Real Time Recording Medium: Photodichroic KF: LiF

William C. Collins; Milton O. Greer

doi:10.1117/12.955805

13 December 1977 Real Time Recording Medium: Photodichroic KF: LiF

William C. Collins, Milton O. Greer

Proceedings Volume 0123, Optical Storage Materials and Methods; (1977) https://doi.org/10.1117/12.955805
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

Laser recording and readout measurements using the photodichroic crystal KF:LiF indicate that the material has potential as an input transducer and an adaptive spatial filter in an optical spectrum analyzer, These crystals are among the most photosensitive recording materials without gain, can be produced in large sizes at relatively low cost, and can be operated close to room temperature using thermoelectric coolers. Experiments using a high precision laser scanner providing 96.6 MHz subnanosecond pulses at 514 nm show that adequate recording can be accomplished with exposures less than 10 mJ/cm². An MTF of 40% at 72 ℓ/mm was measured with uniform readout illumination of the recorded signal, but this is reduced if the signal is recovered by rescanning due to the convolution of the scanning beam profile with the recorded spot profile. The readout is destructive at the recording wavelength but can be readout with a much reduced decay rate by using 488 nm. The linear dynamic range in the Fourier plane was measured to be 40 dB.

Citation Download Citation

William C. Collins and Milton O. Greer "Real Time Recording Medium: Photodichroic KF: LiF", Proc. SPIE 0123, Optical Storage Materials and Methods, (13 December 1977); https://doi.org/10.1117/12.955805

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