Prof. Weijun Chang Profile

Prof. Weijun Chang

at Xi'an Institute of Applied Optics

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 12 April 2023 Paper

Design on long-wave infrared diffractive optical system

Weijun Chang, Ting Sun, Ke Zhou, Mingxuan Zhang, Xuanzhi Zhang

Proceedings Volume 12565, 125652T (2023) https://doi.org/10.1117/12.2662792

KEYWORDS: Diffraction, Design and modelling, Optical surfaces, Infrared imaging, Diffractive optical elements, Modulation transfer functions, Imaging systems, Chromatic aberrations

Read Abstract +

The abbe number of diffractive optical element is negative, which is opposite to that of traditional refraction optical element. So diffractive optical element has unique advantages on achromatic and thermal compensation. Therefore, it can be applied to diffractive and refraction hybrid optical systems to simplify the optical structure and improve the imaging quality. However, the diffraction efficiency of the single-layer diffractive optical element depends on the wavelength mightily , However, the diffraction efficiency of the design order of the double-layer diffractive optical element in the whole working band is coincident basically and more than 90%, which can significantly suppress the stray light of the non-design order and advance the image contrast. Therefore, the double-layer diffractive optical elements are adopted in this long-wave infrared wide waveband optical system, and the design idea of superposing the diffractive surface on the aspheric surface is proposed. Only two lenses and two materials were used to realize the optimal design. By matching the microstructure parameters of the double-layer diffractive elements ,the diffraction efficiency of the whole working band reached more than 97%. Imaging quality analysis shows that the chromatic aberration of 8μm-14μm is well corrected. the secondary spectrum is well controlled also, and the MTF is close to the diffraction limit, which meets the design requirements.

Proceedings Article | 12 April 2023 Paper

Optical system design of high-resolution and asymmetric Czerny-Turner spectrometer on near-infrared broadband

Zijian Yang, Guoqi Teng, Huamei Yang, Weijun Chang

Proceedings Volume 12565, 125650E (2023) https://doi.org/10.1117/12.2661620

KEYWORDS: Spectroscopy, Diffraction gratings, Spectral resolution, Optical design

Read Abstract +

Aiming at the requirement of high-precision spectral measurement of transient light source, pulse laser wavelength and spectral resolution in pm order and flash duration in ns-ms order, according to the working principle of the Czerny-Turner spectrometer, a cross-asymmetric optical system of Czerny-Turner spectrometer with a spectral range of 800nm-1800nm is designed. Through the design requirements of resolution and spectral range, the light splitting scheme of scanning grating tower with three gratings spliced is determined. The initial structure calculation includes the calculation of single-shot spectral range, characteristic wavelength and scanning angle, focal length and aperture of collimator, focal length and aperture of focusing mirror. Then, according to the above calculation results, the Zemax optical design software of Zemax Company is used to establish multiple structures to simulate the rotating scanning of grating tower, so as to realize the grating and splitting of spectrum and carry out the simulation optimization of the system. In order to correct the aberration of optical system of spectrometer, x-y polynomial free-forms surface is introduced into the optical system, which is called corrective mirror. The design results show that the optical system of the spectrometer meets the design requirements and has excellent performance. Under the conditions of slit width of 25 μm, grating constant of 0.8333 μm/ line, F Number 4.6, the optical system of the spectrometer can achieve a resolution better than 0.1 nm at a center wavelength of 800nm. This design method is also applicable to the structural design of other wavebands, and has guiding significance for the design of broadband grating spectrometer.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years