Unstable ring resonator with cylindrical mirrors

Details Unstable ring resonator with cylindrical mirrors Unstable ring resonator with cylindrical mirrors

1977-07-27

1979-01-23

Sikes, William L.

Oscillators

Relaxation oscillators

331 945C, H01S 3083

Patent

active

041357876

ABSTRACT:
An unstable ring resonator capable of providing an output beam having high power and high optical quality is disclosed. The unstable ring resonator is formed with a first region capable of providing transverse mode discrimination, beam magnification and improved beam quality, a second region capable of accommodating a gain medium and means for out coupling a beam of electromagnetic radiation to provide an output beam. Transverse mode discrimination is provided by the lowest loss mode characteristic of unstable resonators, improved mode discrimination and optical quality is obtained by utilizing mirrors having curved surfaces to focus the circulating electromagnetic radiation through spatial filters having line apertures and beam magnification is provided by the relative spacing of the curved surfaces. The unstable ring resonator is capable of providing a laser beam having a central portion with low beam intensity in the near field and having far field characteristics of high optical quality and high beam power.

REFERENCES:
patent: 3824487 (1974-07-01), Buczek

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