摘要:
An improved unstable optical cavity for optical amplifiers or laser oscillators is made effectively single mode by altering the central Fresnel zone of the back mirror in order to provide constructive interference at the plane of the output aperture.
摘要:
An unstable optical resonator having a gain region that has an elliptic or other non-circular cross section still has the benefits of a total collimated cavity Fresnel number that is azimuthally symmetric by the combination of several cavity regions of azimuthally non-uniform Fresnel number of appropriate size.
摘要:
An output coupler for a high power ring laser employs a wedge mirror and a corresponding inverted wedge mirror to deflect a portion of both forward and reverse traveling waves and to combine the out-coupled radiation into a single output beam.