# Stuttgart 2012 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# Q: Fachverband Quantenoptik und Photonik

## Q 35: Poster 2

### Q 35.84: Poster

### Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II

**Statistics of single-mode bright squeezed vacuum** — Timur Iskhakov^{1}, •Angela Perez^{1}, Kirill Spasibko^{2}, Maria Chekhova^{1,2}, and Gerd Leuchs^{1} — ^{1}Max-Planck Institute for the Science of Light, Guenther-Scharowsky-Str. 1 / Bau 24, Erlangen D-91058, Germany — ^{2}Physics Department, Moscow State University, Leninskiye Gory 1-2, Moscow 119991, Russia

We study the statistics of single-mode (SM) bright squeezed vacuum produced at the output of a type I collinear optical parametric amplifier by the measurement of its second-order correlation function *g*^{(2)}. We implement special detection conditions which require the detection volume to be much smaller than the coherence volume in order to observe photon bunching in the nondegenerate regime and photon superbunching in the degenerate regime. These effects are ideally manifested by reaching a value of *g*^{(2)}=2 and *g*^{(2)}=3 respectively, given that the mean photon number per mode (*N*) is large. Observation of SM statistics of the states considered is a difficult experimental problem because they are essentially multimode and should remain macroscopic after SM selection. In our experiment we have measured values of *g*^{(2)}=1.84 and *g*^{(2)}=2.58 due to the fact that the detection volume is restricted from below by the spectral bandpass of the monochromator, only twice as narrow as the estimated spectral mode size. On the contrary, the detected angle was much smaller than the angular mode size which results in an effective number of detected spatio-temporal modes (*m*=1.25) small enough to observe SM statistics. After SM selection, *N* ≈ 8 × 10^{3} photons per pulse which is remarkably high.