Self induced focusing and defocusing of femtosecond pulses in Raman-active media

The results of analytical and numerical investigation of the propagation of space-limited ultrashort (pulse duration is shorter than all the relaxation times and the time scale of the medium response) light pulse in Raman-active media are represented. This process shown reveals a number of novel spe...

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Bibliographic Details
Main Authors: Isakov, Vladimir A, Kanavin, Andrei P, Smetanin, Igor V
Format: Conference Proceeding
Language:English
Subjects:
Amorphous materials
Delay effects
Laser excitation
Optical pulses
Optical scattering
Probes
Pulse amplifiers
Pulse measurements
Pump lasers
Ultrafast optics
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Summary:The results of analytical and numerical investigation of the propagation of space-limited ultrashort (pulse duration is shorter than all the relaxation times and the time scale of the medium response) light pulse in Raman-active media are represented. This process shown reveals a number of novel specific features. It is found that at definite pulse energy the self- induced focusing is replaced by the self-induced defocusing which is again followed by the selffocusing. As a result a light channel which consists of a train of moving focuses occurs on the light beam axis. The rate of self-induced focusing and defocusing processes for this propagation regime is inversely proportional to the pulse field intensity, which is contrary to the conventional selffocusing theory.
ISSN:0277-786X
DOI:10.1117/12.239801