Comparison and research of spectral response characteristic of transmission-mode GaAs photocathode before and after indium seal

Yujie Du; Yanjun Ji; Xiaoqing Du

doi:10.1117/12.758269

29 November 2007 Comparison and research of spectral response characteristic of transmission-mode GaAs photocathode before and after indium seal

Yujie Du, Yanjun Ji, Xiaoqing Du

Author Affiliations +

Proceedings Volume 6833, Electronic Imaging and Multimedia Technology V; 683331 (2007) https://doi.org/10.1117/12.758269
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Based on the research of the standard second generation, the high capability third generation, the exceeding third generation and the fourth generation, the spectral response of the third generation LLL was carried out using a self-developing spectral response measurement instrument. Spectral response characteristics of third-generation LLL tube were obtained, and the material performance parameters of GaAs photocathode were calculated by curve simulation method. On-line measurement of GaAs photocathode after high-temperature activation and low-temperature activation was carried out, the results showed that spectral response in the whole response waveband decreased after indium seal, and long wave responsibility was most obviously influenced. Decrease was large, cut-off wavelength and peak value wavelength move towards short-wave, peak response value and integral sensitivity decreased, and the final spectral response curve became flat. By calculating photocathode parameters, it was found that indium seal, lead to the variations of surface activation layers of photocathode, and the long wave responded and sensitivity decreased accordingly. The influence factors on the surface activation layers during indium seal were also analyzed.

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Yujie Du, Yanjun Ji, and Xiaoqing Du "Comparison and research of spectral response characteristic of transmission-mode GaAs photocathode before and after indium seal", Proc. SPIE 6833, Electronic Imaging and Multimedia Technology V, 683331 (29 November 2007); https://doi.org/10.1117/12.758269

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