We developed a cryogenic objective mirror [Toratani-Fujiwara (TORA-FUJI) mirror] with a 36-μm field of view (FOV) radius and a 0.93 numerical aperture. The latest reported cryogenic objective mirror (INAGAWA mirror) under a superfluid-helium immersion condition had a nearly maximum numerical aperture (0.99) and was perfectly achromatic. However, its FOV radius was restricted to 1.5 μm, mainly due to coma aberration. In the TORA-FUJI mirror, correcting coma aberration realized the 36-μm FOV radius. In addition, the remaining four Seidel aberrations and the chromatic aberrations were sufficiently corrected. To evaluate the optical performance, the cryogenic fluorescence imaging of individual dyes was performed with the TORA-FUJI mirror at a 685-nm excitation wavelength. This result shows that the TORA-FUJI mirror in superfluid helium at 1.8 K exhibits nearly diffraction-limited performance in the FOV region.
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15 July 2019
Research Article|
July 15 2019
Aberration-corrected cryogenic objective mirror with a 0.93 numerical aperture
Masanori Fujiwara;
Masanori Fujiwara
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Takaki Ishii;
Takaki Ishii
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Keita Ishida;
Keita Ishida
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Yasuharu Toratani;
Yasuharu Toratani
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Taku Furubayashi;
Taku Furubayashi
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Michio Matsushita;
Michio Matsushita
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
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Satoru Fujiyoshi
Satoru Fujiyoshi
a)
Department of Physics, Tokyo Institute of Technology
, Meguro, Tokyo 152-8550, Japan
a)Author to whom correspondence should be addressed: fujiyoshi@phys.titech.ac.jp
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a)Author to whom correspondence should be addressed: fujiyoshi@phys.titech.ac.jp
Appl. Phys. Lett. 115, 033701 (2019)
Article history
Received:
May 18 2019
Accepted:
June 25 2019
Citation
Masanori Fujiwara, Takaki Ishii, Keita Ishida, Yasuharu Toratani, Taku Furubayashi, Michio Matsushita, Satoru Fujiyoshi; Aberration-corrected cryogenic objective mirror with a 0.93 numerical aperture. Appl. Phys. Lett. 15 July 2019; 115 (3): 033701. https://doi.org/10.1063/1.5110546
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