Improvement of UV on/off ratios of a gated ICCD by simultaneously gating the MCP

Stephen Hamilton; Emer Conroy

doi:10.1117/12.463950

27 August 2003 Improvement of UV on/off ratios of a gated ICCD by simultaneously gating the MCP

Stephen Hamilton, Emer Conroy

Proceedings Volume 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications; (2003) https://doi.org/10.1117/12.463950
Event: OPTO Ireland, 2002, Galway, Ireland

Abstract

Gated image intensifiers (Gen II) have been quoted in the past of having On/Off, or rejection ratios, of 107. In this paper we investigate the relationship of the On/Off ratio with incident wavelength. The data shows that the On/Off ratio can vary by as much as 102 with values of only 104 at ~200nm for a given image intensifier. This low On/Off ratio can limit the sensitivity of an Intensified CCD camera under certain conditions where there is an abundance of UV, such as spectral imaging in combustion research. This is particularly true in situations where the CCD exposure and readout times, typically milliseconds, take much longer than the required 'On' time of the photocathode, which is typically nanoseconds. Test data also shows the advantage of switching the MCP On and Off simultaneously with the photocathode, which brings the rejection ratios up to >108.

Citation Download Citation

Stephen Hamilton and Emer Conroy "Improvement of UV on/off ratios of a gated ICCD by simultaneously gating the MCP", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.463950

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