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Real-time recording medium: photodichroic KF:LiF.

W C Collins, M O Greer

    Applied Optics
    |March 4, 2010
    PubMed
    Summary

    Photodichroic potassium lithium fluoride (KF:LiF) crystals show promise for optical spectrum analyzers. These photosensitive crystals offer cost-effective, large-scale production and efficient laser recording capabilities.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Photodichroic crystals are emerging as advanced optical materials.
    • Potassium lithium fluoride (KF:LiF) exhibits significant photosensitivity.
    • Optical spectrum analyzers require efficient input transducers and adaptive spatial filters.

    Purpose of the Study:

    • To evaluate the potential of KF:LiF crystals as input transducers and adaptive spatial filters.
    • To characterize the laser recording and readout properties of KF:LiF crystals.
    • To assess the performance of KF:LiF in optical spectrum analyzer applications.

    Main Methods:

    • Laser recording and readout experiments using a high-precision laser scanner (96.6-MHz, sub-nanosecond pulses at 514 nm).
    • Measurement of material sensitivity, modulation transfer function (MTF), and linear dynamic range.

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  • Evaluation of readout characteristics at different wavelengths (514 nm and 488 nm).

    • Main Results:

    • Adequate recording achieved with exposures < 10 mJ/cm(2).
    • Measured MTF of 40% at 72 lines/mm with uniform readout.
    • Destructive readout at 514 nm, but reduced decay rate at 488 nm.
    • Linear dynamic range of 40 dB in the Fourier plane.

    Conclusions:

    • KF:LiF crystals demonstrate significant potential for optical spectrum analyzer applications.
    • The material offers a balance of high photosensitivity, cost-effectiveness, and operational near room temperature.
    • Further optimization of readout strategies can enhance signal recovery and device performance.