Variable electro-optic shearing interferometry for ultrafast single-photon-level pulse characterization

• URL: http://arxiv.org/abs/2207.14049v2
• Date: Tue, 6 Feb 2024 10:09:32 GMT
• Title: Variable electro-optic shearing interferometry for ultrafast single-photon-level pulse characterization
• Authors: Stanis{\l}aw Kurzyna, Marcin Jastrz\k{e}bski, Nicolas Fabre, Wojciech Wasilewski, Micha{\l} Lipka, Micha{\l} Parniak
• Abstract summary: We introduce a pulse characterisation scheme that maps the magnitude of its short-time Fourier transform. Our method is based on introducing a series of controlled time and frequency shifts. We successfully reconstructed the spectral phase and amplitude of a single-photon-level pulse.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Despite the multitude of available methods, the characterisation of ultrafast pulses remains a challenging endeavour, especially at the single-photon level. We introduce a pulse characterisation scheme that maps the magnitude of its short-time Fourier transform. Contrary to many well-known solutions it does not require nonlinear effects and is therefore suitable for single-photon-level measurements. Our method is based on introducing a series of controlled time and frequency shifts, where the latter is performed via an electro-optic modulator allowing a fully-electronic experimental control. We characterized the full spectral and temporal width of a classical and single-photon-level pulse and successfully reconstructed their spectral phase and amplitude. The method can be extended by implementing a phase-sensitive measurement and is naturally well-suited to partially-incoherent light.

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