The optical design of the apparatus for generation of programmable-spectrum light is proposed. Both wide-band (hundreds of nanometer) and narrow-band (units of nanometer) spectral patterns may be generated by means of the proposed device. The spectral pattern is generated by micromirror array spatial sampling of incoming wide-band light beam, that gives needed spectral components after passing the dispersion system. The designed prototype of the apparatus was tested experimentally.
We have designed and built a multi-object spectrometer with micromirror array as a reconfigurable entrance aperture. In interactive mode, the instrument makes it possible to record both the hyperspectrum of the studied region as a whole and also sets of spectra of arbitrarily specified fragments. In this case, a spectral resolution of 0.8 nm or better is provided in the subranges 400–670 nm and 650–900 nm, aperture ratio of the spectroscopic channel at least 1:5. The analytical characteristics of the instrument make it possible to use it to solve a broad range of problems in modern multi-object spectroscopy and hyperspectroscopy.
Schemes of high-aperture and compact optical spectrometers and giperspectrometer with minimized aberrations are presented. In the first scheme usage of inclined plane-parallel plate allows decreasing of astigmatism. In the second scheme off-axis aberrations are practically removed due to axial propagation of light. For giperspectrometer narrowing of light propagation angle through the object lens and turning the light out of dispersion plane lead to minimizing of picture aberrations.
Предложены схемы светосильных компактных спектрометров и гиперспектрометра с минимизированными аберрациями. В первой схеме за счет использования наклонной плоскопараллельной пластинки уменьшен астигматизм. Во второй благодаря осевому прохождению светового пучка внеосевые аберрации практически устранены. В схеме гиперспектрометра аберрационные искажения изображения минимизированы за счет уменьшения углов прохождения светового пучка через объективы и вывода его из плоскости дисперсии.
Schemes of high-aperture and compact optical spectrometers and giperspectrometer with minimized aberrations are presented. In the first scheme usage of inclined plane-parallel plate allows decreasing of astigmatism. In the second scheme off-axis aberrations are practically removed due to axial propagation of light. For giperspectrometer narrowing of light propagation angle through the object lens and turning the light out of dispersion plane lead to minimizing of picture aberrations.
We have numerically modeled astigmatism correction for a large-aperture mirror spectrometer using a tilted plane-parallel plate. The results suggest a decrease in the height of the astigmatic focal spot by a factor of 2–7 over the entire image field without reducing the spectral resolution. We have demonstrated experimentally that the described correction method is feasible on a prototype of a spectrometer. Based on the numerical modeling and experimental data, we have shown that practical application of the method is feasible in order to substantially improve the sensitivity of spectral instruments.
