.3 of non-linear medium, a three-dimensional waveguide formed in the substrate and a second harmonic generation portion for defining a change in refractive index in the waveguide with a period .LAMBDA. and generating a second harmonic of a fundamental wave introduced into the wave guide, where .LAMBDA.=2 m.pi./{.beta.(2.omega.)-2.beta.(.omega.)}, m is a natural number, .omega. is a frequency of fundamental harmonic, .beta.(.omega.) is a propagation constant of the fundamental wave, and .beta.(2.omega.) is a propagation constant of second harmonic.
Claims14
A wavelength conversion element comprising:
- a substrate of non-linear optical medium;
- a three-dimensional waveguide formed in the substrate and having a y-shape divided into two branches at an output side thereof;
- a potential difference application means formed in a branch portion of the waveguide on the substrate for selecting a branch of the waveguide by changing a phase of a fundamental wave guided through the waveguide before a branch point;
- and
- a shorter wavelength harmonic generation means formed in the waveguide for generating a shorter wavelength harmonic from the fundamental wave introduced into the waveguide.
A wavelength conversion element comprising:
- a substrate of non-linear optical medium;
- a plurality of three-dimensional waveguides formed in the substrate and having an optical coupling portion adapted to cause an optical coupling between the plurality of waveguides;
- a potential difference application means formed in the optical coupling portion on the substrate to apply a potential difference for causing the optical coupling between the plurality of waveguides;
- and
- a shorter wavelength harmonic generation means formed in one of the plurality of waveguides for generating a shorter wavelength harmonic from a fundamental wave guided through said one of the plurality of waveguides.
Dependencies are inferred from the claim text.