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Laser wavelength stabilizing device

一种波长、激光束的技术，应用在激光器、测量装置、半导体激光器等方向

Pending Publication Date: 2022-04-29
COHERENT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of Shaddock et al. does not require a birefringent element, but requires at least three coated mirrors, with corresponding assembly and alignment costs for the ring cavity

Method used

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  • Laser wavelength stabilizing device
  • Laser wavelength stabilizing device
  • Laser wavelength stabilizing device

Examples

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Embodiment Construction

[0024] Turning now to the drawings, wherein like features are represented by like reference numerals. Figure 1AA preferred embodiment 10 of a wavelength sensing (frequency sensing) device according to the invention for tracking wavelength shifts (frequency shifts) in a laser radiation beam 12 is schematically shown. Cartesian axes are described for reference, where the x-axis and y-axis are arbitrarily assigned. The z-axis is the propagation axis of the laser beam 12 . Apparatus 10 includes a non-birefringent etalon 14 positioned within and tilted relative to laser beam 12 . The normal 16 of the etalon 14 is inclined at an angle θ with respect to the axis of propagation of the laser beam 12 . The etalon 14 has a parallel planar first surface 18 and a planar second surface 20 . The etalon can be made of any glass or crystal that is transparent to laser radiation, provided the etalon does not exhibit birefringence. For example, etalon 14 has a thickness T in the range betwee...

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Abstract

A wavelength sensor for laser beam wavelength stabilization includes an etalon placed in and tilted relative to a laser beam. The reflected light beam from the etalon forms an interference pattern on a segmented photodetector having two detector segments. The output signals from the two detector segments are used to derive an error signal for the closed control loop to achieve wavelength stabilization.

Description

[0001] priority [0002] This application claims priority to U.S. Patent Application Serial No. 16 / 518,689, filed July 22, 2019, the disclosure of which is incorporated herein in its entirety. technical field [0003] The present invention generally relates to stabilizing the output wavelength of a laser. In particular, the invention relates to stabilizing the output wavelength of lasers operating in a single longitudinal mode. Background technique [0004] In certain laser applications, it is desirable to select a single longitudinal mode to operate the laser and maintain undisturbed operation of the selected mode for a relatively long period of time. For example, laser spectroscopy or trace gas detection. A single longitudinal mode has a corresponding wavelength within the gain bandwidth of the laser. Typically, laser resonators operate in the longitudinal mode near the peak in the gain spectrum. In a laser with a resonator length of approximately 130 millimeters (mm),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/0683G01J9/02
CPCH01S5/0683G01J9/02H01S5/0014H01S3/1305H01S5/0654H01S5/0687H01S3/137H01S3/139H01S3/08036
Inventor 舒其泽
Owner COHERENT INC
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