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Chinese Journal of Lasers B

Polarization Spectral Hole-Burning in Organic Materials

Yu Yin, Zhao You-Yuan, Xiao Rong Luo, Lingbing Chen, Fuming Li

Published Jan 1, 1995• 0 citations
OpenAlex

Abstract

A model of polarization spectral hoel-burning was established through the density-matrix method. More than 300% anisotropic persistent spectral holes written in and readout in THP/PMMA and TMP/PMMA materials with high signal-to-ratio by CW linearly polarized light. The effect of probe angle and modulation field on the hole depth and shape wereinterpreted by using the model above.

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A model of polarization spectral hoel-burning was established through the density-matrix method. More than 300% anisotropic persistent spectral holes written in and readout in THP/PMMA and TMP/PMMA materials with high signal-to-ratio by CW linearly polarized light. The effect of probe angle and modulation field on the hole depth and shape wereinterpreted by using the model above.
Frequency-modulation polarization spectroscopy was used to detect persistent and anisotropic spectral holes written in the 607-nm color center in irradiated NaF and in the 683-nm absorption in phthalocyanine free-base-doped polyethylene. The high sensitivity of the technique permitted holes to be detected that had been written with exposure times down to 100 μsec. A general theory of frequency-modulation polarization spectroscopy is developed and specialized to the case of linear pump polarizations. Rate-equation models are presented to describe the anisotropic hole-burning process in a material, such as NaF, for which the absorbing centers have a finite distribution of possible orientations and in amorphous materials for which the distribution is uniform. The erasure of anisotropic holes because of excitation by the probe beam is investigated both theoretically and experimentally. A particular geometry was found to minimize this erasure effect in NaF.
We introduce a method of polarization spectroscopy into photon-gated persistent spectral hole burning, which results in considerable improvement in the signal-to-background ratio. Fifty multiple spectral holes burnt into meso-phenyl-tetrabenzoporphyrinato-zinc/aromatic cyanide/poly(methyl methacrylate) were clearly detected by this measurement technique. We developed a simplified model to account for the hole shapes. Background birefringence combined with refractive dispersion is thought to play a key role in the generation of asymmetric line shapes.
Persistent spectral hole burning (PSHB) was performed for several porphyrin molecules imbedded in polymer hosts and rare-earth ion Sm2+ doped in BaFCl0.5Br0.5 matrix. Power saturation and broadening effects for hole depth and width were observed. The dynamical process of hole formation was measured and explanation by population rate equations was given. Quantum efficiency of photochemical hole burning was investigated. For BaFCl0.5Br0.5:Sm2+ the capacity of data storage was estimated according to the result of multiple hole burning.
Photochemically instable dye molecules in low-temperature polymers are distributed not only spatially in the medium but also spectrally along the axis of resonant optical transition frequencies and orientationally with reference to the polarization of the transition. Consequently, such composite organic materials -- spectral hole burning media1-4 -- can be considered as novel optical materials possessing not only three-dimensional photosensitivity but also sensitivity to the wavelength and polarization of the incident light.