CN205067881U - Super diffraction imaging system of haplopore footpath beam split - Google Patents

Abstract

The utility model provides a super diffraction imaging system of haplopore footpath beam split, this imaging system include the shu jing that contracts, two -dimentional scanning device, N level beam splitting subsystem and the focusing mirror of following the light path and setting gradually, the incident light obtains the compression through the shu jing that contracts, and the light path after N level beam splitting subsystem will compress through the amplitude beam split finally is divided into a N beamlet array, and the speculum of wherein all setting up a set of parallel in every beam splitting subsystem is used for adjusting the optical distance of each beamlet for a NN beamlet array is in constitute equiphase ripples true face SK before the focusing mirror, behind the line focus mirror, a N beamlet carries out the super diffraction of the final realization of self -interference. The utility model discloses can be used to the little relative aperture optical imaging system of heavy -calibre, realize the formation of image of super diffraction through beam split multi -aperture from relevant super diffraction imaging technique to through a N beam split, form N super diffraction effect doubly.

Description

A kind of single aperture light splitting surpasses diffraction imaging system

Technical field

The utility model relates to a kind of single aperture light splitting and surpasses diffraction imaging system.

Background technology

In traditional super long distance high-resolution imaging system, by the restriction of volume weight, optical system bore is also corresponding to be restricted, in this case, when optical system focal length exceedes certain numerical value, by the impact of desirable unthreaded hole diffraction, Optical Resolution of Imaging System cannot improve further.Impact in space-based imaging system is particularly evident, for the imaging system of geostationary orbit, image-forming range is about 36000km, as realized the imaging resolution of ground meter level, optical system focal length is about about hundred meters, and corresponding optical system bore also needs the bore reaching tens meters, even if take lightweight measure, the weight of optical system is also large other about hundred tonnes, and such weight obviously cannot adopt existing transmitting means of transport to finish the work; How can break through the restriction of diffraction-limited in the imaging system of small-bore long-focus, the resolution effectively increasing imaging system becomes a domestic and international important research content.

Utility model content

The utility model is intended to the imaging resolution being realized super diffraction-limited by a kind of special light path design.

The technical solution of the utility model is as follows:

A kind of single aperture light splitting surpasses diffraction imaging system, comprises the beam-shrinked mirror, two-dimensional scanner, N level beam splitting subsystem and the focus lamp that set gradually along light path; Incident light is compressed by beam-shrinked mirror, light path after compression is finally divided into N × N number of beamlet array by amplitude light splitting by N level beam splitting subsystem, wherein all having additional one group of parallel catoptron in each beam splitting subsystem for regulating the light path of each beamlet, making N × N number of beamlet array before described focus lamp, form equiphase ripple true face SK; After line focus mirror, N × N number of beamlet carries out self-interference and finally realizes super diffraction.

In above scheme, the structure of described N level beam splitting subsystem can be identical.

Adopt above single aperture light splitting to surpass the method for the super diffraction of diffraction imaging system realization, comprise the following steps:

1) incident light of angle pencil of ray is compressed;

2) bidimensional scanister is adopted to carry out object point scanning;

3) by the light splitting of N level amplitude, the light path after compression is divided into N × N number of beamlet;

4) regulate N × N number of beamlet light path to aplanatism, etc. period distances;

5) N × N number of beamlet is carried out focusing and mutually interferes by line focus mirror;

6) the Zero-order diffractive spot width through hot spot after being concerned with is compressed and is realized super diffraction-limited.

The utility model has following technique effect:

Can be used for the little relative aperture optical imaging system of heavy caliber, realize super diffraction imaging by light splitting multiple aperture from relevant super diffraction imaging technology, and by N × N number of light splitting, form N super diffraction effect doubly.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of unthreaded hole diffraction effect.

Fig. 2 is that light splitting multiple aperture of the present utility model is from relevant super diffraction imaging technology light path principle figure.

Embodiment

According to unthreaded hole diffraction principle, after the plane light wave K via hole diameter D in Fig. 1, the impact of light diffraction by aperture effect, in its focal plane after lens L focuses on, its transmission function can be expressed as:

$E\left(X\right)=\frac{\exp \left(ikf\right)}{i\mathrm{\λ}f}*\exp \left(\frac{{\mathrm{ikX}}^2}{2f}\right)*\∫E\left(x_0\right)*rect\left(\frac{x_0-h}{D}\right)*\exp (-\frac{i2{\mathrm{\πXx}}_0}{\mathrm{\λ}f}){\mathrm{dx}}_0$

In formula: f is the focal length of lens L, in the intensity distributions of its focal plane position be:

$I\left(X\right)=|E\left(X\right){|}^2=\frac{D^2{\mathrm{sinc}}^2(DX/\mathrm{\λ}f)}{{\mathrm{\λ}}^2{f}^2}$

The width of its Zero-order diffractive spot

As can be seen here, the main and wavelength X of the width of Zero-order diffractive spot, unthreaded hole width D is relevant with focal length of lens f, and wherein f/D is called the F number of optical system, and from above formula, F number shows that more greatly the diameter of Zero-order diffractive spot is larger, and imaging resolution is lower.

The utility model mainly adopts the method for amplitude light splitting to be divided into by light beam for the equiphase beamlet of N × N, and adopts relevant method to obtain the diffraction Airy disk diameter of 1/N.Wherein adopt the mode of beam-shrinked mirror to be compressed into irradiating light beam bore, and through the method for Fig. 2 divided beams, regulate the equivalent optical path of beamlet.

Performing step of the present utility model is as follows:

The incident light of angle pencil of ray is compressed by contracting bundle imaging lens by 1;

2 carry out object point scanning through bidimensional pendulum mirror or other bidimensional scanister;

Light path after compression is divided into several beamlets by amplitude light splitting by 3;

4 regulate several beamlet light paths to aplanatism, wait period distances (namely the plane of incidence of focus lamp is first-class be intervally arranged);

Several beamlets are carried out focusing through synthesis focus lamp by 5 also to be interfered mutually;

6 are compressed through the Zero-order diffractive spot width of hot spot after relevant and are realized super diffraction-limited.

Fig. 2 is the light path principle figure of light splitting multiple aperture from relevant super diffraction imaging technology, wherein L1 and L2 forms contracting bundle telescope, by the angle pencil of ray boil down to arrow beam of light of incidence, after S1 spectroscope, form the two-way light that amplitude is equal, S2 and S3 is for the equivalent optical path of the light path He another road S4 reflected light that regulate S2 catoptron, M1 ~ M4 adopts the light path identical with S1 ~ S4 with P1 ~ P4, light path is divided into 2 × 2 subarrays (for simplicity, array in Fig. 2 after embodiment multiplication directly perceived), equiphase ripple true face SK is formed before focus lamp F, after line focus mirror, 2 × 2 wavelets carry out interfering the super diffraction of final realization.

Claims (2)

1. single aperture light splitting surpasses a diffraction imaging system, it is characterized in that: comprise the beam-shrinked mirror, two-dimensional scanner, N level beam splitting subsystem and the focus lamp that set gradually along light path; Incident light is compressed by beam-shrinked mirror, light path after compression is finally divided into N × N number of beamlet array by amplitude light splitting by N level beam splitting subsystem, wherein all having additional one group of parallel catoptron in each beam splitting subsystem for regulating the light path of each beamlet, making N × N number of beamlet array before described focus lamp, form equiphase ripple true face SK; After line focus mirror, N × N number of beamlet carries out self-interference and finally realizes super diffraction.

2. single aperture light splitting according to claim 1 surpasses diffraction imaging system, it is characterized in that: the structure of described N level beam splitting subsystem is identical.