Temperature-compensated optical isolator

An optical isolator comprising:

• a polarizer adapted to polarize a beam of incident light to form a beam of polarized light;
• an analyzer adapted to transmit said beam of polarized light and to polarize back-reflected light;
• a magneto-optical element disposed between the polarizer and the analyzer, which magneto-optical element rotates the polarization direction of said beam of polarized light;
• a magnet generating a magnetic field penetrating said magneto-optical element;
• and
• an automatic actuator mechanically connected to said magneto-optical element to move said magneto-optical element relative to said magnet in response to one or more of a temperature variation and a variation of the wavelength of said incident light, wherein said automatic actuator further comprises a thermal expansion element comprising
• an elastically deformable closed body filled with a fluid having a non-zero thermal expansion coefficient.

An optical isolator comprising:

• a polarizer adapted to polarize a beam of incident light to form a beam of polarized light;
• an analyzer adapted to transmit said beam of polarized light and to polarize back-reflected light;
• a magneto-optical element disposed between the polarizer and the analyzer, which magneto-optical element rotates the polarization direction of said beam of polarized light;
• a magnet generating a magnetic field penetrating said magneto-optical element;
• and
• an automatic actuator mechanically connected to said magnet to move said magnet relative to said magneto-optical element in response to one or more of a temperature variation and a variation of the wavelength of said incident light wherein said automatic actuator further comprises a thermal expansion element comprising
• a piston that is axially movable in a cylinder filled with a fluid having a non-zero thermal expansion coefficient.

An optical isolator comprising:

• a polarizer adapted to polarize a beam of incident light to faun a beam of polarized light;
• an analyzer adapted to transmit said beam of polarized light and to polarize back-reflected light;
• a magneto-optical element disposed between the polarizer and the analyzer, which magneto-optical element rotates the polarization direction of said beam of polarized light;
• a magnet generating a magnetic field penetrating said magneto-optical element;
• and
• an automatic actuator mechanically connected to said magnet to move said magnet relative to said magneto-optical element in response to one or more of a temperature variation and a variation of the wavelength of said incident light wherein said automatic actuator further comprises a thermal expansion element comprising
• an elastically deformable closed body filled with a fluid having a non-zero thermal expansion coefficient.