Coherent light generators – Particular beam control device – Mode locking
Patent
1984-08-28
1991-05-21
Ullah, Akm
Coherent light generators
Particular beam control device
Mode locking
H01S 3098
Patent
active
050181513
ABSTRACT:
An active laser is slaved in an offset frequency relationship to an ultrastable reference laser, by a comparator with a substantially infinite capture range in order to preclude phase-locking on a harmonic or mirror image of the desired offset frequency. The frequency of such a slaved laser is then virtually immune to retro-reflection of its own light back into its resonant cavity, and gains a frequency stability equal to that of the reference. Further, the reference laser is preferably stabilized against retro-reflection of its own light by a method involving selective displacement of objects in the path of the reference laser beam, detection of a Doppler-shifted retro-reflected radiation, and insertion of appropriate optical controls in the beam path to eliminate such retro-reflected radiation from impinging on the reference laser cavity. Multiple laser systems are disclosed in which the active lasers are both series referenced and parallel referenced to a reference laser.
REFERENCES:
patent: 3437955 (1969-04-01), Enloe et al.
patent: 4272734 (1981-06-01), Jarrett et al.
patent: 4405230 (1983-09-01), Tew et al.
patent: 4434490 (1984-02-01), Kevaya et al.
Grunewald Glen R.
Ullah Akm
Wise Robert E.
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