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Title: Asymmetric properties between the forward and backward stimulated emission generated by ultrafast three- and four-photon excitation

Abstract

This paper presents the observation of asymmetric behavior between the forward and backward stimulated emission, generated in multiphoton active dye solutions, through three- or four-photon excitation of subpicosecond laser pulses. At a pump energy level considerably higher than the lasing threshold value, the peak wavelengths of the forward stimulated emission are 20-30-nm shorter than those of the backward stimulated emission for the two investigated stilbazolium dye solutions (PRL-L3 and PRL-L10). This obvious spectral asymmetry can be explained by the following three considerations: (i) the difference of spatial/temporal sequences between the forward and backward stimulated emission pulses; (ii) blueshift of the peak wavelength of transient gain experienced by the forward stimulated emission pulse; and (iii) saturation of reabsorption at the forward lasing wavelength range. These proposed explanations are verified by a specially designed pump-probe experiment, utilizing a white-light continuum as the probe beam and the {approx}1300-nm laser radiation as the pump beam for three-photon excitation. The experimental results have clearly shown the existence of the saturation effect of reabsorption and the gain-peak blueshift effect as well as their transient features.

Authors:
; ; ; ; ;  [1]
  1. Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo, Buffalo, New York 14260 (United States)
Publication Date:
OSTI Identifier:
20786995
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.73.033815; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ASYMMETRY; ENERGY LEVELS; EXCITATION; GAIN; LASER RADIATION; MATHEMATICAL SOLUTIONS; MULTI-PHOTON PROCESSES; PHOTONS; PULSES; SPECTRAL SHIFT; STIMULATED EMISSION; TRANSIENTS; WAVELENGTHS

Citation Formats

He, Guang S, Changgui, Lu, Qingdong, Zheng, Baev, Alexander, Samoc, Marek, and Prasad, Paras N. Asymmetric properties between the forward and backward stimulated emission generated by ultrafast three- and four-photon excitation. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.0.
He, Guang S, Changgui, Lu, Qingdong, Zheng, Baev, Alexander, Samoc, Marek, & Prasad, Paras N. Asymmetric properties between the forward and backward stimulated emission generated by ultrafast three- and four-photon excitation. United States. doi:10.1103/PHYSREVA.73.0.
He, Guang S, Changgui, Lu, Qingdong, Zheng, Baev, Alexander, Samoc, Marek, and Prasad, Paras N. Wed . "Asymmetric properties between the forward and backward stimulated emission generated by ultrafast three- and four-photon excitation". United States. doi:10.1103/PHYSREVA.73.0.
@article{osti_20786995,
title = {Asymmetric properties between the forward and backward stimulated emission generated by ultrafast three- and four-photon excitation},
author = {He, Guang S and Changgui, Lu and Qingdong, Zheng and Baev, Alexander and Samoc, Marek and Prasad, Paras N},
abstractNote = {This paper presents the observation of asymmetric behavior between the forward and backward stimulated emission, generated in multiphoton active dye solutions, through three- or four-photon excitation of subpicosecond laser pulses. At a pump energy level considerably higher than the lasing threshold value, the peak wavelengths of the forward stimulated emission are 20-30-nm shorter than those of the backward stimulated emission for the two investigated stilbazolium dye solutions (PRL-L3 and PRL-L10). This obvious spectral asymmetry can be explained by the following three considerations: (i) the difference of spatial/temporal sequences between the forward and backward stimulated emission pulses; (ii) blueshift of the peak wavelength of transient gain experienced by the forward stimulated emission pulse; and (iii) saturation of reabsorption at the forward lasing wavelength range. These proposed explanations are verified by a specially designed pump-probe experiment, utilizing a white-light continuum as the probe beam and the {approx}1300-nm laser radiation as the pump beam for three-photon excitation. The experimental results have clearly shown the existence of the saturation effect of reabsorption and the gain-peak blueshift effect as well as their transient features.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 73,
place = {United States},
year = {2006},
month = {3}
}