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Optical wavelength converter device
| Details |
Inventors: Okazaki, Yoji; Kamiyama, Koji; Okazaki, Masaki;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Epps; Georgia Y.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
An optical wavelength converter device has a waveguide of a nonlinear optical material disposed in cladding and having a refractive index lower than the refractive index of the cladding for converting a fundamental guided through the waveguide into a second or third harmonic and radiating the second or third harmonic into the cladding. The nonlinear optical material comprises an organic nonlinear optical material having a maximum light absorption coefficient at a wavelength close to the wavelength of at least one of the fundamental and the second harmonic. |
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DETAILED DESCRIPTION In view of the aforesaid drawbacks of the conventional optical wavelength converter devices, it is an object of the present invention an optical wavelength converter device capable of actually extracting a large amount of light of a wavelength converted wave such as a second harmonic, sum- or difference-frequency wave and a third harmonic through a resonant effect.
According to the present invention, an optical wavelength converter device of the optical fiber type or the optical waveguide type is constructed as a Cherenkov radiation device in which phase matching is gained between a guided mode in which a fundamental is guided through a core (or an optical waveguide in the optical waveguide type device) and a radiation mode in which a harmonic such as a second harmonic and a third harmonic is radiated into cladding or between a nonlinear polarized wave made by a guided mode of two fundamentals having different wavelengths and a radiation mode in which a sum- or difference-frequency wave is radiated into cladding.
The core is made of an organic nonlinear optical material which produces the resonant effect, referred to above, and has a maximum light absorption coefficient at a wavelength close to the wavelength of at least one of the fundamental and the wavelength converted wave.
In another optical wavelength converter device according to the present invention, the core is made of the above organic nonlinear optical material, and the cladding has a thickness of at least 250 .
mu.
m from an outer surface thereof to the waveguide.
In still another optical wavelength converter device according to the present invention, the core is made of the above organic nonlinear optical material, and the cladding has a thickness which is greater than (L.
multidot.
tan.
theta.
)/2 where .
theta.
is the phase matching angle of the wavelength converted wave, and L is the length of the optical wavelength converter device.
In yet another optical wavelength converter device according to the present invention, the core is made of the above organic nonlinear optical material, and the cladding has a thickness which is greater than L
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Optical Systems 
