CW Laser wavemeter/frequency locking technique
Abstract
Abstract A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f 0 to a radio frequency f 1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f 0 is phase modulated by a signal of average frequency f 1 that is itself modulated at frequency f 2 . The modulated beam is passed through a filter to a detector to produce a detector output signal that has components at linear integral sums of f 1 and f 2 . A pair of control signals are generated that are proportional to the amplitude of two of the components of the detector output signal. These control signals are separately used in a pair of servo loops to separately establish fixed values of f 0 /f f and f 1 /f f , where f f is a characteristic frequency of the filter. A method is presented for stepping the value of f 0 /f f to another value and measuring f 1 /f 2 at each of these values, thereby enabling the value of f 0 to be determined.
Inventors
- 👤 Gregory M. Cutler
Bibliographic Details
Claims Analysis
Total Claims: 9References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |