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The ac Stark effect in nitric oxide induced by rapidly swept continuous wave quantum cascade lasers
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10.1063/1.4710541
/content/aip/journal/jcp/136/17/10.1063/1.4710541
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/17/10.1063/1.4710541

Figures

Image of FIG. 1.
FIG. 1.

A schematic diagram of the fine structure associated with the e-f Λ-doubling of the 1-0 R(11.5)3/2 transitions in 14NO. Possible coupled pairs of V, (e-f, J = 12.5), and inverted V, (e-f, J = 11.5), are shown. The dashed lines show the dipole-allowed, laser field-induced coupling between the e and f Λ-doublet states.

Image of FIG. 2.
FIG. 2.

The calculated electric field induced splitting of the e-f Λ-doublet pair of J = 11.5, v = 0. These model calculations assume a dc field strength of 0–15 kV/cm. The similarity between the patterns measured with ac fields and those observed using dc fields has been pointed out by Townes and Schawlow,17 and more recently by Auzinsh et al. 18

Image of FIG. 3.
FIG. 3.

Rapid sweep spectra of the 1-0 R(11.5)3/2 transition in 14NO, recorded using the slow detector channel. The path length was 100 m, and the NO pressure 0.119 Torr. The laser current sweep frequencies in kHz were (1) 0.1013, (2) 0.2013, (3) 0.5013, and (4) 1.013. The corresponding laser frequency sweep rates in MHz/μs were (1) 1.2, (2) 2.4, (3) 6, and (4) 12.

Image of FIG. 4.
FIG. 4.

Rapid sweep spectra of the 1-0 R(11.5) transitions in 14NO, recorded using the fast detector channel. The detector signals are in arbitrary units. The path length and gas pressure are as shown in Figure 3. The laser current sweep frequencies in kHz were (a) 2.013, (b) 5.013 (c) 10.013, and (d) 20.013. The corresponding laser frequency sweep rates in MHz/μs were (1) 23.8, (2) 59.4, (3) 118.6, and (4) 237.1. For each laser sweep rate, examples of two spectra are shown corresponding to two types of trigger delay used when recording the fast channel spectra. The similarity of the spectral pairs shows that the envelopes of the Autler-Townes doubling depend upon the laser sweep rate rather than any change in the method of recording these spectra.

Image of FIG. 5.
FIG. 5.

The variation of the magnitude of the rapid passage-induced Autler-Townes splitting of the 1-0 R(11.5)3/2 transition in 14NO. The magnitude is inferred from the width of the splitting (circles), and the relative depth of the Autler-Townes feature (crosses). The open and filled circles, and the two types of cross, represent measurements using the two trigger delay schemes. The values of the parameters are given in Table I.

Tables

Generic image for table
Table I.

Values of the parameters of all the spectral parameters plotted in Figures 3–5.

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/content/aip/journal/jcp/136/17/10.1063/1.4710541
2012-05-07
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The ac Stark effect in nitric oxide induced by rapidly swept continuous wave quantum cascade lasers
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/17/10.1063/1.4710541
10.1063/1.4710541
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