Initial data and ideas for new 3 week version of single photon studies.

Part I

Setup

Radius of curvature of guide = 84cm.

APD PULSES : Positive polarity, 4.3V, 16.5ns FWHM.

TAC set to 0.05μs range.

LASER Current = 70.7mA LASER Temp = 10.31°C

Alignment and detection

Down Conversion Studies

Study of the DC dependence on pump beam polarization.

Angle Coincidences Green APD Blue APD
0 136 8178 8000
10 1031 28736 16666
20 2686 66757 34285
30 3987 95635 46844
40 4472 106916 53472
45 4202 102661 52802
50 3903 93144 48764
60 2539 62332 33887
70 1055 29170 17967
80 94 7157 7185
90 136 8403 7653