Construction method through multiple off-axis parabolic surfaces expansion and mixing to design an easy-aligned freeform spectrometer
| Autor: | Qun Yuan, Ningyan Xu, Xin Cao, Jingfei Ye, Zhishan Gao, Lu Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Spectrometer business.industry Bandwidth (signal processing) Physics::Optics Curved mirror 02 engineering and technology Grating 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Collimated light 010309 optics Optics Optical path Construction method 0103 physical sciences Spectral resolution 0210 nano-technology business |
| Zdroj: | Optics Express. 27:25994 |
| ISSN: | 1094-4087 |
| Popis: | The classic Czerny-Turner spectrometer consists of a plane grating and two spherical mirrors. The optical path geometry adopted for incident and grating dispersed light is off-axis reflection, so the spherical collimating and focusing mirrors introduce coma and astigmatism. The conventional configuration is asymmetrical for coma automatic compensation, but suffers from astigmatism. We substitute the off-axis parabolic (OAP) surfaces for spherical surfaces of the collimating mirror and each sub-region of the focusing mirror, to achieve an aberration free configuration. The multiple OAP surfaces are then expanded and mixed, to construct a freeform surface integrating the collimating and focusing mirrors into a single element. Results show that a 0.1 nm spectral resolution is achieved over a bandwidth of 400 nm centered at 800 nm, in the designed spectrometer comprised of a plane grating and one freeform mirror. The construction method is advantageous to integrated optic design, and the resulting freeform mirror spectrometer is compact, and simplifies manufacture and alignment. |
| Databáze: | OpenAIRE |
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