Mr. Lifeng Tang Profile

Lifeng Tang

at NIAOT, CAS

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Proceedings Article | 8 March 2023 Poster + Paper

Camera optics in the ultraviolet region of the Next Generation Palomar Spectrograph

Lifeng Tang, Zhongwen Hu, Hangxin Ji

Proceedings Volume 12428, 1242816 (2023) https://doi.org/10.1117/12.2657248

KEYWORDS: Cameras, Image quality, Liquid lenses, Spectrographs, Ultraviolet lenses, Optical design

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The Next Generation Palomar Spectrograph (NGPS) is a high-throughput medium-resolution broadband spectrograph developed for the Hale telescope. It consists of four spectroscopic channels, where ultraviolet channel covers the region [310-436] nm and delivers a resolving power about 4000 with 0.5 arcsec focal plane sampling at the center wavelength 370 nm. The spectrometer operates in the dome under wide temperature range from -10 degrees to 30 degrees, and temperature variation is around 3 degrees per night. One of the goals of NGPS is to achieve excellent image quality and extremely high stability over a wide temperature range. It is indeed a challenge due to limited selection of optical materials in the ultraviolet waveband. This article introduces different camera concept for the ultraviolet channel of NGPS. The Schmidt reflective camera was finally adopted after evaluation of their performance.

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