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Springer series in chemical physics

High Power, Picosecond Phase Coherent Pulse Sequences by Injection Locking

Frank C. Spano, F Loaiza, Mark Haner, W. S. Warren

Published Jan 1, 1984• 0 citations
Publisher
DOI
10.1007/978-3-642-82378-7_29

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 28, 2000•0 citations
Raman pulse sequences are generally used to coherently manipulate the atomic wave packet in an atom interferometer.High power Raman beams allow more atoms join in the velocity-sensitive stimulated Raman transition,and that will be helpful for obtaining high signal to noise ratio in atom interferometer fringe.Development of high power Raman laser is important for cold atom interferometer experiments.The experimental realization of high power Raman lasers are demonstrated based on injection locking technique. Master laser is modulated by a 1.5 GHz acousto-optical modulator,and the±1 order diffraction lights are used as seeding Raman lasers.The seeding lasers are injection locked to two slave lasers which are further amplified as Raman beams.The frequency difference of Raman beams is 3.0 GHz,and the detuning range is about 200 MHz.
In this paper, we report ultrafast manipulation of coherent excitons in quantum-wells using phase locked pulse sequence prepared by a frequency domain shaping technique. The pulse shaping system with double liquid crystal spatial light modulator (SLM) and the Ti3+-sapphire laser are used to generate phase-locked pulses. Ultrafast coherent control of exciton population and exciton polarization is demonstrated by the observation of the reflectivity-change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing measurements. In the single quantum wells, good coherent control characteristics with 87% of coherent carrier destruction is demonstrated at low excitation power of 0.15 mW (approximately 1.1 X 1010 photons/cm2). Also the preliminary manipulation of the exciton population is demonstrated by the phase locked multi-pulses. In case of coupled quantum-wells, the modulation of SLM is carefully controlled and coherent control of both the exciton population and the polarization are demonstrated in the two different coupled quantum well samples.