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Nonlinear Optics

Soliton-like propagation in biexciton two-photon resonant region

Masaru Sakai, Hideyuki Kunugita, Kazuhiro Ema, Masaya Nagai, Makoto K. Gonokami

Published Nov 27, 2002• 1 citation

Abstract

Soliton-like pulse propagation in the exciton resonant region is the issue of current interest because of their importance in the ultrafast optical switching devices. Although several types of polariton solitons at exciton resonance have been theoretically proposed, experimental studies for soliton-like propagation in such region have not been fully explored. Recently, we proposed a new scheme of soliton-like propagation supported by biexciton two-photon dispersion, and demonstrated a preliminary indication of our scheme using biexciton two-photon resonance (TPR) in CuCl. In the present study, we perform sub-ps pulse propagation experiments under several conditions using biexciton TPR in CuCl. We compare the results with the calculated results using the frequency domain wave equation. We obtain good agreement between them, and confirm soliton-like propagation supported by biexciton two-photon dispersion.

DOI: 10.1109/nlo.1998.710269

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Soliton-like pulse propagation in the exciton resonant region is the issue of current interest because of their importance in the ultrafast optical switching devices. Although several types of polariton solitons at exciton resonance have been theoretically proposed, experimental studies for soliton-like propagation in such region have not been fully explored. Recently, we proposed a new scheme of soliton-like propagation supported by biexciton two-photon dispersion, and demonstrated a preliminary indication of our scheme using biexciton two-photon resonance (TPR) in CuCl. In the present study, we perform sub-ps pulse propagation experiments under several conditions using biexciton TPR in CuCl. We compare the results with the calculated results using the frequency domain wave equation. We obtain good agreement between them, and confirm soliton-like propagation supported by biexciton two-photon dispersion.

Experimental evidence for the occurrence of optical bistability using the biexciton two-photon resonance in CuCl is presented. These observations agree with recent theoretical predictions that require an intensity of 10 MW/

{\mathrm{cm}}^{2}

and 10-\ensuremath{\mu}m-thick etalons with 90% reflective coatings. Earlier much less demanding predictions neglected two important physical effects: unsaturable background absorption at the biexciton from the tail of the exciton resonance and broadening of the biexciton resonance with intensity.