Patent US3668547A successfully refreshed from Google Patents.
US3668547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-stabilized laser arrangement
Assignee: Siemens AG
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Filing: 1971-03-10
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Granted: 1972-06-06
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Expires: 1991-03-10
Abstract
Abstract A laser arrangement for the stabilization of the frequency of a one or two mode gas laser, particularly a short He-Ne laser, where the stimulated medium is arranged between a fixed mirror and a mirror which is displaceable by means of a piezo-ceramic in the axial direction of the laser, the laser beams discharging from the partially transparent fixed mirror being used to generate a DC voltage control signal which is proportional to the frequency deviation of the laser beams with respect to the central frequency of the amplifying transfer, returning the resonator to the central frequency by way of the piezo-ceramic, in the control circuit which contains a photosensitive element and subsequent amplifiers and phase sensitive demodulators. The stimulated medium is arranged, at least partially, in a magnetic coil which is excited to generate an axis-parallel alternating magnetic field. A lambda 4 plate and a polarization device are arranged between the fixed partially transparent mirror and the photo-sensitive element.
Inventors
- 👤 Viktor Bodlaj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:38
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/139; H01S3/1398
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
In a laser arrangement for stabilizing the frequency of a gas laser, particularly a short He-Ne laser, wherein the stimulated medium is positioned between a partially transparent fixed mirror and a displaceable mirror mounted on a piezo-ceramic and displaceable in the axial direction of the laser, wherein the laser beams discharging from the partially transparent fixed mirror are utilized to generate a DC control signal proportional to the frequency deviation of the laser beams with respect to the central frequency vo of the amplifying transfer, the control signal being utilized to return the resonator to the central frequency vo via the piezo-ceramic, the improvement therein comprising a coil disposed about the laser and energizable to generate an axis-parallel alternating magnetic field, a lambda /4 plate and a polarization device disposed to receive laser beams from the partially transparent fixed mirror, a photosensitive element for receiving polarized laser beams from said polarization device and responsive thereto to produce an output signal for controlling the energization of said coil.
Claim 2
Dependent Claim
167 words
In a laser arrangement for stabilizing the frequency of a gas laser, particularly a short He-Ne laser, wherein the stimulated medium is positioned between a partially transparent fixed mirror and a displaceable mirror mounted on a piezo-ceramic and displaceable in the axial direction of the laser, wherein the laser beams discharging from the partially transparent fixed mirror are utilized to generate a DC control signal proportional to the frequency deviation of the laser beams with respect to the central frequency vo of the amplifying transfer, the control signal being utilized to return the resonator to the central frequency vo via the piezo-ceramic, the improvement therein comprising a coil disposed about the laser and energizable to generate an axis-parallel alternating magnetic field, a lambda /4 plate and a polarization device disposed to receive laser beams from the partially transparent fixed mirror, a photosensitive element for receiving polarized laser beams from said polarization device and responsive thereto to produce an output signal for controlling the energization of said coil.
Claim 3
Dependent Claim
20 words
In a laser arrangement according to claim 1, comprising a resonance amplifier which includes said coil as the inductance thereof.
Claim 4
Dependent Claim
68 words
In a laser arrangement according to claim 1, further comprising a potentiometer, an electric motor for operating said potentiometer, a logic circuit for operating said motor in accordance with the signal produced by said photo-sensitive element, said potentiometer being connected in circuit with said piezo-ceramic to provide an additional DC voltage thereto when the laser frequency is outside of the control range of the photo-sensitive element control circuit.
Claim 5
Dependent Claim
37 words
In a laser arrangement according to claim 3, comprising demodulation means connected between said photo-sensitive element and said logic circuit, said logic circuit being operable to insure that the photo-element voltage has been demodulated correctly at phase.
Claim 6
Dependent Claim
22 words
In a laser arrangement according to claim 3, comprising means for disconnecting the circuit of said photo-sensitive element during a search operation.
Claim 7
Dependent Claim
45 words
In a laser arrangement according to claim 3, comprising a second logic circuit connected between said potentiometer and said first logic circuit and operable to effect a return of the potentiometer toward a central position prior to adjustment of the potentiometer to a predetermined limit.
Claim 8
Dependent Claim
47 words
In a laser arrangement according to claim 6, wherein said second logic circuit includes means for inhibiting said first logic circuit during the return movement of said potentiometer, and comprising means for rendering the output of said photo-sensitive means ineffective during the return movement of said potentiometer.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |