Dispersion compensator and dispersion compensating systsem
First Claim
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1. A dispersion compensator comprising:
- an angular dispersion element for changing an angle of a light which is ejected from an optical transfer element according to a wavelength in the ejected light;
a diffracting optical element having at least a concave reflecting surface so as to diffract the ejected light; and
a reflecting mirror having a reflecting surface which is disposed near a focal point in an entire optical system of which surface shape of the reflecting mirror changes in a dispersing direction of the ejected light according the wavelength in the ejected light.
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Abstract
A dispersion compensator is formed by an angular dispersion element, a diffracting optical element, and a reflecting mirror. By forming a reflecting surface in free-formed surfaces which are different between Y-Z plane and X-Z plane and shifting a reflecting position on a reflecting surface per wavelengths, dispersion and dispersion slope are compensated by having an optical path length difference per wavelengths.
By doing this, it is possible to realize a dispersion compensator which can compensate dispersion and dispersion slope simultaneously with low loss.
19 Citations
39 Claims
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1. A dispersion compensator comprising:
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an angular dispersion element for changing an angle of a light which is ejected from an optical transfer element according to a wavelength in the ejected light;
a diffracting optical element having at least a concave reflecting surface so as to diffract the ejected light; and
a reflecting mirror having a reflecting surface which is disposed near a focal point in an entire optical system of which surface shape of the reflecting mirror changes in a dispersing direction of the ejected light according the wavelength in the ejected light. - View Dependent Claims (6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 30, 31, 33, 34, 35, 36, 37, 38)
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2. A dispersion compensator comprising:
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an angular dispersion element for changing an angle of a light which is ejected from an optical transfer element according to a wavelength in the ejected light;
an optical element having a light-condensing function;
a diffracting optical element having at least a concave reflecting surface so as to diffract the ejected light; and
a reflecting mirror having a reflecting surface which is disposed near a focal point in an entire optical system of which surface shape of the reflecting mirror changes in a dispersing direction of the ejected light according the wavelength in the ejected light. - View Dependent Claims (3, 9, 10, 25, 26, 27, 28, 29, 39)
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4. A dispersion compensator comprising:
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an angular dispersion element for changing an angle of a light which is ejected from an optical transfer element according to a wavelength in the ejected light;
an optical element having a light-condensing function;
an optical deflecting device for deflecting a light which is ejected from the optical element near a focal point in which the light which is ejected from the optical element is focused;
a diffracting optical element having at least a concave reflecting surface so as to diffract the ejected light; and
a reflecting mirror having a reflecting surface which is disposed near a focal point in an entire optical system of which surface shape of the reflecting mirror changes in a dispersing direction of the ejected light according the wavelength in the ejected light. - View Dependent Claims (5)
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32. A dispersion compensator according to claim wherein the angular dispersion element is an etalon.
Specification