US3584312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spikeless single-mode laser
Assignee: Raytheon Co
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Filing: 1969-10-20
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Granted: 1971-06-08
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Expires: 1989-10-20
Abstract
Abstract A laser structure comprising a rod-type lasing element and including means for pumping the element to produce light emission from the ends thereof. Optical means responsive to the light emission create a traveling wave of the light which passes through the rod-type lasing element numerous times to produce a single mode output beam of coherent radiation. A nonlinear light absorber interposed in the single-mode output beam path absorbs large portions of light energy in the traveling wave as the intensity thereof increases. Such arrangement is operative so as to reduce the inherent spiking of the output light beam characteristic.
Inventors
- 👤 Hermann Statz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:16
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08018; H01S3/08022; H01S3/08031; H01S3/081; H01S3/083; H01S3/10; H01S3/13; H01S3/136; H01S3/106; H01S3/107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A laser structure for eliminating spiking comprising: a rod-type element; means for pumping said element to produce light emission from the ends thereof which may include spikes; optical means including an optical isolator for creating a travelling wave of said light which passes through said lasing element a number of times to produce a single-mode output beam of coherent electromagnetic radiation; and a passive light absorber having a nonlinear input-output characteristic interposed in the single-mode output beam path for passively absorbing larger fractions of light energy in said travelling wave and for suppressing the oscillation level of substantially all frequencies in said spikes as the intensity of said beam increases.
Claim 2
Dependent Claim
110 words
A laser structure for eliminating spiking comprising: a rod-type element; means for pumping said element to produce light emission from the ends thereof which may include spikes; optical means including an optical isolator for creating a travelling wave of said light which passes through said lasing element a number of times to produce a single-mode output beam of coherent electromagnetic radiation; and a passive light absorber having a nonlinear input-output characteristic interposed in the single-mode output beam path for passively absorbing larger fractions of light energy in said travelling wave and for suppressing the oscillation level of substantially all frequencies in said spikes as the intensity of said beam increases.
Claim 3
Dependent Claim
35 words
A laser structure in accordance with claim 1, wherein said passive light absorber is a nonlinear lossy material, the power absorption of which is proportional to at least the square of the electromagnetic energy density.
Claim 4
Dependent Claim
28 words
A laser structure in accordance with claim 2, wherein said passive light absorber comprises one of the materials selected from the group consisting of nitrobenzene and carbon disulfide.
Claim 5
Dependent Claim
95 words
In combination: an element for generating radiation by stimulated emission; means for pumping said element to produce stimulated electromagnetic radiation emission from said element; means for causing said radiation to pass through said element a number of times and for producing an output beam of coherent electromagnetic radiation; and a passive absorber having a nonlinear broadband absorption input-output characteristic interposed in the output beam path for passively absorbing larger fractions of energy in said beam and for suppressing the oscillation level of substantially all frequencies in said spikes as the intensity of said beam increases.
Claim 6
Dependent Claim
95 words
In combination: an element for generating radiation by stimulated emission; means for pumping said element to produce stimulated electromagnetic radiation emission from said element; means for causing said radiation to pass through said element a number of times and for producing an output beam of coherent electromagnetic radiation; and a passive absorber having a nonlinear broadband absorption input-output characteristic interposed in the output beam path for passively absorbing larger fractions of energy in said beam and for suppressing the oscillation level of substantially all frequencies in said spikes as the intensity of said beam increases.
Claim 7
Dependent Claim
30 words
A combination in accordance with claim 4, further including an isolator interposed in the path of said electromagnetic radiation for the elimination of standing waves with resultant single-mode propagation characteristics.
Claim 8
Dependent Claim
14 words
A combination in accordance with claim 5, wherein said radiation is travelling wave radiation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |