Laser control apparatus and method for frequency offset...

Details Laser control apparatus and method for frequency offset... Laser control apparatus and method for frequency offset...

H - Electricity

01

S

325/1, 315/24

H01S 3/13 (2006.01) H01S 3/139 (2006.01)

Patent

CA 1255743

ABSTRACT OF THE DISCLOSURE 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 stabilizer 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.

489083

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