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Infrared broadband tunable Twyman-Green interferometer and method

An interferometer and broadband technology, applied in the field of interferometers, can solve the problems of insufficient coherence length and wide laser bandwidth, and achieve the effect of expanding the band range and making up for the lack of coherence.

Pending Publication Date: 2022-05-31
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI +1
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  • Application Information

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Problems solved by technology

However, the laser bandwidth output by the tunable laser is wide, and the insufficient coherence length is its biggest weakness

Method used

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  • Infrared broadband tunable Twyman-Green interferometer and method
  • Infrared broadband tunable Twyman-Green interferometer and method
  • Infrared broadband tunable Twyman-Green interferometer and method

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Embodiment Construction

[0036] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0038] Aiming at the deficiencies of the prior art, the present invention provides an infrared wide-band tunable Tyman-Green interferometer, which uses an infrared tunable laser as a light source. Within the tunable wavelength band, it is possible to arbitrarily select a specific wavelength for interferometry. It has important application value for the measurement of wavelength-related components or systems, such as the measureme...

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Abstract

The invention provides an infrared broadband tunable Twyman-Green interferometer and a method, relates to the technical field of interferometers, and can make up for the defect of insufficient coherence of a tunable laser light source by utilizing the advantage that the length of a reference arm is adjustable so as to realize broadband interference measurement from near-infrared to 12 [mu] m. An infrared tunable laser light source, a beam combiner, a focus lens group, a pinhole diaphragm, a collimating lens group, a test adaptive lens group and a standard plane mirror of the interferometer are sequentially connected through a light path; an optical device to be tested is arranged on a light path between the test adaptive lens group and the standard plane mirror; a beam splitter is arranged on a light path between the collimating lens group and the test adaptive lens group; the reference standard plane mirror is arranged on the precise translation table, the reference standard plane mirror and the convergent mirror group are arranged above and below the beam splitter, and the beam splitter is arranged on a light path between the reference standard plane mirror and the convergent mirror group; during testing, the infrared detector is in light path connection with the convergent mirror group; and the infrared detector is electrically connected with the upper computer.

Description

technical field [0001] The invention relates to the technical field of interferometers, in particular to an infrared broadband tunable Tyman-Green interferometer and a method. Background technique [0002] At present, mainstream interferometer products on the market use narrow linewidth lasers with good coherence as light sources. For example, 0.633 μm He-Ne lasers are usually used in the visible light band, and 3.39 μm and 10.6 μm lasers are usually used in the infrared band. The characteristic of these interferometers is that the wavelength cannot be changed or can only be adjusted to a limited range, so it can only be limited to a limited number of laser wavelengths for measurement. [0003] However, some measurements are closely related to wavelength. For example, the refractive index of a medium is a function of wavelength. Obviously, the measurement results of a single wavelength cannot represent the refractive index values ​​of other wavelengths. Another example is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/02015
CPCG01B9/02015
Inventor 张志勇冯志伟白先勇邓元勇王雅琦徐刚朱晓明郭思璠
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI