title: Design and construction of an Offner spectrometer based on geometrical analysis of ring fields.
abstract: A method to obtain an aberration-corrected Offner spectrometer without ray obstruction is proposed. A new, more efficient spectrometer optics design is suggested in order to increase its spectral resolution. The derivation of a new ring equation to eliminate ray obstruction is based on geometrical analysis of the ring fields for various numerical apertures. The analytical design applying this equation was demonstrated using the optical design software Code V in order to manufacture a spectrometer working in wavelengths of 900-1700 nm. The simulation results show that the new concept offers an analytical initial design taking the least time of calculation. The simulated spectrometer exhibited a modulation transfer function over 80% at Nyquist frequency, root-mean-square spot diameters under 8.6 μm, and a spectral resolution of 3.2 nm. The final design and its realization of a high resolution Offner spectrometer was demonstrated based on the simulation result. The equation and analytical design procedure shown here can be applied to most Offner systems regardless of the wavelength range.
authors.affiliation: Department of Physics, KAIST (Korea Advanced Institute of Science and Technology), Daejeon 305-701, South Korea.
authors.forename: Seo Hyun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Physics, KAIST (Korea Advanced Institute of Science and Technology), Daejeon 305-701, South Korea.
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Kong
authors.affiliation: Laser and Optical Information Engineering, Cheongju University, Cheongju, Chungbuk 360-764, South Korea.
authors.forename: Jong Ung
authors.initials: JU
authors.lastname: Lee
authors.affiliation: Optical Engineering, Kongiu National University, Gongju, Chungnam 314-701, South Korea.
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Electrical Engineering, KAIST (Korea Advanced Institute of Science and Technology), Daejeon 305-701, South Korea.
authors.forename: Jai Hoon
authors.initials: JH
authors.lastname: Lee