A compact spectroscopic imaging device consisting of a planar reflection grating lens, a probe fiber array, and a two-dimensional image sensor was proposed and discussed. Reflected or luminescent lights from a subject are coupled to the probe fibers, guided to fiber output ends, radiated into the air, diffracted by the grating lens with wavelength-dependent angle, and focused onto lines on the image sensor. Two-dimensional intensity distribution on the image sensor can give one-dimensional spectrum distribution along a specified direction. A grating lens was designed with a fiber array and a CCD image sensor for 100-nm wavelength range and 10-mm fiber array width. A spectral resolution of 5 nm and a spatial resolution of 0.25 mm were experimentally confirmed.
© 2003 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
(090.2890) Holography : Holographic optical elements
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.0230) Optical devices : Optical devices
Shogo Ura, Fumikazu Okayama, Koichi Shiroshita, Kenzo Nishio, Takahiro Sasaki, Hiroshi Nishihara, Tsutom Yotsuya, Masato Okano, and Kazuo Satoh, "Planar Reflection Grating Lens for Compact Spectroscopic Imaging System," Appl. Opt. 42, 175-180 (2003)