Applied Physics B

, Volume 99, Issue 4, pp 657–671

Noise reduction in 3D noncollinear parametric amplifier

Open Access
Article

Abstract

We analytically find an approximate Bloch–Messiah reduction of a noncollinear parametric amplifier pumped with a focused monochromatic beam. We consider type I phase matching. The results are obtained using a perturbative expansion and scaled to the high-gain regime. They allow for a straightforward maximization of the signal gain and minimization of the parametric fluorescence noise. We find the fundamental mode of the amplifier, which is an elliptic Gaussian defining the optimal seed beam shape. We conclude that the output of the amplifier should be stripped of higher-order modes, which are approximately Hermite–Gaussian beams. Alternatively, the pump waist can be adjusted such that the amount of noise produced in the higher-order modes is minimized.

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Copyright information

© The Author(s) 2010

Authors and Affiliations

  1. 1.Institute of Experimental PhysicsUniversity of WarsawWarsawPoland

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