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Sub-Doppler resolution limited Lamb-dip spectroscopy of NO with a quantum cascade distributed feedback laser

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Abstract

A quantum cascade distributed feedback laser operating at 5.2 µm is used to obtain sub-Doppler resolution limited saturation features in a Lamb-dip experiment on the R(13.5)1/2 and R(13.5)3/2 transitions of NO. The dips appear as transmission spikes with full widths of ~4.3 MHz. At this resolution the 73 MHz Λ-doubling of the R(13.5)3/2 line, which is normally obscured by the 130 MHz Doppler broadening, is easily resolved.

©2000 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Schematic of optical layout for Lamb-dip experiments.
Fig. 2.
Fig. 2. Etalon fringes and cell transmission recorded simultaneously with a rapid 1 cm-1 scan (~200 mA) of a QC-DFB laser. The frequency increases (current decreases) to the right. The measured difference between the higher R(13.5)1/2 line and the R(13.5)3/2 line is 0.8843 ±0.0003 cm-1, in agreement with the HITRAN database (0.88407 cm-1).
Fig. 3.
Fig. 3. Top panel: 1 GHz scan (plotted with absorption increasing in the positive direction) showing Lamb dips on the R(13.5)1/2 lines, obtained using the geometry in Fig. 1. Bottom panel: frequency derivative of the top panel. Experimental conditions: 1500 averages, 60 Hz repetition, 25 kHz sampling rate.
Fig. 4.
Fig. 4. Scan similar to that in Fig. 3 showing the 73 MHz splitting of the Λ-doubled components of the R(13.5)3/2 line. The lower panel shows the calculated absorbance.17
Fig. 5.
Fig. 5. Expanded Lamb dip from the f transition of Fig. 3, sampled at 100 kHz, after subtracting the Doppler background. The solid line is a Gaussian fit.
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