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Optics Letters

Analytical approach to all-optical modulation by cascading

Andrey E. Kobyakov, Ulf Peschel, R. Muschall, Gaetano Assanto, Vladimir Pavlovich Torchigin, F. Lederer

Published Aug 15, 1995• 23 citations
Publisher

Abstract

We study analytically all-optical modulation by cascading in type II second-harmonic generation and show that this configuration is promising for all-optical signal processing, provided that it is operated near phase matching. Conditions for an effective transistorlike action are derived.
DOI
10.1364/ol.20.001686

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The scope of this paper is to revisit the use of quadratic crystals cut for second harmonic generation (SHG) with type II phase-matching in view of all-optical processing of light signal. The investigations on this topic mainly focused in the past years on the possibilities opened by cascading of quadratic nonlinearities in phase-mismatched conditions [1]. The goal of this paper is to remind the reader that various types of optical processing are achievable with sum and difference frequency generation in phase-matched position without the requirement for cascaded nonlinearities. In a first part we will report few examples of the use of difference frequency generation (or down conversion) for signal processing. In a second part we will show that type II SHG with unbalanced fundamental inputs may lead to coherent amplification or transistor like operation.
Cascaded second-order nonlinearities (CSON) and parametric downconversion (PD) are suggested as basis for phase insensitive all-optical transistor (AOT) action using type-II second harmonic generating (SHG) crystals. Both devices are tested using, in the CSON-based AOT, two type II KTP crystals in tandem and, in the PD-based, a SHG crystal and a type II KTP crystal. Both configurations were independent of the phase of the signal, however, the output of the first was coherent, while that of the second was incoherent. Therefore, the PD device output is a coherently amplified version of the input, while in the cascaded device the signal imposes a modulation of the power supply. Experimental fluence gains agree well with numerical modelling.