How to measure laser chirp rate at single-emitter excitation energies

• URL: http://arxiv.org/abs/2512.05541v1
• Date: Fri, 05 Dec 2025 08:55:15 GMT
• Title: How to measure laser chirp rate at single-emitter excitation energies
• Authors: Timothée Mounier, Moritz Kaiser, Mert Tuncel, Iker Avila Arenas, René Schwarz, Ria G. Krämer, Stefan Nolte, Florian Kappe, Yusuf Karli, Gregor Weihs, Vikas Remesh,
• Abstract summary: We present a simple and direct method for measuring laser chirp rate, i.e., group delay dispersion (GDD) of ultrashort laser pulses at power levels compatible with single-quantum-emitter excitation.<n>Traditional pulse characterization techniques rely on nonlinear optical processes that require high peak powers, making them unsuitable for the attojoule-to-femtojoule regime relevant to quantum photonics.<n>Our approach utilizes a wavelength-to-time mapping method in which the arrival times of spectrally filtered components of a broadband pulse are recorded using a superconducting nanowire single-photon detector and correlated via a high-
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a simple and direct method for measuring laser chirp rate, i.e., group delay dispersion (GDD) of ultrashort laser pulses at power levels compatible with single-quantum-emitter excitation. Traditional pulse characterization techniques rely on nonlinear optical processes that require high peak powers, making them unsuitable for the attojoule-to-femtojoule regime relevant to quantum photonics. Our approach utilizes a wavelength-to-time mapping method in which the arrival times of spectrally filtered components of a broadband pulse are recorded using a superconducting nanowire single-photon detector and correlated via a high-resolution time-tagging system. The resulting linear relationship between wavelength and arrival time directly yields the dispersion parameter and, subsequently, the GDD. Beyond single-emitter excitation, this technique can be applied in areas such as single-photon spectroscopy, ultralow-power optical communications, and time-domain quantum control, where linear and non-destructive dispersion characterization is essential.

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