Abstract：
:Interaction of light with media often occurs with a femtosecond response time. Its measurement by conventional techniques requires the use of femtosecond lasers and sophisticated time-gated optical detection. Here we demonstrate that by exploiting quantum interference of entangled photons it is possible to measure the dephasing time of a resonant media on the femtosecond time scale (down to 100 fs) using accessible continuous wave laser and single-photon counting. We insert a sample in the Hong-Ou-Mandel interferometer and observe the modification of the two-photon interference pattern, which is driven by the coherent response of the medium, determined by the dephasing time. The dephasing time is then inferred from the observed pattern. This effect is distinctively different from the basic effect of spectral filtering, which was studied in earlier works. In addition to its ease of use, our technique does not require compensation of group velocity dispersion and does not induce photo-damage of the samples. Our technique will be useful for characterization of ultrafast phase relaxation processes in material science, chemistry, and biology.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kalashnikov DA,Melik-Gaykazyan EV,Kalachev AA,Yu YF,Kuznetsov AI,Krivitsky LAdoi
10.1038/s41598-017-11694-zsubject
Has Abstractpub_date
2017-09-13 00:00:00pages
11444issue
1issn
2045-2322pii
10.1038/s41598-017-11694-zjournal_volume
7pub_type
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