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Nonlinear Optics

Demonstration of accumulated photon echoes by using synchrotron radiation

Hiroshi Itoh, Shunsuke Nakanishi, M. Kawase, Hitoshi Fukuda, Hiroki Nakatsuka, Masao Kamada

Published Dec 17, 2002• 0 citations
Publisher

Abstract

Synchrotron radiation (SR) can be applied as an excitation source of the accumulated photon echoes. The accumulated photon echoes of sulforhodamine 640 ( SRh 640) doped in polyvinyl alcohol film (PVA) was successfully observed by exciting the sample with the SR and employing the phase modulation method. When we used SR passed through a bandpass filter with bandwidth of about 13 nm, the photon echo decay curve was obtained with a time resolution of 133 fs. In addition, when the bandpass filter was removed, the field autocorrelation time of the SR beam decreased to about 3 fs.>

DOI
10.1109/nlo.1994.470780

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Synchrotron radiation (SR) can be applied as an excitation source of the accumulated photon echoes. The accumulated photon echoes of sulforhodamine 640 ( SRh 640) doped in polyvinyl alcohol film (PVA) was successfully observed by exciting the sample with the SR and employing the phase modulation method. When we used SR passed through a bandpass filter with bandwidth of about 13 nm, the photon echo decay curve was obtained with a time resolution of 133 fs. In addition, when the bandpass filter was removed, the field autocorrelation time of the SR beam decreased to about 3 fs.>
We demonstrate that accumulated photon echoes can be generated by synchrotron radiation. This is an experiment of a nonlinear optical effect carried out by using the radiation from an electron storage ring. A dye-doped polymer film was excited by the visible light from the storage ring, and the accumulated photon echoes from the sample were observed by employing a phase-modulation technique. The use of synchrotron radiation facilitates the extension of the spectral range where we can observe photon echoes with ultrahigh time resolution.
The stimulated photon echo memory using persistent hole-burning materials has been attracting much attention as a possible candidate for high-density data storage. Most studies have been related to the writing and reading processes and little attention has been paid for a partial erasing. We demonstrate for the first time that partial erasing of photon echo memory can be accomplished by simply employing a half-wave plate. In a photon echo memory, the write and data pulses with a time separation /spl tau/ excite a hole-burning material. These pulses create a periodic absorption modulation (periodic hole) with a frequency of l//spl tau/ in the absorption spectrum. When the read pulse excites the sample, a stimulated echo pulse is emitted at /spl tau/ after the read pulse, We note that a bit of data is stored as a periodic hole in the sample. A rotation of a half-wave plate inserted in the data pulse path (which induce a retardation of /spl lambda//2) creates two periodic holes that have the same frequency and opposite phase. Therefore, erasing a periodic hole can be done by rotating the wave plate. A dye (Sulforhodamin 640) doped polymer film (polyvinyl alcohol) cooled at 2 K was used as a persistent hole-burning material.
We used a Michelson-type interferometer to observe the waveform of the accumulated photon echoes in a 3,3′-diethylthiatricarbocyanine iodide–doped poly(vinyl alcohol) film. By Fourier analysis of the measured interferograms we obtained the shapes of the burned population grating and the phase grating in the sample. From the frequency distribution of the dye molecules, that is efficient for persistent spectral hole burning, we estimated the inhomogeneous frequency distribution of the 0–0 transition from S0 to S1 levels of the dye molecules in the poly(vinyl alcohol) film.
Using a superluminescent diode, we observed femtosecond accumulated photon echoes in 1, 1′-diethyl-4, 4′-quinodicarbocyanine iodide embedded in polyvinyl acetate. The output of the superluminescent diode directly excited the sample to produce photon echoes. By using a simple experimental system we obtained a temporal resolution as high as 100 fsec. This resolution is determined by the spectral width of the superluminescent diode and the noncollinear excitation beam configuration of the system.
Accumulated photon echoes have been observed by use of a light-emitting diode. This is to our knowledge the first observation of photon echoes that are excited by a nonlaser light source. In the incoherent-light photon echo, the time resolution is equal to the inverse of the overall spectral width of the excitation light. Therefore we can easily get a high time resolution by using nonlaser light with a broad spectrum. Moreover the use of nonlaser light in the photon-echo experiment will extend the technique into wavelength regions where lasers are not currently available.