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首页> 外文会议>International conference on applications of optics and photonics >An advanced arrangement of the optical spectrograph based on acousto-optical and cross-disperser techniques for astronomical applications
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An advanced arrangement of the optical spectrograph based on acousto-optical and cross-disperser techniques for astronomical applications

机译：基于声光和交叉色散技术的光学光谱仪的先进装置，用于天文应用

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We develop a new avenue to creating the optical spectrometer for the Guillermo Haro astrophysical observatory (Mexico), which combines specifically progressed prism spectrometer with modern acousto-optical approach in the frame of a joint instrument. This schematic arrangement includes two principal novelties. First, we exploit recently developed acousto-optical nonlinearity of the two-phonon light scattering in crystals with linear acoustic losses, which admits an additional physical degree of freedom. This effect allows us to use nonlinear acousto-optical effect for linear processing of optical signals in parallel regime within all the visible range. Similar effect is based on the possibility for tuning the frequency of elastic waves and admits the nonlinear apodization improving the dynamic range. Secondly, we are using the cross-disperser technique with acousto-optical processing for the first time to our knowledge. Additionally, the acousto-optical spectrometers can provide almost 100% efficiency in the acousto-optical interaction in the optimized regime. In the case of 4% Mg doped LiNbO_3 crystal the absorption edge can be shifted down to 370 nm for limited intensity of incoming light. The observation window of optical spectrometer in that observatory is ~ 9 cm, so that the theoretical estimations of maximal performances for a low-loss LiNbO3-crystal for this optical aperture at 405 nm give the spectral resolution 0.0523 A, resolving power 77,400, and number of spots 57,500. The illustrative proof-of-principle experiments with available for us 6-cm LiNbO_3-crystal have been performed and demonstrated the spectral resolution 0.0782 A at 405 nm and resolving power 51,790.
机译：我们为吉列尔莫·哈罗天体物理观测台（墨西哥）开发了一种创建光学光谱仪的新途径，该光谱仪在联合仪器的框架中将经过专门开发的棱镜光谱仪与现代声光方法结合在一起。该示意性布置包括两个主要的新颖性。首先，我们利用最近开发的具有线性声损耗的晶体中的两个声子光散射的声光非线性，这允许额外的物理自由度。这种效应使我们能够使用非线性声光效应对所有可见范围内的并行状态下的光信号进行线性处理。类似的效果是基于调整弹性波频率的可能性，并承认非线性切趾可改善动态范围。其次，据我们所知，我们第一次将交叉色散技术与声光处理结合使用。此外，在优化方案中，声光光谱仪可以在声光相互作用中提供近100％的效率。在掺杂4％Mg的LiNbO_3晶体的情况下，对于有限的入射光强度，吸收边可向下移至370 nm。该天文台中的光谱仪的观察窗口约为9 cm，因此，对于该损耗孔径在405 nm的低损耗LiNbO3-晶体的最大性能的理论估计给出了光谱分辨率0.0523 A，分辨力77,400和数量点57.500。已经进行了可用于我们的6厘米LiNbO_3-晶体的说明性原理验证实验，并证明了其在405 nm处的光谱分辨率为0.0782 A，分辨力为51,790。

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