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Optical isolator for transmitting light propagating forward and not transmitting light propagating backward, laser module using the optical isolator, optical amplifier using the optical isolator and polarizing filter used for a polarizer and an analyzer of the optical isolator
Optical isolator for transmitting light propagating forward and not transmitting light propagating backward, laser module using the optical isolator, optical amplifier using the optical isolator and polarizing filter used for a polarizer and an analyzer of the optical isolator
A laser beam is incident on a polarizer inclined by an inclined angle ranging from 50 to 60 degrees with respect to an optical axis, a polarized component of the laser beam polarized in a first polarization direction passes through the polarizer. The polarized component is rotated on the optical axis in a second polarization direction by 45 degrees in a Faraday rotator and is incident on an analyzer which is inclined by the inclined angle in a direction opposite to that of the inclination of the polarizer with respect to the optical axis to transmit only a laser beam polarized in the second polarization direction. Therefore, the polarized component passes through the analyzer almost without attenuation, and a wave front aberration of the laser beam caused by the polarizer is cancelled out in the analyzer.
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