Use of real-time latent images to write long holographic diffraction gratings in photoresist

Bruce R. Napier; Nicholas J. Phillips

doi:10.1117/12.271351

10 April 1997 Use of real-time latent images to write long holographic diffraction gratings in photoresist

Bruce R. Napier, Nicholas J. Phillips

Proceedings Volume 3011, Practical Holography XI and Holographic Materials III; (1997) https://doi.org/10.1117/12.271351
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

It is well known that photoresist undergoes a chemical change on exposure which results in a variation in its refractive index. In the recording of diffraction gratings this index change leads to a detectable phase grating before development: the so called latent image. The growth of the grating may be observed in real time by monitoring the diffraction efficiency of the first order beam from this latent image. By superposing the diffracted beams from two such latent gratings a moire pattern may be observed, from which the position of the fringes of one grating relative to the other may be obtained. If one of the gratings is moved relative to the other then this pattern may be used as the trigger for an optical exposure, and gratings may be written to cover a length independent of the size of the exposing beams.

Citation Download Citation

Bruce R. Napier and Nicholas J. Phillips "Use of real-time latent images to write long holographic diffraction gratings in photoresist", Proc. SPIE 3011, Practical Holography XI and Holographic Materials III, (10 April 1997); https://doi.org/10.1117/12.271351

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