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Lund reports on atomic physics

An investigation of slow light and time delay-bandwitdth in Pr3+:Y2SiO5 by using the persistent spectral hole burning technique

Nan Lin

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

This master's thesis evaluates the performance of Pr 3+ :Y 2 SiO 5 in slow light by utilizing Persistent Spectral Hole Burning (PSHB), i.e. the extremely slow group velocity as well as the time delay-bandwidth product.A novel method that can be used to measure the high optical depth (αL) value is also tested in Pr 3+ :Y 2 SiO 5 .This Pr 3+ :Y 2 SiO 5 crystal has many brilliant properties for the slow light aspect, such as its high optical depth and the multipass design, which gives it the potential for obtaining a high time delay-bandwidth.Moreover, the spectral hole is created by spectral hole burning and do not need a strong coupling beam applied simultaneous with the probe beam, which avoids the obstruction to the weak signal.This thesis gives basic ideas for obtaining a slow group velocity of light and achieving a high time delay-bandwidth by applying PSHB.And the implements in Pr 3+ :Y 2 SiO 5 were done in the experiments.Some difficulties and suggestions for solution are discussed.The suggestion of the future work is also given. Conclusion and outlook 45

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Low Temperature Physics•Nov 1, 2006•1 citation
This master's thesis evaluates the performance of Pr 3+ :Y 2 SiO 5 in slow light by utilizing Persistent Spectral Hole Burning (PSHB), i.e. the extremely slow group velocity as well as the time delay-bandwidth product.A novel method that can be used to measure the high optical depth (αL) value is also tested in Pr 3+ :Y 2 SiO 5 .This Pr 3+ :Y 2 SiO 5 crystal has many brilliant properties for the slow light aspect, such as its high optical depth and the multipass design, which gives it the potential for obtaining a high time delay-bandwidth.Moreover, the spectral hole is created by spectral hole burning and do not need a strong coupling beam applied simultaneous with the probe beam, which avoids the obstruction to the weak signal.This thesis gives basic ideas for obtaining a slow group velocity of light and achieving a high time delay-bandwidth by applying PSHB.And the implements in Pr 3+ :Y 2 SiO 5 were done in the experiments.Some difficulties and suggestions for solution are discussed.The suggestion of the future work is also given. Conclusion and outlook 45
By using an Ar + ion laser, a tunable Rh 6 G dye laser (linewidth 0.5 cm −1 ) pumped by the second harmonic of a YAG:Nd laser and a Coherent 899-21 dye laser as light sources and using a monochromator, a phase-locking amplifier and a computer as the data detecting system, we detect the optical properties of Eu 3+ -doped Y 2 SiO 5 crystal. Persistent spectral hole burning (PSHB) are observed in the Eu 3+ ions spectral lines ( 5 D 0 − 7 F 0 transition) in the crystal at the temperature of 16 K. For 15 mW dye laser burning the crystal for 0.1 s spectral holes with hole width about 80 MHz both at 579.62 nm and at 579.82 nm are detected and the holes can remain for a long time, more than 10 h.
Recently, the interests in optical memory based on persistent spectral hole burning (PSHB) are increased because of its possibility of the application to high density optical memory. PSHB was observed for an organic dye doped in polymer and rear earth or transition metal doped in inorganic crystal or glasses up to now. Since PSHB was observed by two Russian groups (Gorokhovskii et al. and Kharlamov et al.) for free base phthalocyanine in a n-octane Shpol'skii matrix1 and for perylene and 9-aminoacridine molecules in glassy ethanol matrix2, PSHB materials are studied primarily for the polymer doped with an organic dye. But such materials can make hole only at very low temperature. Room temperature PSHB phenomena were observed on Sm2+ doped fluoride crystals3-5 and glasses6 recently, however these materials' Гih(inhomogeneous line width)/Гh(homogeneous line width)'s which are the parameters of data multiplicity in PSHB optical memory are an order of unity. For the application of PSHB materials to optical memory, high operating temperature, high Гih/Гh, and rapid reaction rate are wanted. Glass has a superiority on the view point of optical memory application because of its broad inhomogeneous line width and productivity. Our group has discovered room temperature PSHB for Sm2+ in borate glass systems whose Гih/Гh is 24.7 PSHB for rear earth metal in glass matrix has not been studied seriously, yet. It is thought that the study of the relationship between the optical hole and glass structure is necessary.
By using an Ar+ ion laser, a tunable Rh 6G dye laser(Linewidth : 0.5 cm(-1)) and a Coherent 899-21 dye laser as light sources and using a monochromator and a phase-locking amplifier, the optical properties of Eu3+ : Y2SiO5 crystal were detected. Persistent spectral hole burning (PSHB) were also observed in (5)Do-(7)Fo transition in the crystal at the temperature of 16 K. For 15 mW dye laser (Wavelength : 579.62 nm) burning the crystal for 0.1 s a spectral hole with about 80 MHz hole width were detected and the hole can been keep for longer than 10 h.
For next generation high density optical storage, extensive studies on persistent spectral hole burning (PSHB) have been performed, because they have a large potential for a high density frequency-domain optical data storage. PSHB has been observed at room temperature in Sm-doped crystals and glasses. Among them, glasses are considered to be more favorable than single crystals, due to their wide inhomogeneous line width and easy process for mass production. In the study, we developed a new glass mixture which shows room temperature PSHB with a inhomogeneous line width broadened up to 70 cm/sup -1/. The PSHB was characterized by investigating the time decay pattern of fluorescence and the excitation spectra.
We report ultraslow group velocities of light in a solid. Light speeds as slow as 45 m/s were observed, corresponding to a group delay of 66 microsecond(s) in a 3-mm thick, optically dense crystal of Pr doped Y2SiO5. Reduction of the group velocity is accomplished by using a sharp spectral feature in absorption and dispersion that is produced by resonance Raman excitation of a ground-state spin coherence. Potential applications of slow and stopped light for the highly efficient storage and recall of optical data are discussed.
The persistent spectral hole-burning (PSHB) phenomenon has been known since 1974. It is still an important research area for the study of the intimacy of complex molecular systems in the solid state, revealing high-resolution spectra, photophysics, photochemistry, and dynamics of molecular doped amorphous media, organic as well as inorganic. From another point of view, PSHB allows the engraving of any spectral structures in the inhomogeneous absorption band profile of molecular doped amorphous hosts or ion doped crystals cooled down to liquid helium temperatures. Therefore, a PSHB material is programmable in the spectral domain and consequently it can be transformed in an optical processor capable of achieving user-defined optical functions. Some aspects of both fields are illustrated in the present paper. Concerning the search for efficient PSHB materials, the hole-burning performances and the photophysics of polymer and xerogel based systems are compared. The problem of high-temperature persistent spectral hole-burning materials and the search for new frequency selective photosensitive systems for fast optical pulse processing at 800nm are considered. Regarding the points treated, inorganic hosts based on silicate xerogels or porous glasses have shown the best results. Moreover, by combining inorganic and organic capabilities or by grafting organic species to the host, hybrid xerogels have not yet revealed all possibilities. Also, the interest of two-photon materials for engraving spectral features with near-infrared or infrared light is developed. As an introduction to possible applications of PSHB material, the basics of spectro-temporal holography are remembered and a demonstrative experiment using a naphthalocyanine-doped polymer film is described, proving that the temporal aberration free recompression of ultrashort light pulses is feasible, therefore opening a way for applications in ultrashort light pulse shaping. Aspects for a comparison between cw hole-burning and femtosecond spectro-temporal experiments are considered, and prospects for coherent control of light fields or photochemical processes are also evoked.