NDLI: Coherent polaritons and Cerenkov radiation at subluminal speeds

Content Provider	IEEE Xplore Digital Library
Author	Stevens, T.E. Wahlstrand, J.K. Merlin, R. Kuhl, J.
Copyright Year	2001
Description	Author affiliation: Dept. of Phys., Michigan Univ., Ann Arbor, MI, USA (Stevens, T.E.; Wahlstrand, J.K.; Merlin, R.)
Abstract	Summary form only given. As shown by Auston and co-workers, an ultrafast pulse moving in an electro-optic medium produces Cerenkov radiation (CR) if its group velocity c/sub g/, is greater than the phase velocity of light at infrared frequencies. The pulse generates a low-frequency polarization as it interacts with itself through a /spl chi//sup (2)/-process and, in so doing, it behaves as an optical analog of a relativistic dipole. Here, we demonstrate new and unexpected features of CR resulting from optical dispersion. Contrary to the common understanding, we identify conditions for which CR is emitted at subluminal but not at superluminal speeds, and we verify this prediction in pump-probe experiments on ZnSe. We also present calculations for a point source revealing that an arbitrary cone angle is actually associated with two velocities, one above and one below a certain speed threshold. Finally, we argue that CR due to optical nonlinearities and phase-matched excitation of phonon polaritons by ultrafast pulses are the same physical phenomenon.
Sponsorship	APS/Div. Laser Sci.
Starting Page	152
Ending Page	153
File Size	280969
Page Count	2
File Format	PDF
ISBN	155752663X
DOI	10.1109/QELS.2001.961984
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. Of America
Subject Keyword	Zinc compounds Optical polarization Stimulated emission Phonons Chromium Frequency conversion Optical pumping Ultrafast optics Optical frequency conversion Optical pulse generation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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