Speaker
Description
Recent advancements in single-photon detection, such as Single-Photon Avalanche Diodes (SPADs), have enabled picosecond-resolution measurements of photon arrival times. These technologies are crucial for applications like Satellite Laser Ranging (SLR) and Intensity Interferometry (II), where atmospheric effects on photon propagation remain a key limiting factor. Previous studies predicted 30-ps temporal fluctuations in photon arrival times due to atmospheric turbulence, potentially impacting high-precision timing experiments.
In this work, we investigate effects of the atmospheric broadening on zero-baseline intensity interferometry measurements in the lab and on a telescope with the Sun. We establish an upper limit of 6-ps RMS on the broadening of the Hanbury Brown and Twiss (HBT) peak induced by the atmosphere during observations of the Sun. Using a simple laboratory setup we show that the atmosphere should not affect the HBT peak for zero-baseline just because of time delays in the propagation time. We discuss techniques to measure non-zero baseline effects of atmosphere widening and provide estimations from theoretical considerations.
| Collaboration(s) | QUASAR Project |
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