Imaging, Spectroscopic, High-Contrast, and Interferometric Instrumentation

Advanced collinear LiNbO3 acousto-optical filter for astrophysical spectroscopy in the near-ultraviolet: exploring high-spectral resolution

[+] Author Affiliations
Alexandre S. Shcherbakov, Adán Omar Arellanes, Emanuele Bertone

National Institute for Astrophysics, Optics and Electronics (INAOE), Luis Enrique Erro # 1, Tonantzintla, Puebla 72000, Mexico

J. Astron. Telesc. Instrum. Syst. 1(4), 045002 (Dec 10, 2015). doi:10.1117/1.JATIS.1.4.045002
History: Received April 20, 2015; Accepted October 13, 2015
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Abstract.  We explore the potentiality of using an advanced collinear LiNbO3 acousto-optical filter as a dispersive element for a high-resolution optical spectrograph. Our analysis is focused on weak optical signals in the blue to near-ultraviolet range accessible to ground-based facilities. We examine the phenomenon affecting the filter transmission efficiency and its spectral resolution, namely, the light-induced absorption and photorefraction. A new nonlinear approach is used to determine the performance of this collinear LiNbO3 filter governed by acoustic waves of finite amplitude. The highest available spectral resolution attains δλ=0.15 at λ=370nm (the resolving power R25,000), with an efficiency of 11%, or δλ=0.18 at λ=532nm (R30,000), with an efficiency of 33%. A slight decrease in the spectral resolution would imply a significant increase in transmission efficiency. Then, we carried out proof of principle experiments with the collinear filter based on the congruent LiNbO3 crystal of 6.3-cm length at λ=405 and 440 nm to verify our analysis and estimations. Potential applications are tackling many issues in astronomy, from detailed abundance analysis in a variety of targets to precise radial velocity measurement.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Alexandre S. Shcherbakov ; Adán Omar Arellanes and Emanuele Bertone
"Advanced collinear LiNbO3 acousto-optical filter for astrophysical spectroscopy in the near-ultraviolet: exploring high-spectral resolution", J. Astron. Telesc. Instrum. Syst. 1(4), 045002 (Dec 10, 2015). ; http://dx.doi.org/10.1117/1.JATIS.1.4.045002


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