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Proceedings Paper

Control Of Transient Raman Amplifiers
Author(s): M D Duncan; R Mahon; L L Tankersley; J Reintjes
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Paper Abstract

We have studied the phase pulling and locking of an injected Stokes pulse in a transient Raman amplifier both experimentally and theoretically. In addition, we have investigated the pulse energy statistics and related spatial modes of a high gain amplified Stokes pulse. Experiments reported here show that in the unsaturated case, the phase of the amplified Stokes is pulled almost instantaneously to that of the pump, as soon as integrated gain levels of slightly greater than unity are reached. For higher input seed-Stokes levels, such that the amplified Stokes energy is saturated, the phase locking is completed early, and the phase of the amplified Stokes then follows the phase excursion of the pump. The phase pulling has been modelled theoretically for the specific parameters of our experiment. We have also used the pulse energy statistics to study the seed-Stokes control of a high gain Raman amplifier. For an input seed-Stokes beam to control a transient, high gain Raman amplifier, operated near threshold, it must dominate the self-generated Raman which builds from quantum noise. For a near-unity-Fresnel-number Raman amplifier we have measured the number of input seed-Stokes photons needed to produce an unchanged statistical signature on the amplified Stokes pulse and have found that a surprisingly large number (109) were needed. For a larger Fresnel number Raman amplifier, a near-field camera was used to study the level at which the seed-Stokes pulse controlled the spatial output of the amplifier. Control of the spatial modes seems to have a sharp threshold with input Stokes energy and was fully established with an input of 2x103 photons per mode.

Paper Details

Date Published: 8 April 1988
PDF: 8 pages
Proc. SPIE 0874, Nonlinear Optical Beam Manipulation, Beam Combining, and Atmospheric Propagation, (8 April 1988); doi: 10.1117/12.943855
Show Author Affiliations
M D Duncan, Naval Research Laboratory (United States)
R Mahon, Naval Research Laboratory (United States)
L L Tankersley, Naval Research Laboratory (United States)
J Reintjes, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0874:
Nonlinear Optical Beam Manipulation, Beam Combining, and Atmospheric Propagation
Robert A. Fisher, Editor(s)

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