Development of a universal tunable filter for future solar observations

M. Hagino; K. Ichimoto; G. Kimura; Y. Nakatani; T. Kawate; K. Shinoda; Y. Suematsu; H. Hara; T. Shimizu

doi:10.1117/12.2055728

28 July 2014 Development of a universal tunable filter for future solar observations

M. Hagino, K. Ichimoto, G. Kimura, Y. Nakatani, T. Kawate, K. Shinoda, Y. Suematsu, H. Hara, T. Shimizu

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91515V (2014) https://doi.org/10.1117/12.2055728
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

We have developed a new narrowband tunable filter to perform imaging spectroscopy of the solar chromosphere. Using Liquid Crystal Variable Retarders (LCVRs) as the tuning elements for wavelength, wide-band polarizers and super achromatic half-wave plates, it is possible to make high speed tuning (about 0.1Sec), to exclude mechanical drives (and oil tank), and to cover a wide wavelength range (510-100nm). This filter builds up with seven stages each consisting of a pair of calcites, LCVR, half-wave plates and linear polarizer. The full width at half maximum (FWHM) of the filter transmission is about 0.025nm at 656.3nm.We demonstrate that the concept of the universal tunable filter using the LCVR's as tuning elements is highly promising for future application to space mission and ground based observations.

Citation Download Citation

M. Hagino, K. Ichimoto, G. Kimura, Y. Nakatani, T. Kawate, K. Shinoda, Y. Suematsu, H. Hara, and T. Shimizu "Development of a universal tunable filter for future solar observations", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515V (28 July 2014); https://doi.org/10.1117/12.2055728

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