Paired superradiance develops a vacuum-triggered instability that produces macroscopic bursts once the gain-length product exceeds ΓL=π/2, together with a closed-form estimate for the vacuum-seeded photon yield.
Externally triggered coherent two-photon emission from hydrogen molecules
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abstract
We report coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed the two-photon emission triggered by the internally generated fourth Stokes photons. By injecting independent mid-infrared pulses externally, it is possible to control experimental parameters and investigate the mechanism in more detail. In this article, we describe the two-photon emission using the external trigger pulses. Its spectrum and dependence on the energy and timing of the trigger pulse are presented along with numerical simulations based on the Maxwell-Bloch equations. The measured number of emitted photons is 6 10^11 photons/pulse and the resulting enhancement factor from the spontaneous emission is more than 10^18. This value is three orders of magnitude higher than that of the previous experiment. External control of emission process is expected to be essential for observation of weaker process of radiative emission of neutrino pair.
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physics.optics 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Vacuum-Triggered Instability in Paired Superradiance
Paired superradiance develops a vacuum-triggered instability that produces macroscopic bursts once the gain-length product exceeds ΓL=π/2, together with a closed-form estimate for the vacuum-seeded photon yield.