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Image transfer properties of proximity focused image tubes
Applied Optics
|February 20, 2010
Summary
Experimental measurements show photoelectron radial spreading in image dissector tubes is lower than expected. This finding supports enhanced electron optical image transfer properties and high resolution capabilities for these devices.
Area of Science:
- Physics
- Electrical Engineering
- Materials Science
Background:
- Multialkali photocathodes are crucial components in image intensifier tubes.
- Understanding photoelectron emission characteristics is vital for optimizing image quality.
- Previous models predicted higher radial spreading than experimentally observed.
Purpose of the Study:
- To experimentally measure the lateral (radial) spreading of photoelectrons from a multialkali photocathode.
- To compare experimental results with theoretical predictions for electron optical image transfer.
- To determine the potential resolving power of proximity-focused image dissector tubes.
Main Methods:
- Experimental measurements of photoelectron radial emission energies.
- Analysis of electron energy distribution using a Maxwellian approximation.
- Evaluation of image transfer properties based on measured data.
Main Results:
- Photoelectron radial emission energy distribution is approximately Maxwellian.
- Measured radial emission energies are lower than predicted (approx. 1.4 eV below threshold).
- These findings are favorable for the electron optical image transfer properties of proximity-focused image tubes.
Conclusions:
- Commercially available tubes can resolve at least 40 line pairs/mm for white light.
- Resolving power increases to 60 lp/mm for wavelengths >600 nm.
- Resolving power decreases to 30 lp/mm for wavelengths <400 nm.
