CN-114923589-B - Single-channel multi-stage Fizeau wavelength measuring device

Abstract

The invention discloses a single-channel type multistage Fizeau wavelength measuring device which comprises an optical fiber port, a collimating mirror, an interference cavity, a cylindrical mirror and a linear array detector which are coaxially arranged in sequence along a main optical path. The laser to be measured is incident to the wavemeter through the optical fiber port, is collimated by the collimating lens, is incident to the Fizeau interference cavity to interfere, is emitted from the rear end surface of the interference cavity, is converged by the cylindrical lens to form interference fringes in the linear array detector. Compared with the traditional wavelength measurement system, the single-channel type multistage Fizeau wavelength measurement device provided by the invention has a simpler and more stable structure, and can realize single-cavity wavelength high-precision measurement through partition coating.

Inventors

• LI JIANXIN
• LIU YIXUAN
• MA SHIBANG
• YANG KUN
• GUO RENHUI
• MA JUN
• ZHU RIHONG
• HE YONG
• WANG QING

Assignees

• 南京理工大学

Dates

Publication Date

20260505

Application Date

20220520

Claims (2)

1. 1. A single-channel type multistage Fizeau wavelength measuring device is characterized in that a Shan Qiangbo long meter comprises an optical fiber port (1), a collimating lens (2), a Fizeau interference cavity (3), a cylindrical lens (4) and a linear array detector (5) which are coaxially arranged in sequence along a main light path, wherein all optical elements are coaxial and have equal heights relative to the plane of an instrument base; After passing through the collimating mirror (2), the light emitted by the optical fiber port (1) is incident into the Fizeau interference cavity (3) to interfere with the Fizeau interference cavity, and then the light exits from the rear bottom surface of the Fizeau interference cavity (3) and is focused to the linear array detector (5) through the cylindrical mirror (4); The Fizeau interference cavity (3) comprises a base plate (31), a hollow cylinder (32) and a cover plate (33) which are sequentially arranged and glued along the direction of a light path, wherein a step block is arranged in the hollow cylinder (32), the rear bottom surface of the base plate (31) is glued with the front bottom surface of the step block, and the rear bottom surface of the step block is plated with a partial reflection and partial transmission film; the front bottom surface and the rear bottom surface of the step block have a certain included angle; the step block comprises a first step (34), a second step (35) and a third step (36) which are sequentially stacked from top to bottom, wherein the cross section of the three steps is rectangular, and the sides of the rectangle along the cross section direction of the light beam are short sides; the lengths of the first step (34), the second step (35) and the third step (36) are the same, and the width of the first step (34) is2 times that of the second step (35) and the third step (36).
2. 2. Single-channel multi-stage fizeau wavelength measurement device according to claim 1, characterized in that the fiber port (1) is located at the focal position of the collimator mirror (2).

Description

Single-channel multi-stage Fizeau wavelength measuring device Technical Field The invention belongs to the technical field of optical precision measurement, and particularly relates to a single-channel type multistage Fizeau wavelength measurement device. Background The laser wavelength is widely used as a measurement reference value for measuring displacement, flatness, roughness, vibration, gravity acceleration, length, speed, angle, straightness, perpendicularity and the like, and the accurate measurement of the wavelength can ensure the measurement accuracy, and is a key technology for magnitude tracing. In addition, laser wavelength measurement is also widely used in the field of atmospheric monitoring. The measurement of the wind speed of the atmospheric wind field can be obtained by measuring the drift of the wavelength of scattered laser light and combining the Doppler effect, and the research can be applied to the fields of astronomy and national defense. Therefore, it is highly desirable to develop high precision, high resolution, and broad spectrum laser wavemeters. The traditional Michelson and FP interferometers have low measurement accuracy and can only be used for continuous laser measurement. The multi-beam Fizeau interferometer can rapidly and efficiently realize high-precision measurement of wavelength and wind speed of an atmospheric wind field, and domestic research on a wavelength measuring device based on the multi-beam Fizeau interferometer is still in a starting stage, so that further intensive research is urgently needed. Meanwhile, the existing wavelength measuring device needs a plurality of interference cavities, the light path is complex, and the energy utilization rate is low. Disclosure of Invention The invention aims to solve the problems in the prior art and provides a single-channel type multistage Fizeau wavelength measuring device. The technical scheme for realizing the purpose of the invention is that the single-channel multi-stage Fizeau wavelength measuring device comprises a Shan Qiangbo long meter, a single-channel multi-stage Fizeau wavelength measuring device, a single-stage Fizeau wavelength measuring device and a single-stage Fizeau wavelength measuring device, wherein the single-stage multi-stage Fizeau wavelength measuring device comprises an optical fiber port, a collimating mirror, a Fizeau interference cavity, a cylindrical mirror and a linear array detector which are coaxially arranged along a main optical path in sequence; After passing through the collimating mirror, the light emitted by the optical fiber port is incident into the Fizeau interference cavity to interfere, and then is emitted from the rear bottom surface of the Fizeau interference cavity to be focused to the linear array detector through the cylindrical mirror to form interference fringes. Further, the fiber port is located at a focal position of the collimator lens. Further, the Fizeau interference cavity comprises a base plate, a hollow cylinder and a cover plate which are sequentially arranged and glued along the direction of a light path, wherein a step block is arranged in the hollow cylinder, the rear bottom surface of the base plate is glued with the front bottom surface of the step block, the rear bottom surface of the step block is plated with a partial reflection and partial transmission film, and the front bottom surface of the cover plate is plated with a partial reflection and partial transmission film. Compared with the prior art, the invention has the remarkable advantages that: (1) The single-channel light path has high energy utilization rate and simple installation and adjustment; (2) The high-precision measurement is realized by utilizing multistage Fizeau cavity iteration without reference laser; (2) High-precision measurement of broadband wavelength can be realized through partition coating. The invention is described in further detail below with reference to the accompanying drawings. Drawings Fig. 1 is a schematic structural diagram of a single-channel, multi-stage fizeau wavelength measurement device of the present invention. FIG. 2 is a schematic diagram of the Fizeau interferometric cavity structure of the invention, wherein FIG. (a) is a front view and FIG. (b) is a side view. Detailed Description The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present invention), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between t