Baochang Zhao

Using an acousto-optic tunable filters for hyperspectro-polarimetric imaging

Abstract Of all the hyperspectral imaging system using the optical filtering elements available,. AOTF(Acousto-optic tunable filters) is best to choose a filtering optical element that has high-speed spectral selectivity with high resolution, it can greatly reduces the amount of data collection and processing. In this paper , First, the work principle of AOTF was introduced, then described the AOTF imaging system, it covers the spectral band from 400nm to 900nm with a spectral resolution of near 2nm at 400nm and 10nm at 900nm. The device can provide about 2.2° view field angle and 10mm aperture, which included TeO2 crystal, image optical system, a charged coupled device(CCD)camera, rf electronics and control and processing software. Finally the paper presented the results of laboratory image testing.

Design of hybrid diffractive/ refractive optical system by the method of P-W-C

The structure parameter of hybrid diffractive/refractive optical system has been solved by the method of P-W-C. The primary aberration equation for diffractive system has been deduced. Combination of 3 pieces lenses, the diffractive/ refractive hybrid optical system was designed: No.1 and No.3 are common glasses; No.2 is binary optical lenses (BOL). The results show: The Longitudinal Aberration is good in 0.6 and 0.8~0.9 apertures for the lenses. When frequency is 30lp/mm, the modulation transfer function (MTF) is close to diffractive limit in 0.5 field angle; the modulation transfer function (MTF) is close to 0.7 in edge field. The design method can be used for diffractive/ refractive hybrid optical system.