1988 Fiscal Year Final Research Report Summary
Generation of Phase-Conjugate Waves in Saturable Dye-Doped Films and Transient Properties of Phase-Conjugated Waves
| Project/Area Number |
62550021
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理計測・光学
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
FUJIWARA Hirofumi Muroran Institute of Technology, Faculty of Engineering Professor, 工学部, 教授 (80001303)
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| Co-Investigator(Kenkyū-buntansha) |
MIYANAGA Shigeki Muroran Institute of Technology, Faculty of Engineering Assistant, 工学部, 助手 (70182037)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Phase conjugate waves / Organic dyes / Degenerate four-wave mixing / 位相共役干渉法 |
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| Research Abstract |
There has been some interest in optical phase conjugation with dye-doped ransparent polymer films. Some of xanthene and azo dyes have strong absorption at wavelengths of an argon-ion laser and also relatively long life times of their excited states, which make it possible to generate cw phase-conjugate waves at low intensities less than 0.5w/cm^2.
Thick(10-100 m) and thin (<10 m) dye-doped polymer films were prepared by dip and spin-coating methods, respectively.
Main mechanisms to produce phase-conjugate waves are due to the grating formation of (1) population by saturable absorption by dyes, (2) photo-induced orientation of dyes and (3) irreversible photo-induced chemical changes.
As each grating has a different decay time, it can be separately observed by turning off a probe beam in a degenerate four-wave mixing configuration: In general, decay times of phase-conjugate waves increase in the order of magnitude.(1).(2)and(3).
Dominant mechanisms of generation of phase-conjugate waves are (1) and (3) for xanthene-dye-doped films and (2) and (3) for azo-dye-doped films. However. whether (3) contributes to generation of phase conjugate waves or not, depends upon the combination of dyes and matrices. For example, (3) contributes to it in methylred-doped PMMA films but not in methylred-doped galatin films. It is very intersting that the intensity of phase conjugate wave by azo dyes are by about 20 times in the case of perpendicular polarization bet-ween pump and probe waves larger than in the case of parallel porarization.
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Research Products
(12 results)
