A near-infrared diode laser spectrometer of high resolution and wide scanning range

摘要

We have constructed a simple and inexpensive diode laser spectrometer in which the source is locked to and tracked by a scanning Fabry-Perot interferometer and in which absolute frequency measurements are made by markers generated by a further Fabry-Perot interferometer, itself locked either to a selected spectral line of the sample or to the saturated absorption of a D2 line in atomic Rb at 780 nm. With this technique we have been able to obtain near-continuous spectra stretching over the range from 12 640 to 12 780 cm(-1) at Doppler-limited resolution. In this paper we describe the principles of the spectrometer along with absolute frequency measurements of a number of overtone rovibrational transitions in two isotopomers of acetylene. The combination relations formed by these transitions demonstrate the accuracy of our measurements to be typically +/-0.0002 cm(-1). (C) 2002 Elsevier Science (USA). [References: 17]