Ultrafast carrier and grating lifetimes in semiconductor-doped glasses

Yao, S. S.; Karaguleff, C.; Gabel, A.; Fortenberry, R. M.; Seaton, C. T.; Stegeman, George I.

doi:10.1063/1.95887

Cited by 218 publications

(29 citation statements)

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“…Yao et al 1) and Tomita et al 2) observed fast response; however, we did not. This may be due to the detrapping effect and the low time resolution of the experimental apparatus.…”

contrasting

confidence: 53%

“…This may be due to the detrapping effect and the low time resolution of the experimental apparatus. The extremely fast response reported by Yao et al 1) is probably due to a photodarkening effect. 4) In summary, time-resolved luminescence spectra of CdS-doped glass are reported.…”

mentioning

confidence: 82%

“…For example, Yao et al 1) reported fast response time (less than 16 ps), and Tomita et al 2) reported a fast (440 ps) and slow (more than 2 s) response time in CdSSe-doped glasses. We report on measurements of luminescence decay time of CdS-doped glass to investigate the origin of these differences.…”

mentioning

confidence: 99%

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Transient Characteristics of Luminescence from CdS-Doped Glass

Miyoshi

1992

Jpn. J. Appl. Phys.

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“…Yao et al 1) and Tomita et al 2) observed fast response; however, we did not. This may be due to the detrapping effect and the low time resolution of the experimental apparatus.…”

contrasting

confidence: 53%

mentioning

confidence: 82%

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Transient Characteristics of Luminescence from CdS-Doped Glass

Miyoshi

1992

Jpn. J. Appl. Phys.

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“…It is perhaps the simplest generalization of the ubiquitous Kerr law and models a material whose refractive index depends on the optical field amplitude raised to a power other than 2. Various semiconductors, for example InSb [19] and GaAs/GaAlAs [20], doped filter glasses (such as CdS x Se 1-x ) [21], and liquid crystals (such as MBBA) [18], can possess power-law behaviour in their refractive index. Power-law solitary waves have been investigated theoretically in the context of interface surface modes [22], and as elementary excitations in thin films [23] and slab waveguides [24].…”

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confidence: 99%

Helmholtz solitons in power-law optical materials

et al. 2007

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“…1). With all three input pulses coincident on than 16 p, ilaser pulse width limitedi, the sample, a reflection efficiency of 1% at f1 MW/cm 2 The photoluminescence measurements were made uspump power was observed. This signal level is slightly lower ing a mode-locked train of pulses of 30-ps duration and 50-than that previously reported in Ref.…”

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confidence: 99%

Signal Processing with Degenerate Four-Wave Mixing.

Stegeman¹,

Seaton²

1987

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large nonlinear index of refraction (n 2 -10-4 m 2 /w with fast response times (r < 16 psec) required for high speed optical signal processing.Of the number of processing techniques which exist for producing optical waveguides from glass based materials, ion-exchange is one of the most flexible and l easiest to implement.We have now established a very successful potassium (K+)/sodium (Na + ) ion-exchange technique' for producing low-loss (few dB/cm) eplanar waveguides. This process is also amenable to producing channel waveguide structures and devices which we are also undertaking. Dr Lee-Giles. 202-767-4933Electronic Material -2-We are currently assessing these semiconductor-doped glass waveguides for application to this waveguide DFWM program. One area of concern is the effect of the ion-exchange process on the nonlinear response of the material since we are not achieving the expected rey.onse from waveguide samples which, previous to processing, were showing large DFWM signals in bulk form. Whilst working on this problem we are also developing waveguides utilizing the semiconductor-doped glass as the nonlinear substrate material. These are produced by RF sputtering of a higher index glass film onto the nonlinear substrate to produce the waveguide. Very lowloss waveguides have been produced by sputtering of PSK-2 glass onto the prepolished color-filters and experiments are in progress to attempt waveguide DFWM in this similar geometry to the CS 2 case but with a higher nonlinearity medium surrounding the guiding layer.The other major avenue of research pertaining to this program is the use of nonlinear organic materials for waveguide optical signal processing applications. A number of reports of large and fast responding nonlinearities have been made recently and we are currently testing materials of this form from the Celanese Corporation. We spin thin films of company propriotory organic materials onto fused silica and glass substrates and have achieved relatively low-loss guiding (-ldB/cm). The coupling process is achieved by using physical relief gratings on the substrate since prism coupling can seriously damage such mechanically soft films.Other sources of nonlinear organic materials are also being pursued (SUNY Buffalo; JPL) and the possibility of producing nonlinear organic films by deposition in our Langmuir-Blodgett tank is still in our plans. We have succeeded'in producing Degenerate four-wave mixing in a thin-film waveguide is demonstrated for the first time. A reflectivity of 10-at a power density of 5 MW/cm 2 was obtained for liquid CS 2 placed on top of a glass waveguide.Degenerate four-wave mixing (DFWM) is a phenoum over the part of the waveguide where the beams intersect. menon of considerable interest because of its applications toThe liquid was held in place by a hollowed out glass cell optical signal processing.' Nonlinear signal delay lines,' whose bottom surface was well polished and optically contime reversal of optical pulses, 2 optical computing, 3 bistabitacted to the thin-film surfa...

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Ultrafast carrier and grating lifetimes in semiconductor-doped glasses

Cited by 218 publications

References 1 publication

Transient Characteristics of Luminescence from CdS-Doped Glass

Transient Characteristics of Luminescence from CdS-Doped Glass

Helmholtz solitons in power-law optical materials

Signal Processing with Degenerate Four-Wave Mixing.

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