Coherent light generators – Particular resonant cavity – Folded cavity
Reexamination Certificate
1998-06-17
2001-02-20
Lee, John D. (Department: 2874)
Coherent light generators
Particular resonant cavity
Folded cavity
C359S490020, C359S506000, C372S106000
Reexamination Certificate
active
06192063
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to laser optics and technology making use of the isolator, and more particularly to, a polarization-dependent type directional isolator and a ring-type resonator laser making use of it.
2. Description of the Prior Art
Currently, in order to select the travelling direction of polarized light, a method for forcing only a specific polarized light to travel along one direction by use of an optical isolator has been widely used. This method has an advantage that it can prevent influence due to interference caused by a backwardly travelling light because it allows only a straight polarized light to travel along a single direction in a ring-type resonator laser. However, the conventional method has a disadvantage that it cannot obtain light travelling in the opposite direction, since it only allows the light to travel along a single direction.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a polarization-dependent type directional isolator and a ring-type resonator laser making use of it, which allow laser light to oscillate in both directions independently without interfering with each other within a gain medium, by maintaining the lights, whose polarized states are orthogonal to each other, to travel in directions opposite to each other.
In order to accomplish the above object, according to one aspect of the present invention, there is provided a polarization-dependent type directional isolator of a novel structure, which comprises a pair of first optical means positioned at a path along which light travels, for changing the rotating direction of an incident light according to the travelling direction of the incident light; a pair of second optical means for rotating the incident light by a given angle; and a third optical means positioned between the pair of second optical means, for passing through a specific component of the components of the incident light.
According to another aspect of the present invention, there is provided a ring-type resonator laser of a novel structure, which comprises exciting optical source; wavelength split-combining means for splitting or combining wavelengths of light from the exciting optical source; amplifying medium for amplifying light from the wavelength split-combining means; polarization-dependent type directional isolator for forcing the light from the wavelength split-combining means to travel along specific directions, the amplifying medium and the polarization-dependent type directional isolator being connected by an optical fiber so that a loop can be formed; and mixer for outputing only vertically or horizontally polarized light of the lights passing through the amplifying medium and the polarization-dependent type directional isolator, the polarization-dependent type directional isolator comprising a pair of first optical means positioned at a path along which light travels, for changing the rotating direction of an incident light according to the travelling direction of the incident light; a pair of second optical means for rotating the incident light by a given angle; and a third optical means positioned between the pair of second optical means, for passing through only specific components of the components of the incident light.
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Jhon Young Min
Kim Bong Kyu
Kim Myong Wook
Kim Sang Kuk
Korea Institute of Science and Technology
Lee John D.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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