dorsal/arxiv
View SchemaPulse compression by parametric beating with a prepared Raman coherence
| Authors | Fam Le Kien, K. Hakuta, A. V. Sokolov |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0207091 |
| URL | https://arxiv.org/abs/quant-ph/0207091 |
Abstract
We present a general analysis for the interaction of a probe laser radiation with a coherently prepared molecular Raman medium. We describe a general formalism which includes dispersive effects, such as group velocity and group velocity dispersion (GVD). When dispersion is negligible, the analysis is especially simple and insightful. We show that molecular oscillations result in a modulated instantaneous susceptibility of the medium. The effect of the time-varying susceptibility on a probe laser pulse is two-fold: the output frequency becomes modulated because of the time-varying phase velocity, and the pulse shape becomes deformed because of the time-varying group velocity. We identify two mechanisms for pulse compression: (1) Frequency chirping with subsequent pulse compression by normal linear GVD (possibly in the same medium) and (2) Compression due to the time-varying group velocity. We analyze various aspects of pulse compression in the coherent Raman medium and derive conservation relations for this process. When we consider a probe laser pulse which is much shorter than the molecular oscillation period, we observe frequency chirping, compression, or stretching of this pulse, depending on its relative timing with respect to the molecular oscillations. Based on our analysis, we propose a method for selective compression or frequency conversion of single ultrashort pulses.
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"abstract": "We present a general analysis for the interaction of a probe laser radiation\nwith a coherently prepared molecular Raman medium. We describe a general\nformalism which includes dispersive effects, such as group velocity and group\nvelocity dispersion (GVD). When dispersion is negligible, the analysis is\nespecially simple and insightful. We show that molecular oscillations result in\na modulated instantaneous susceptibility of the medium. The effect of the\ntime-varying susceptibility on a probe laser pulse is two-fold: the output\nfrequency becomes modulated because of the time-varying phase velocity, and the\npulse shape becomes deformed because of the time-varying group velocity. We\nidentify two mechanisms for pulse compression: (1) Frequency chirping with\nsubsequent pulse compression by normal linear GVD (possibly in the same medium)\nand (2) Compression due to the time-varying group velocity. We analyze various\naspects of pulse compression in the coherent Raman medium and derive\nconservation relations for this process. When we consider a probe laser pulse\nwhich is much shorter than the molecular oscillation period, we observe\nfrequency chirping, compression, or stretching of this pulse, depending on its\nrelative timing with respect to the molecular oscillations. Based on our\nanalysis, we propose a method for selective compression or frequency conversion\nof single ultrashort pulses.",
"arxiv_id": "quant-ph/0207091",
"authors": [
"Fam Le Kien",
"K. Hakuta",
"A. V. Sokolov"
],
"categories": [
"quant-ph"
],
"title": "Pulse compression by parametric beating with a prepared Raman coherence",
"url": "https://arxiv.org/abs/quant-ph/0207091"
},
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