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US3594659A Expired / Lapsed US ⏱️ 0.0 years remaining

Device for the frequency stabilization of a gas laser oscillator

Assignee: University of Bern
•
Filing: 1968-01-12
•
Granted: 1971-07-20
•
Expires: 1988-01-12
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Abstract

Abstract A device for the frequency stabilization of a gas laser oscillator, wherein the oscillator is formed by a laser between two reflectors, the laser consisting of a tube filled with helium and neon, the latter free of isotopes. An error signal is obtained corresponding to the deviation of a resonant frequency from its standard value in that a right and a left circularly polarized component of the laser beam are absorbed when passing the tube wherein a magnetic field and a gas discharge are maintained. Absorption of the two components occurs to different degree due to the Zeeman effect, and a magnitude corresponding to this difference is established as a function of the frequency. The error signal controls the distance of the two reflectors from each other.

Inventors

  • 👤 Hanspeter Brandli
  • 👤 Rene Dandliker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 01:03
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/139; H01S3/1398; H01S3/131; H01S3/134; H01S3/14; H01S3/22

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 39 words
The device as defined in claim 1, wherein a linear polarizer is interposed between said multiplier and said second piezoelectric element, the plane of polarization of said polarizer being vertical relative to that of the linearly polarized laser beam.
Claim 2
Dependent Claim 72 words
The device as defined in claim 1, a magnifying amplifier, a phase-sensitive third demodulator, and a third amplifier, the output of said multiplier being connected to said magnifying amplifier which feeds said third amplifier synchronized to said given modulation frequency; the output signal of said third amplifier being demodulated in said phase-sensitive third demodulator; the demodulated output being carried to said first piezoelectric element to control the mutual distance of said reflectors.

References Cited (Backward Citations)

FR1350398A Cited
US3361990A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-07-19 1975-01-18 1975-07-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-07-19 1979-01-18 1979-07-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-07-19 1983-01-18 1983-07-20 $7700.00 Window Closed / Lapsed

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