Variation of harmonic spectra in laser-produced plasmas at variable phase of femtosecond laser pulses of different bandwidth
- Raja Ramanna Centre for Advanced Technology, Indore 452013 (India)
- Institute of Electronics, Uzbekistan Academy of Sciences, Akademgorodok, 33, Dormon Yoli Street, Tashkent 100125 (Uzbekistan)
The intensity enhancement of harmonics and change in harmonic profiles have been observed in a few plasma plumes (La, In, Mn) under variable phase modulation of Ti:sapphire laser pulses. It is seen that variation of relative harmonic intensities in the plateau region could be achieved by chirp variation of narrowband ({approx}10 nm bandwidth) radiation. The effect of the self-phase modulation (SPM) of broadband ({approx}20 nm bandwidth) laser radiation on the harmonic emission from nanoparticles, C{sub 60}, and Ag plasma while passing through a glass slab is also studied. The observation of broadband harmonic emission and redshift in harmonic wavelengths for an unchirped laser pulse are explained in terms of SPM. The observation of blueshift of harmonic radiation with both positively and negatively chirped pulses was attributed to the different effects of SPM on the chirped pulses.
- OSTI ID:
- 22046832
- Journal Information:
- Journal of the Optical Society of America. Part B, Optical Physics, Vol. 26, Issue 11; Other Information: (c) 2009 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0740-3224
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
EMISSION SPECTRA
FULLERENES
GLASS
HARMONIC GENERATION
HARMONICS
LANTHANUM
LASER RADIATION
LASER-PRODUCED PLASMA
MANGANESE
MODULATION
NANOSTRUCTURES
PARTICLES
PHOTON EMISSION
PLASMA PRODUCTION
PULSES
RED SHIFT
SAPPHIRE
SOLID STATE LASERS
VARIATIONS