Improved reflective/diffractive hybrid wide field Cassegrain telescope

A Cassegrain and telescope technology, applied in telescopes, optics, instruments, etc., can solve the problems of small field of view and no elimination of off-axis aberrations, and achieve the effects of improved imaging quality, easier processing and production, and good imaging effects.

Inactive Publication Date: 2012-08-01
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The general Cassegrain system mirror has no chromatic aberration, and can work in a wide band from ultraviolet to infrared. Although it has a good imaging quality for the point on the axis, the light is reflected by the mirror and produces central

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  • Improved reflective/diffractive hybrid wide field Cassegrain telescope
  • Improved reflective/diffractive hybrid wide field Cassegrain telescope
  • Improved reflective/diffractive hybrid wide field Cassegrain telescope

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Embodiment Construction

[0009] Such as figure 2 As shown, the present invention comprises primary mirror 1, secondary mirror 2, shading plate 3 and follow-up correction lens group 4, is characterized in that the left side of primary mirror 1 is secondary mirror 2, and the back side of secondary mirror is connected with shading plate 3, primary mirror The right side of the right side is the follow-up correction lens group 4. The follow-up correction lens group is composed of three lenses arranged in sequence. These three lenses are all made of ordinary materials. The primary mirror and the secondary mirror are aspheric mirrors and only quadric mirrors. The eclipse has a diffractive optical element, which is beneficial to correct system aberrations.

[0010] Such as image 3 As shown, the MTF curves of all fields of view of the present invention are close to the diffraction limit, the MTF value at 50 lp / mm is above 0.4, and the maximum distortion is <0.025%. The maximum spatial frequency on the diff...

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Abstract

An improved reflective/diffractive hybrid wide field Cassegrain telescope is characterized in that a secondary lens is arranged on the left side of a prime lens; a light screen is connected to the back of the secondary lens; a follow-up corrective lens assembly is arranged on the right side of the prime lens; the follow-up corrective lens assembly consists of three sequential lenses that are all made of ordinary materials; the prime lens and the secondary lens are aspheric lenses and merely conicoid lenses, and diffractive optical elements are etched on the lenses, so as to facilitate correcting the systematic aberration. The invention has the characteristics that: firstly, the prime lens and the secondary lens are additionally provided with the diffractive optical elements on the basis of the conicoid, so as to meet the requirements of systematic wide field and improve the imaging quality; secondly, satisfactory imaging effect can be achieved by adopting the special materials or the complicated surface shapes in the design; and thirdly, as the diffractive optical elements in the system are much easier to machine and manufacture, no further requirement on the manufacturing technology is added.

Description

technical field [0001] The invention relates to a Cassegrain telescope, in particular to an improved inverse / diffraction hybrid large-field Cassegrain telescope. Background technique [0002] The Cassegrain telescope is a typical type of catadioptric telescope system, which can take into account the advantages of both refracting and reflecting telescopes. The system is composed of two reflectors, the primary mirror and the secondary mirror. The incident light is firstly reflected by the primary mirror to reach the secondary mirror, and then reflected by the secondary mirror again through the central opening of the primary mirror for final imaging. Such as figure 1 As shown, the primary mirror and secondary mirror of the traditional Cassegrain telescope are composed of a large paraboloid and a small hyperboloid mirror respectively. Because the optical path through the reflective objective lens is folded inside the system, compared with the refractive objective lens, the len...

Claims

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Application Information

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IPC IPC(8): G02B23/00G02B13/18
Inventor 高益庆李芸罗宁宁肖孟超龚勇清杨娟
Owner NANCHANG HANGKONG UNIVERSITY
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