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Optical Systems

Fiber-type-wavelength-conversion-element

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Fiber type wavelength conversion element

Details

Inventors: Chikuma, Kiyofumi;
Assignee: Pioneer Electronic Corporation (Tokyo, JP)
Primary Examiner: Ullah; Akm E.
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner

In a fiber type wavelength conversion element, which has a fiber core made of non-linear optical crystal and in which a wavelength of incident ight is converted by non-linear optical effects of the second order on the core, a clad material is used, which has a refractive index to satisfy a condition of: 0.95<n clad.sup.2.omega. /n core.sup..omega. <1.005 where the refractive index of the core to incident light is n.sub.core .omega., and the refractive index of the clad to secondary higher harmonic light as n.sub.clad.sup.2.omega..

DETAILED DESCRIPTION An object of the present invention is to provide a fiber type wavelength conversion element with high efficiency, using Cherenkov radiation type phase matching.
The fiber type wavelength conversion element according to the present invention comprises a core of fiber made of non-linear optical crystal and it is a fiber type wavelength conversion element to convert the wavelength of incident light by the secondary non-linear optical effect in the core.
When it is supposed that the refractive index of the core to incident light is n.
sub.
core.
sup.
2.
omega.
and the refractive index of the clad to the secondary higher harmonic light is n.
sub.
clad.
sup.
2.
omega.
.
The invention is made of the clad material having the refractive index to satisfy the following condition: 0.
95<N.
sub.
clad.
sup.
2.
omega.
/N.
sub.
core.
sup.
.
omega.
<1.
005

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