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--- howto:t3r_antibunching_-_slow_decay [2022/02/01 10:52] – [Antibunching by histogramming - Slow Decay] peter
+++ howto:t3r_antibunching_-_slow_decay [2022/02/01 11:32] (current) – [A decay caused by correlation statistics] peter
@@ Line 3: / Line 3: @@
 ====== Artefacts in Antibunching Histograms - Slow Decay ======
-===== Q.: How can we avoid decay at very long time delay (up to 5us)? =====
-==== In this show-case the external preconditions are: ====
-- detectors: perkin elmer SPCMAQR14
-- 700 nm SP filter in front of one of the APDs
-- sample: diamond nanocrystals (100 nm), we are measuring the antibunching of the NV centers emission
+==== A decay caused by correlation statistics ====
-- laser wavelength: 532 nm, cw
+[{{howto:slope.png ?478x300|Fig. 1: Baseline decay }}]
-- T3R Measurement with PicoHarp Software
-===== A.: The decay can be caused by blinking of the nanodiamonds. =====
-==== A decay caused by correlation statistics ====
 This decay is caused by correlation statistics. This happens because you correlate the first arriving photon against a photon at the longer time, which will be an increasingly unlikely event because the earliest stop photons always win and the experiment restarts.
-I attached a simulation.
+A simulation with 90ns dead-time period:
-[{{howto:logf.png?320x240|Fig. 1: Logfile logf.png }}]
+[{{howto:logf.png?320x240|Fig. 2: Simulation }}]