Actas de congresos
Progress On Holographic Techniques To Measure Real-time Phase And Amplitude Gratings In Photosensitive Materials
Registro en:
Journal Of Optics A: Pure And Applied Optics. , v. 5, n. 5, p. S170 - S174, 2003.
14644258
10.1088/1464-4258/5/5/360
2-s2.0-0141645528
Autor
Cordeiro C.M.B.
Freschi A.A.
Cescato L.
Institución
Resumen
In this paper we present and demonstrate a technique that allows simultaneous and independent measurement of small changes in the refractive index and the absorption coefficient produced in photosensitive materials during holographic exposure. The technique is based on the synchronous detection of two-wave mixing signals in both directions of the transmitted interfering beams. By processing both signals it is possible to separate the diffraction contributions of the refractive index from the absorption coefficient and simultaneously stabilize the incident fringe pattern. The demonstration of this technique is undertaken by following the temporal evolution of the phase and amplitude modulations in photoresist films. To check the ability of the technique to perform numeric evaluations, for a positive photoresist the changes in the optical constants were measured and compared with those obtained using independent methods. 5 5 S170 S174 Sillescu, H., Ehlich, D., Application of holographic grating techniques to the study of the diffusion processes in polymers (1989) Lasers in Polymers Science and Technology Applications, 3, pp. 211-225. , ed J P Fouassier and F F Rabek (Boca Raton, FL: Chemical Rubber Company Press) ch 7 Brauche, C., Anneser, H., Holographic spectroscopy and holographic information recording in polymer matrices (1989) Lasers in Polymer Science and Technology Applications, 3, pp. 1181-1208. , ed J P Fouassier and F F Rabek (Boca Raton, FL: Chemical Rubber Company Press) ch 6 Eichler, H.J., Günter, P., Pohl, D.W., (1986) Laser Induced Dynamic Gratings, 50, pp. 13-93. , ed T Tamir (Berlin: Springer) Cescato, L., Frejlich, J., (2002) Self Stabilized Real Time Holographic Recording in Three-Dimensional Holographic Imaging, pp. 21-46. , ed C J Kuo and M H Tsai (New York: Wiley) Pinsl, J., Gehrtz, M., Brauchle, C., (1986) J. Phys. Chem., 90, p. 6754 Gehrtz, M., Pinsl, J., Brauchle, C., (1987) Appl. Phys. B, 43, pp. 61-77 Cescato, L., Mendes, G.F., Frejlich, J., (1987) Opt. Lett., 12, p. 882 Frejlich, J., Kamshilin, A.A., Garcia, P.M., (1992) Opt. Lett., 17, pp. 249-251 Kogelnik, H., (1969) Bell Syst. Tech. J., 48, pp. 2909-2947 Cescato, L., Mendes, G.F., Frejlich, J., (1987) Opt. Lett., 12, p. 882 Dill, F.H., (1975) IEEE Trans. Electron Devices, 22, pp. 445-452 Colburn, W.S., Haines, K., (1971) Appl. Opt., 10, pp. 1636-1641 Heavens, O.S., (1991) Optical Properties of Thin Solid Films, p. 130. , Toronto: Dove