Characterization of an external cavity diode laser based ring cavity NICE-OHMS system.
The performance of an external cavity diode laser based noise immune cavity enhanced optical heterodyne molecular spectrometer is presented. To reduce the noise on the signal a ring cavity and a circuit to remove residual amplitude modulation on the pre-cavity laser radiation was implemented. We demonstrate a sensitivity of 4 x 10(-11) cm(-1) Hz(-1/2) using a cavity with a finesse of 2600 on a Doppler-broadened transition of CH(4) at 6610.063 cm(-1).
Bell
C L
CL
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK.
Hancock
G
G
Peverall
R
R
Ritchie
G A D
GA
van Helden
J H
JH
van Leeuwen
N J
NJ
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D054023:Lasers, Semiconductor; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers