Abstract
A thermographic phosphor screen caused to fluoresce by continuous ultraviolet excitation is impinged by an infrared laser beam which locally heats the phosphor to quench its fluroescence and thereby form an image of the beam as a dark pattern on the screen. Provision is made to vary the thermal bias on the screen over a range of phosphor temperatures commensurate with maximum optical resolution and sensitivity thru a wide range of impinging laser beam powers.
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