A small f-number multi-wavelength standard spherical reference lens group

A standard spherical surface, multi-wavelength technology, applied in the direction of lens, instrument, installation, etc., can solve the problem of difficult adjustment process of standard spherical reference lens assembly

Inactive Publication Date: 2017-12-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a small F-number multi-wavelength standard spherical reference lens group, which solves the problem that the traditional standard spherical reference lens group can only be used for single-wavelength detection, and also solves the difficulty in adjusting the standard spherical reference lens group. question

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  • A small f-number multi-wavelength standard spherical reference lens group
  • A small f-number multi-wavelength standard spherical reference lens group

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Embodiment 1

[0023] A small F-number multi-wavelength standard spherical reference lens group adopts 3 lenses, including a cemented doublet positive lens 1, a second negative lens 4, and a second positive lens 5 arranged in sequence with common optical axes; the doublet positive lens 1 includes The first negative lens 2 and the first positive lens 3, wherein the first negative lens 2 is a convex-concave lens, and the first positive lens 3 is a biconvex lens; the concave surface of the first negative lens 2 is cemented with the convex surface of the first positive lens 3, and the second negative lens The lens 4 is a convex-concave lens, and the second positive lens 5 is a convex-concave lens; the convex surface of the second negative lens 4 is opposite to the first positive lens 3 , and the concave surface of the second negative lens 4 is opposite to the convex surface of the second positive lens 5 .

[0024] combine figure 1 , the parallel light beam enters the convex surface of the first ...

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Abstract

The invention discloses a small F-number multi-wavelength standard spherical reference lens group, the working wavelengths are 632.8nm, 543.5nm and 532nm, and the achromatism of the lens group is realized by using crown glass ZK7 with low dispersion and flint glass ZF6 with high dispersion; It adopts 3-piece lens design, which is composed of a doublet positive lens, a negative lens and a positive lens whose last surface is a standard spherical surface; the design theoretical values ​​of the aperture, F number and vertex focal length of the reference lens group are 100mm, F / 3 and 254.7mm respectively ;Except for the last mirror in the reference lens group, all the mirrors are coated with three-point anti-reflection coatings of 632.8nm, 543.5nm and 532nm; the combination of double-glued positive lens and negative lens is used to realize the approximate afocal of the optical path structure and reduce the The sensitivity of the coincidence error between the focal point and the center of curvature of the end surface changes with the distance between the mirrors is improved, and it is convenient for the assembly and adjustment of small F-number standard spherical lens groups.

Description

technical field [0001] The invention belongs to the field of optical instruments, and in particular relates to a small F-number multi-wavelength standard spherical reference lens group. Background technique [0002] Optical interference testing technology has a very wide range of applications in the surface shape of optical components, the characteristic parameters of optical materials and the performance testing of optoelectronic systems due to its advantages of high precision and non-contact non-destructive measurement. [0003] Yeou-Yen Cheng et al. proposed the principle of two-wavelength phase shifting interferometry in "Two-wavelength phase shifting interferometry" (APPLIED OPTICS, 24(23): 4539-4543, 1984). By solving the synthetic wavelength phase, the single While the wavelength phase-shifting interferometer has a test range, it can retain high test accuracy. [0004] When the interferometer detects the spherical surface shape, it needs to be equipped with a standar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00G02B7/02G02B1/00
Inventor 高志山成金龙王凯亮王伟王帅袁群杨忠明朱丹窦建泰叶井飞
Owner NANJING UNIV OF SCI & TECH
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