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arXiv:1010.4693

Generation Efficiency of the Second Harmonic Inhomogeneous Component

V. Roppo, Fabrice Raineri, Crina M. Cojocaru, Rama K. Raj, J. Trull, Isabelle Sagnes, Ramon A. Vilaseca, Michael Scalora

Published Oct 22, 2010• 5 citations
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Abstract

In this letter we experimentally demonstrate second harmonic conversion in the opaque region of a GaAs cavity with efficiencies of the order of 0.1% at 612nm, using 3ps pump pulses having peak intensities of order of 10MW/cm2. We show that the conversion efficiency of the inhomogeneous, phase-locked second harmonic component is a quadratic function of the cavity factor Q.

DOI
10.48550/arxiv.1010.4693

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In this letter we experimentally demonstrate second harmonic conversion in the opaque region of a GaAs cavity with efficiencies of the order of 0.1% at 612nm, using 3ps pump pulses having peak intensities of order of 10MW/cm2. We show that the conversion efficiency of the inhomogeneous, phase-locked second harmonic component is a quadratic function of the cavity factor Q.
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A study is made of the evolution of ultrashort pulses of interrogation and generated fields, traveling across a medium after a pump pulse under two-photon resonance conditions. It is shown that, in spite of the absence of overlap of the pulses in space and time, the generated wave becomes phase-locked. The area theorem is obtained for the process in question. It is found that at large distances the second pulse should give rise to a subpulse of the interrogation field and a proportional subpulse whose area tends to zero or to 2π. This conclusion about the formation of subpulses and their limiting areas applies also in the two-photon interaction case. A report is given of an estimate of the threshold intensities of an interrogation pulse in cesium and sodium vapors. The maximum conversion efficiency is found as a function of the pump energy, parameters of the investigated medium, and frequencies of the interacting fields. It is shown that an overall conversion efficiency close to 100% can be obtained when the intensities of the pump and interrogation fields are within the capabilities of the currently available lasers.
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We examine the effects of inhomogeneous broadening on second-order nonlinearities in intersubband-based quantum-well systems. In particular, we study the case of difference-frequency generation in a doubly resonant system, providing, to our knowledge, the first analysis of conversion efficiencies. For even modest amounts of inhomogeneous broadening both the peak conversion efficiency and the optimum interaction length may vary by more than a factor of 3 from that predicted by homogeneous theories.