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Japanese Journal of Applied Physics

High-Frequency Heterodyned Detection of Picosecond Accumulated Photon Echoes

S. Saikan, Atsushi Fujiwara, Takashi Kushida, Y. Kato

Published Jun 1, 1987• 14 citations
Publisher

Abstract

Highly sensitive detection of accumulated photon echoes was achieved by means of a high-frequency heterodyned method using a mode-locked CW dye laser. Experimental results on the modulation frequency dependence of the echo signal strength and also the excitation wavelength dependence of the echo decay curves in Nd:silicate glass are presented.

DOI
10.1143/jjap.26.l941

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Optics Letters•Feb 1, 1983•66 citations
Highly sensitive detection of accumulated photon echoes was achieved by means of a high-frequency heterodyned method using a mode-locked CW dye laser. Experimental results on the modulation frequency dependence of the echo signal strength and also the excitation wavelength dependence of the echo decay curves in Nd:silicate glass are presented.
Since the first observation of accumulated photon echoes by Hesslink and Wiersna [1], nearly transform-limited mode-locked pulse trains have been used as the excitation source, and the resolution times have been limited by the widths of the pulses. In this paper we show theoretically and experimentally that the time resolution of the accumulated photon echoes is determine not by the pulse width but by the correlation time of the excitation field [2]. This indicates that it is possible to obtain a sub-picosecond resolution in accumulated photon echoes Sven by using a cw laser (non-mode-locked), if the laser output has a sufficiently broad and smooth spectrum.
Accumulated photon echoes were observed in Nd3+{\mathrm{Nd}}^{3+}Nd3+-doped silicate glass by using coherent and incoherent light, and it was theoretically and experimentally verified that the time resolution is determined not by the pulse width but by the correlation time of the excitation field. Even by using a cw laser, instead of a mode-locked laser, a subpicosecond time resolution was obtained when it was operated with a broad and smooth spectrum. The broadest output spectrum, and hence the highest time resolution, was attained when the dye laser was pumped by a mode-locked Ar+{\mathrm{Ar}}^{+}Ar+ laser, and their cavity lengths were mismatched by a few \ensuremath{\mu}m. In an experiment with a resolution time of 220 fsec, a new very fast decay was observed in the echo decay curve besides a slower decay already reported.
The time resolution of a heterodyne-detected accumulated photon echo has been improved significantly by using a dye laser whose lasing frequency is repetitively scanned. A time resolution of less than 30 fsec was obtained, even with a non-mode-locked cw dye laser. This technique is applicable provided that the absorption recovery time of the sample is longer than the repetition period of the frequency-scanning dye laser. The absorption recovery times of several dyes that were doped with polyvinyl alcohol have also been measured.