Spectrum analytical equipment

A technology of spectrum analysis and optics, applied in optics, spectrum investigation, spectrum generation, etc., can solve problems such as difficult to achieve narrowband output, and achieve the effect of no mechanical moving parts, fast stability, and reasonable design

Inactive Publication Date: 2014-07-16
GP PHOTONICS INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to achieve a narrowband output with a tunable laser using only an acousto-optic filter

Method used

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Embodiment Construction

[0037] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] figure 1 A schematic diagram of a common Fabry-Perot optical etalon 100 is given. The material of the Fabry-Perot optical etalon 100 generally adopts optical glass such as fused silica or BK7 in the near-infrared and visible light bands. Assuming that the refractive index of the material is n, the two light-transmitting surfaces 2 and 4 are all coated with high The reflective film, whose reflectivity is R, has a thickness of h, and light is incident at an incident angle close to zero, can only pass through the etalon if it satisfies 2nh=mλ, where m is the order of the transmitted light. Free Spectral Range FSR of Optical Etalon 100 1 Can be expressed as: Δλ=λ 2 / (2nh), or expressed in frequency: Δν=c / (2nh), where c is the speed of light. The peak frequency of transmitted light can be expressed as: ν=mc / (2nh), where m is the interfere...

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Abstract

A spectrum analysis device comprises a tunable Fabry-Perot filter (400), a tunable acoustooptic filter (500), a first photodetector (84), a second photodetector (86), and a system control and data analysis system (92). Incident light (76) is filtered first through the tunable Fabry-Perot filter (400), a light beam (78) output by the tunable Fabry-Perot filter (400) is filtered through the tunable acoustooptic filter (500), the tunable acoustooptic filter (500) outputs two linearly polarized light beams (80, 82) with mutually perpendicular polarization states and having a certain separated included angle, and the two linearly polarized light beams (80, 82) are respectively received by the first photodetector (84) and the second photodetector (86). The system control and data analysis system (92) is used by the spectrum analysis device for detecting the power and spectrum of the incident light (76). The spectrum analysis device has characteristics of absence of mechanical moving parts, stable and reliable performance, small sizes, easiness for mounting and production and the like, meets requirements of small sizes and extreme environments, and may be widely applied in the fields of lasers, optical testing, optical fiber communications, biological and medical instruments, optical fiber sensor networks and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, in particular to an optical spectrum analysis device. Background technique [0002] Because traditional gratings can have very high spectral resolution in a large spectral range, traditional optical spectrum measurement and analysis equipment generally uses reflective or transmissive gratings. The disadvantage is that it generally needs to use a precision stepping motor to drive the grating to scan. Therefore, the commonly used grating spectral analysis equipment has a relatively large size, is easily affected by mechanical vibration, and is expensive. [0003] The traditional optical Fabry-Perot etalon is a filter device made by the principle of multi-beam interference. There are two main types: one is air-spaced, and the other is optical glass-spaced. Through the multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/45G02F1/1347G02F1/1333G02F1/11
CPCG02F1/33G01J3/0224G02F2001/213G01J3/26G01J3/32G02B26/001G02F2201/58G01J3/18G02B26/00G01J3/1256G02F1/11G02F1/213
Inventor 高培良
Owner GP PHOTONICS INC
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