Design of a Prism to Compensate the Image-shifting Error of the Acousto-optic Tunable Filter

Abstract

The Acousto-Optic Tunable Filter (AOTF) is a high-speed full-field monochromator which generates two spectrally filtered light beams with ordinary and extraordinary polarization state. The AOTF is widely used to build full-field spectral imaging systems or a spectral domain interferometer. The angle of diffracted light in the AOTF changes according to the scanning of wavelength, which causes an image shift on the CCD plane. An analytic design of a prism system to compensate for the image shift is proposed in this paper. Analysis of light paths in a prism and experimental results verified a proposed compensation method. Experimental results agreed with simulation results based on the suggested prism model. Image shifting errors of ordinary and extraordinary rays were simultaneously minimized at optimal conditions with the designed prism.

Определение Аберрационных Характеристик Оптических Систем, Содержащих Акустооптические Дифракционные Элементы

“…еще и АО-элементы, препятствует дальнейшему развитию и внедрению таких ОС. Попытки устранения искажений в АО-системах предпринимались [6][7][8], но без теоретической основы удавалось компенсировать или учесть лишь некоторые наиболее явные из них, например хроматический сдвиг изображения. Важность разработки общих методов расчета ОС, содержащих АО-элементы, показывает пример создания эндоскопического АО-спектрометра [9]: использование предельно упрощенной модели АО-фильтра позволило радикально улучшить оптические характеристики.…”

Long-distance coherent detection system based on dual-channel swept source with micro-ring filters

“…The second type is the electronically tuned swept-source laser: This includes techniques that change the current in different parts of a Semiconductor Optical Amplifier (SOA) to adjust the gain and refractive index, thus tuning the wavelength, 5 and methods that use the acousto-optic effect in crystals via an Acousto-optic Tunable Filter (AOTF) to modulate the wavelength. [6][7][8] The third type is the external cavity tunable laser: These lasers use an external cavity with a tunable component, such as a Micro-Electro-Mechanical Systems (MEMS) mirror or a diffraction grating, to select the output wavelength. This approach can achieve high precision in sweeping and can cover a wide tuning range.…”

The visible to the near infrared narrow band acousto-optic tunable filter and the hyperspectral microscopic imaging on biomedicine study

“…It has many attractive features such as real-time electronic tuning with fast scan rate, wide tuning range, large throughput, etc. As such, AOTFs have been widely used in tuning dye lasers, optical calculation, spectral analysis, hyperspectral imaging and other related areas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Although many kinds of AOTF (based on the crystal or optical fiber) are commercially available, scientists have been looking for ways to develop an AOTF with better performance, such as narrower selected spectral bandwidth, satisfactory image resolution, little beam shift with the tuning central optical wavelength of the diffracted light.…”