Hearing carrier-envelope offset frequency and phase in air with a microphone

2024/11/13 by Han, Meng, Chen, Ming-Chang, Tsai, Ming-Shian +1 · 3 citations
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Optics (physics.optics)

paper · doi:10.48550/arxiv.2411.08304

Abstract

Attosecond science and frequency metrology rely on the precise measurement and control of the laser pulse waveform, a feat traditionally achieved using optoelectronic techniques. In this study, we conducted a laser-induced acoustic experiment in air ionized by carrier-envelope phase (CEP)-stabilized sub-4 femtosecond pulses. Our results reveal that the acoustic signal exhibits CEP dependence in few-cycle pulses, primarily through amplitude modulation from laser-driven ionization. This novel optoacoustic phenomenon enables not only the measurement of the carrier-envelope offset frequency but also the direct characterization of the waveform of optical pulses through a microphone. Our study highlights the potential of laser-induced acoustic waves for advancing frequency metrology and ultrafast science.

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