Zhejiang University

Xiao Huang

Jian Bai

Lei Zhao

Jing Hou

Jia Wang

Binjie Lu

Xiangdong Zhou

A phase retrieval detection device based on diffraction information fusion of a Fresnel zone plate (FZP) () is provided, including a laser (), an attenuation mirror (), a micro-objective (), a pinhole filter (), a collimating objective (), an element () to be detected, an FZP (), and an image acquisition device () that are sequentially arranged along a light path. The phase retrieval detection device uses the FZP () as a light beam convergent element instead of a conventional lens, and makes an acquired diffraction spot contain more diffraction information by virtue of a multi-focus characteristic of the FZP (). Based on a classical iterative phase retrieval method, a phase retrieval method based on the diffraction information fusion of the FZP () uses a diffraction light intensity distribution modulated by the FZP for retrieval to reconstruct a wider band of a wavefront to be detected.

Phase retrieval detection device and method based on diffraction information of fresnel zone plate

A 4K high-resolution panoramic annular optical system includes a panoramic annular lens head unit, a subsequent lens group, and a 4K sensor (SE) that is coaxially installed. The panoramic annular lens head unit includes a first lens (PALIPAL) and a second lens (PAL). The subsequent lens group includes a third lens (RL), a fourth lens (RL), a fifth lens (RL), a sixth lens (RL), a seventh lens (RL), an eighth lens (RL), and a ninth lens (RL) that are arranged in order from an object plane to an image plane. The first lens (PAL) and the fifth lens (RL) are meniscus glass lenses with positive refractive power. The six lens (RL) and the ninth lens (RL) are meniscus glass lenses with negative refractive power, and the second lens (PAL), the fourth lens (RL), the seventh lens (RL), and the eighth lens (RL) are biconvex lenses with positive refractive power.

4K high-resolution panoramic annular optical system

The disclosure provides a device for detecting a wavefront error by modal-based optimization phase retrieval using an extended Nijboer-Zernike (ENZ) theory. The detection device includes a point light source (), a half mirror (), a lens () to be tested, a plane mirror () and an image sensor (). The wavefront error of the component under test is characterized by using a Zernike polynomial, and a Zernike polynomial coefficient is solved based on an ENZ diffraction theory. The present disclosure realizes the one-time full-aperture measurement on the wavefront error of a large-aperture optical component, and can use a partially overexposed image to achieve accurate wavefront error retrieval. Meanwhile, the present disclosure overcomes the contradiction between underexposure and high signal-to-noise ratio (SNR) caused by a limited dynamic range when the image sensor () acquires an image. The detection device is simple and does not have high requirements for the experimental environment.

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Zhejiang, China

Xiao Huang