Beam diameter control for p laser having improved coherence
Abstract
Abstract A pulsed laser and preferably one with a solid laserable material is caused to oscillate substantially in a single mode to increase its coherence length. This is accomplished by the provision of one or more dye cells containing a saturable absorber for the optical radiation of the laser. This combined dye cell has a length of no less than 1/4 and no more than 2/3 that of the optical cavity and preferably a length of approximately 1/2 that of the cavity. Due to the provision of such a long dye cell the initial mode of oscillation of the laser is favored and the dye cell discriminates to a substantial extent against all other oscillating modes. Discrimination against unwanted modes is improved by controlling the size of the beam diameter passing through the dye cell. This permits independent control of the initial transmission of the dye cell by controlling the concentration of the dye, and the extent of bleaching during the pulse by controlling the beam diameter and hence light intensity within the cell.
Inventors
- 👤 R Wuerker
- 👤 L Heflinger
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |