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Gas laser and optical system

A technology of lasers and optical devices, applied in the field of optical systems

Inactive Publication Date: 2002-12-04
RENISHAW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various He-Ne lasers have back reflection sensitivity issues

Method used

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  • Gas laser and optical system
  • Gas laser and optical system

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Embodiment Construction

[0011] Shown is a He-Ne laser 1 for supplying constant frequency coherent light to an interferometer 2 via an optical fiber 3 . The working principle of this type of interferometer is well known, but it is briefly described here as follows:

[0012] The beam splitter 5 splits the output beam 4 of the optical fiber into two, the reference beam 6 transmits to the fixed mirror 7 and returns to the optical fiber; the measuring beam 8 transmits to the movable mirror 9 and returns to the optical fiber. The beams 6 and 8 combine to form interference fringes. These fringes are detected by detector 10 and give the distance moved by mirror 9 in the direction of arrow A.

[0013] In order to determine the displacement of the mirror 9, the wavelength of the light used must be known. The more stable the frequency of the light, the more precise the measured displacement.

[0014] In such systems, since the laser is connected to an optical fiber, back reflection is a particularly difficul...

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Abstract

An optical device, such as an interferometric displacement meter; a spectrometer; a polarization meter; or a heterodyne frequency meter, having a linear helium-neon gas laser having substantially equal proportions of Ne20 and Ne22 isotopes, the device being used in There is optical feedback towards the laser so that 0.1% or more of the laser's optical output is returned to the laser (1). Good polarization stability can be achieved with this type of laser, even though excessive back reflections may occur, allowing the frequency of the laser to be easily controlled.

Description

technical field [0001] The invention relates to a helium-neon gas laser and an optical system used therein. Background technique [0002] Typically, gas lasers are used in those devices that rely on a specific frequency of laser light, for example, known wavelengths of light can be used for interferometry. Laser light of a certain frequency can be used as a reference for measuring the frequency of other light, such as a heterodyne frequency measurement system. Laser spectrometers also require light with a narrowly defined frequency. Laser light of a specific polarization and frequency can be used for polarization measurements. [0003] Helium-neon (HeNe) lasers are well suited for these purposes because they generate suitable frequencies and are easy to control. [0004] Patent WO98 / 05955 and US Patent 4,844,593 both disclose laser interferometers. One of the topics discussed in these two documents is preventing or reducing the reflection of the output light of the laser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B9/02H01S3/034H01S3/104H01S3/22
CPCH01S3/034H01S3/104H01S3/22H01S3/2222G01B9/02003
Inventor 罗兰·亨利·普拉特
Owner RENISHAW PLC
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