Abstract
The wavenumber λ d of a tunable diode laser (TDL) is actively forced to preserve its interference order k d through a Michelson interferometer with a path difference D ( D = k d × λ d). This path difference and its variation ΔD are controlled by a stabilised He Ne laser. A change ΔD induces λ d to change by an amount Δλ d. This procedure reduces by two orders of magnitude the usual jitter of a TDL wavenumber emission. Several applications of this precise instrument (line shifts, line mixing effect, deconvolution of denses spectra) are given.
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