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Patent

Fiber frequency locker

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TLDR
In this paper, a fiber cavity formed of two spaced fiber gratings is used to construct a laser frequency locker, which is then used to store the laser frequency data for the next day.
Abstract
Techniques and devices using a fiber cavity formed of two spaced fiber gratings to construct a laser frequency locker.

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Patent

Radio frequency modulation of variable degree and automatic power control using external photodiode sensor for low-noise lasers of various wavelengths

TL;DR: In this article, a low-noise laser diode module is proposed for producing stable, broadband, and low-coherent laser, with or without nonlinear frequency conversion processes.
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Optical fiber communication equipment and its applied optical systems

TL;DR: In this paper, an etalon is placed in a light path of diode laser light, which is a parallel plane wave changed by a collimator lens, generating a wavelength error signal from a difference between both of divided pieces of light from transmitted light or reflected light.
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Frequency locking of tunable lasers by using a birefringent optical cavity

TL;DR: In this paper, a feedback control loop is used to lock the laser to the resonator, or alternatively to lock a birefringent optical resonator to the laser.
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Laser frequency stabilizing device, method and program

TL;DR: In this paper, a laser frequency stabilizing device comprises a laser light producer, a spectrometer, an actuator, a drive controller, and a switcher to switch the control of the detector between the control between the first drive controller and the control by the second drive controller.
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Seeking and tracking control for locking to transmision peak for a tunable laser

TL;DR: In this paper, the phase shift modulation scheme was used to adjust one or more optical elements (F1, F2) in the laser cavity to lock the lasing frequency toward a desired channel frequency.
References
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Patent

Polarized fiber laser source

TL;DR: In this paper, a pair of Bragg gratings are placed at opposite ends of a fiber laser cavity to couple-out a predetermined amount of light along one polarization at the lasing wavelength μL.
Patent

Linearly polarized fiber-optic laser

TL;DR: In this paper, the two Bragg gratings are photo-recorded in the fiber and are made in such a way that their resonance wavelength is matched for one polarization, and the wave emitted by the fiber is then polarized linearly along P1.
Patent

Frequency separation stabilization method for optical heterodyne or optical homodyne communication

TL;DR: In this article, a system for stabilizing a frequency separation between two coherent light sources includes first and second current sources driving first-and second-semiconductor laser devices, respectively.
Patent

Frequency stabilization of a laser beam by using a birefrigent body

TL;DR: In this article, a frequency stabilizing device comprises a birefringent body for converting the variation to a variation in a polarization state of the laser beam to produce a polarization varied beam.
Patent

System and a method for frequency-stabilizing a diode laser

TL;DR: In this article, a robust method of stabilizing a diode laser frequency to an atomic transition was proposed, which employs Zeeman shift to generate an anti-symmetric signal about a Doppler-broadened atomic resonance, and therefore offers a large recapture range as well as high stability.