Noise analysis and noise reduction methods in kilohertz pump-probe experiments.
We analyze sources of noise in kilohertz frequency pump/probe experiments and present a method for reducing experimental noise by identifying and filtering noisy shots. The power spectrum of instrumental noise shows high frequency, small amplitude modulations which cannot be averaged out. A histogram analysis shows that low frequency, large amplitude signals pose a serious obstacle to signal averaging for improved signal to noise. In kilohertz frequency pump/probe experiments, this low frequency noise typically arises from laser scatter due to bubbles, dust, and defects. We quantify the effectiveness in analyzing and rejecting these large amplitude signals which can produce a hindrance to the effectiveness of signal averaging.
Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada.
Kevin E H
KE
Anderson
Samuel L
SL
Sewall
Ryan R
RR
Cooney
Patanjali
P
Kambhampati
D000465:Algorithms; D016477:Artifacts; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D011846:Radio Waves; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted