Optical device including faraday rotator

A display device, comprising:

• one or more image sources configured to provide first image light;
• and
• a first optical assembly including a first polarization-sensitive reflector, a second polarization-sensitive reflector, and a first Faraday rotator disposed between the first polarization-sensitive reflector and the second polarization-sensitive reflector such that:
• at least a portion of the first image light having a first polarization is transmitted through the first polarization-sensitive reflector as first light, and the first light is transmitted through the first Faraday rotator toward the second polarization-sensitive reflector as second light having a second polarization different from the first polarization;
• the second light is reflected by the second polarization-sensitive reflector toward the first Faraday rotator and transmitted through the first Faraday rotator toward the first polarization-sensitive reflector as third light having a third polarization orthogonal to the first polarization;
• the third light is reflected by the first polarization-sensitive reflector toward the first Faraday rotator and transmitted through the first Faraday rotator toward the second polarization-sensitive reflector as fourth light having a fourth polarization orthogonal to the second polarization;
• and
• the fourth light is transmitted through the second polarization-sensitive reflector.

A method, comprising:

• receiving first image light at a first polarization-sensitive reflector of a first optical assembly, the first optical assembly having a second polarization-sensitive reflector and a first Faraday rotator disposed between the first polarization-sensitive reflector and the second polarization-sensitive reflector;
• transmitting at least a portion of the first image light through the first polarization-sensitive reflector toward the first Faraday rotator as first light having a first polarization;
• transmitting the first light through the first Faraday rotator toward the second polarization-sensitive reflector as second light having a second polarization different from the first polarization;
• reflecting the second light at the second polarization-sensitive reflector toward the first Faraday rotator;
• transmitting the second light through the first Faraday rotator toward the first polarization-sensitive reflector as third light having a third polarization orthogonal to the first polarization;
• reflecting the third light at the first polarization-sensitive reflector toward the first Faraday rotator;
• transmitting the third light through the first Faraday rotator toward the second polarization-sensitive reflector as fourth light having a fourth polarization orthogonal to the second polarization;
• and
• transmitting the fourth light through the second polarization-sensitive reflector.