In order to characterize the spectral response of transmission-mode alkali telluride photocathodes, a spectral response measurement system for image intensifiers working from the vacuum-ultraviolet to ultraviolet band is developed. Using this system, the transmittance curves of usual window materials such as quartz, MgF2, and sapphire selected to prepare alkali telluride photocathodes are measured. In addition to the transmittance test function, the spectral response of image intensifiers based on transmission-mode alkali telluride photocathodes, such as Cs2Te, Rb2Te, Cs-K-Te, and Rb-K-Te photocathodes, under the excitation light from 115 to 400 nm is measured. The measured results show that the longwave cutoff wavelength of the Rb2Te photocathode is 313 nm, while that of the Cs2Te photocathode is 342 nm, which could be ascribed to the reduced cathode work function, inversely proportional to the atomic number of the alkali element in uni-alkali telluride photocathodes. Besides, the spectral response values of Cs-K-Te and Rb-K-Te photocathodes are greater than those of Cs2Te and Rb2Te photocathodes, and this case is similar to the multialkali effect of alkali antimonide photocathodes. The cutoff wavelength can get shorter through the combination with an additional K element. Compared with the Rb-K-Te photocathode with the shorter cutoff wavelength, the Cs-K-Te photocathode can achieve higher sensitivity.
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November 2017
Research Article|
October 03 2017
Spectral response characteristics of transmission-mode alkali telluride photocathodes working from vacuum-ultraviolet to ultraviolet band Available to Purchase
Xiang Zhang;
Xiang Zhang
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Yijun Zhang;
Yijun Zhang
a)
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Yunsheng Qian;
Yunsheng Qian
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Cheng Feng;
Cheng Feng
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Jingzhi Zhang;
Jingzhi Zhang
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Yunlong Jiang;
Yunlong Jiang
North Night Vision Technology Co. Ltd
, Kunming 650114, China
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Zhiyun Pan
Zhiyun Pan
North Night Vision Technology Co. Ltd
, Kunming 650114, China
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Xiang Zhang
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Yijun Zhang
a)
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Yunsheng Qian
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Cheng Feng
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Jingzhi Zhang
School of Electronic and Optical Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Yunlong Jiang
North Night Vision Technology Co. Ltd
, Kunming 650114, China
Zhiyun Pan
North Night Vision Technology Co. Ltd
, Kunming 650114, China
a)
Electronic mail: [email protected]
J. Vac. Sci. Technol. B 35, 061202 (2017)
Article history
Received:
May 16 2017
Accepted:
September 21 2017
Citation
Xiang Zhang, Yijun Zhang, Yunsheng Qian, Cheng Feng, Jingzhi Zhang, Yunlong Jiang, Zhiyun Pan; Spectral response characteristics of transmission-mode alkali telluride photocathodes working from vacuum-ultraviolet to ultraviolet band. J. Vac. Sci. Technol. B 1 November 2017; 35 (6): 061202. https://doi.org/10.1116/1.5006049
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