Abstract
We use two mutually coherent, harmonically related pulse trains to experimentally characterize quantum interference control (QIC) of injected currents in low-temperature-grown gallium arsenide. We observe real-time QIC interference fringes, optimize the QIC signal fidelity, uncover critical signal dependences regarding beam spatial position on the sample, measure signal dependences on the fundamental and second harmonic average optical powers, and demonstrate signal characteristics that depend on the focused beam spot sizes. Following directly from our motivation for this study, we propose an initial experiment to measure and ultimately control the carrier-envelope phase evolution of a single octave-spanning pulse train using the QIC phenomenon.
Highlights
Control of the relative phase between the carrier wave and the pulse envelope from one pulse to the is critical for stabilizing mode-locked femtosecond laser systems [1,2,3]
We demonstrate real-time quantum interference control (QIC) interference fringes, optimize the QIC signal fidelity, uncover important signal dependences on beam spatial position, establish clear signal dependences on the fundamental and second harmonic average optical powers, and demonstrate the signal dependence on the focused beam spot size
The amplitude of our measured QIC signal is always smaller than that of the QIC voltage difference across the striplines
Summary
Control of the relative phase between the carrier wave and the pulse envelope (the carrierenvelope phase) from one pulse to the is critical for stabilizing mode-locked femtosecond laser systems [1,2,3]. Such coherence properties have enabled fascinating advances in optical waveform synthesis, optical frequency metrology, optical atomic clocks, and extreme nonlinear optics [2,9,10,11,12,13] Independent of this carrier-envelope phase stabilization work, other researchers have demonstrated that semiconductors can be sensitive to the relative phase between two coherent, harmonically related pulse trains (one at the optical frequency ν and one at 2ν) [14,15,16]. This sensitivity is due to currents generated by quantum interference between single- and twophoton absorption and has been observed in gallium arsenide and low-temperature-grown gallium arsenide (LT-GaAs). We predict an initial signal-tonoise ratio (SNR) of 5-10 dB (1 kHz bandwidth) for the QIC signal generated by a single octave-spanning pulse train if ~200 μW of useful light is present in each of the two spectral tails
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