We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Compact Numerical Aperture 0.5 Fiber Optic Spectrometer Design Using Active Image Plane Tilt.
- Authors
Yue, Pinliang; Yang, Mingyu; Jiao, Qingbin; Xu, Liang; Wang, Xiaoxu; Zhang, Mingle; Tan, Xin
- Abstract
The numerical aperture of the spectrometer is crucial for weak signal detection. The transmission lens-based configuration has more optimization variations, and the grating can work approximately in the Littrow condition; thus, it is easier to acquire high numerical aperture (NA). However, designing a large aperture focusing lens remains challenging, and thus, ultra-high NA spectrometers are still difficult to acquire. In this paper, we propose a method of setting image plane tilt ahead directly when designing the large aperture focusing lens to simplify the high NA spectrometer design. By analyzing the accurate demands of the focusing lens, it can be concluded that a focusing lens with image plane tilt has much weaker demand for achromatism, and other monochromatic aberration can also be reduced, which is helpful to increase the NA. An NA0.5 fiber optic spectrometer design is given to demonstrate the proposed method. The design results show that the NA can achieve 0.5 using four lenses of two materials, and the MTF is higher than 0.5 when the spectral dispersion length is 12.5 mm and the pixel size is 25 μm, and thus, the spectral resolution can achieve 6.5 nm when the spectral sampling ratio is 2:1. The proposed method can provide reference for applications when appropriate materials are limited and high sensitivity is necessary.
- Subjects
NUMERICAL apertures; SPECTROMETERS; ACHROMATISM; SIGNAL detection; FIBERS; LENSES
- Publication
Sensors (14248220), 2024, Vol 24, Issue 12, p3883
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s24123883