Journal article
On the coherent modes of ultranarrowband random lasers with nonresonant feedback
Applied optics (2004), Vol.50(25), pp.E13-E19
09/01/2011
DOI: 10.1364/AO.50.000E13
Abstract
We study the variation of the coherent modes in the emission of a coherent random laser based on non-resonant feedback at critical excitation. A baseline-finding algorithm is applied to separate the coherent and incoherent components from the complete spectrum. By applying intensity thresholds to the isolated coherent spectrum, the modal density is measured as a function of mode intensity, which shows an exponential decay, corresponding to the probability of amplified extended modes. We measure the magnitude of the coherent intensity in the maximally coherent modes, whose distribution shows the presence of equal magnitude of coherent and incoherent fraction in any mode. Upon higher-than-critical excitation, instead of increasing the coherent fraction in the modes, the system tends to increase the number of modes that leads to self-averaging of the spectrum, thereby compromising the coherence. (C) 2011 Optical Society of America
Details
- Title: Subtitle
- On the coherent modes of ultranarrowband random lasers with nonresonant feedback
- Creators
- Ravitej Uppu - Tata Institute of Fundamental ResearchSushil Mujumdar - Tata Institute of Fundamental Research
- Resource Type
- Journal article
- Publication Details
- Applied optics (2004), Vol.50(25), pp.E13-E19
- Publisher
- Optical Soc Amer
- DOI
- 10.1364/AO.50.000E13
- ISSN
- 1559-128X
- eISSN
- 2155-3165
- Number of pages
- 7
- Language
- English
- Date published
- 09/01/2011
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984442196802771
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