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首页> 外文会议>Novel Optical Systems Design and Optimization X; Proceedings of SPIE-The International Society for Optical Engineering; vol.6668 >Design of a Wavelength-Tunable Light Source Using an Acousto-Optic Tunable Filter
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Design of a Wavelength-Tunable Light Source Using an Acousto-Optic Tunable Filter

机译：使用声光可调滤光片的波长可调光源的设计

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We report on the design and performance of a wavelength-tunable light source for illumination of fluorescent samples. The requirements included a maximum possible irradiance at the sample, rapid and continuous tuning between wavelengths over the range of 400-800 nm with 10-40 nm wide spectral output pass bands, 3 dB out-of-band spectral rejection, and coupling of the light into a fiber bundle for delivery to the sample. We selected an acousto-optic tunable filter (AOTF) for spectral tuning and a xenon arc lamp as the input source in this application. The tuning range of the AOTF was 450-750 nm, necessitating the use of additional narrow-band interference filters to tune across the entire 400-800 nm range. The AOTF had a 4.2° separation angle between the diffracted and non-diffracted beams. In order to achieve the best out-of-band rejection possible and to avoid overlap of the beams, the input source must diverge less than half the separation angle. The active aperture of the AOTF was 10 mm × 10 mm. The optical design included separate beam paths for the AOTF and interference filters that resulted in optimizing the throughput for each case and matching both beams to the numerical aperture of the fiber bundle.We discuss the design process, our prototype system, and issues to be addressed for use of an AOTF in fluorescent excitation applications.
机译：我们报告了用于荧光样品照明的波长可调光源的设计和性能。要求包括最大可能的样品辐照度，在400-800 nm范围内的波长之间连续快速调谐，具有10-40 nm宽光谱输出通带，3 dB带外光谱抑制以及耦合进入纤维束中以传送至样品。在此应用中，我们选择了用于光谱调谐的声光可调滤波器（AOTF）和氙弧灯作为输入源。 AOTF的调谐范围为450-750 nm，因此有必要使用额外的窄带干涉滤光片在400-800 nm的整个范围内进行调谐。 AOTF在衍射光束和非衍射光束之间具有4.2°的分离角。为了获得最佳的带外抑制并避免光束重叠，输入源的发散度必须小于分离角的一半。 AOTF的有效孔径为10 mm×10 mm。光学设计包括用于AOTF和干涉滤光片的单独光束路径，从而优化了每种情况的通量，并使两个光束都与光纤束的数值孔​​径匹配。我们讨论了设计过程，原型系统以及需要解决的问题用于在荧光激发应用中使用AOTF。

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