High-information time-resolved Fourier transform spectroscopy at work

Nathalie Picqué; Guy Guelachvili

doi:10.1364/AO.39.003984

Applied Optics
Vol. 39,
Issue 22,
pp. 3984-3990
(2000)
•https://doi.org/10.1364/AO.39.003984

High-information time-resolved Fourier transform spectroscopy at work

Nathalie Picqué and Guy Guelachvili

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Nathalie Picqué and Guy Guelachvili, "High-information time-resolved Fourier transform spectroscopy at work," Appl. Opt. 39, 3984-3990 (2000)

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Abstract

The first instrumental setup, to our knowledge, that is capable of recording in a few hours the time-resolved Fourier transform (TRFT) interferograms of gas-phase spectra that cover several thousands of inverse centimeters with spectral- and time-resolution limits that are equal, at best, to 2.5 × 10^-3 cm^-1 and 2 ns, respectively, is reported. It was developed on the stepping-mode Connes-type interferometer of the Laboratoire de Photophysique Moléculaire Université de Paris Sud. Also, for the first time, to our knowledge, these high-resolution TRFT spectra, illustrated with the Doppler-limited emission spectra of the N ₂ transitions (B–A) and (B′–B) between 5500 and 11 000 cm^-1 and of the atomic Ar lines between 1800 and 4000 cm^-1, are recorded in the infrared spectral range. To obtain identical results that have the same signal-to-noise ratio, we should have increased the recording time of our unique previous high-information TRFT spectra by approximately 50,000. In other words, one hour is now long enough to obtain what would previously have required six years to record.

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Source	Number of the Spectrum	Number of Time Samples	Time Resolution (µs)	Spectral Range (cm^-1)	Unapodized Spectral Resolution (cm^-1)	Experiment’s Duration (h)	Amount of Data (Gbytes)
Microwave discharge in N₂, p = 0.5 Torr	247	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 4.5 Torr	252	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 1.5 Torr	255	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 9.3 Torr	258	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 3.2 Torr	264	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Electrical discharge in Ar/H₂/He	230	64	1	1800–3600	7 × 10^-3	11	8
Microwave discharge in N₂, p = 3.2 Torr	236	64	3.2	8676–17 352	29 × 10^-3	5	1.2
Microwave discharge in N₂, p = 3.2 Torr	237	256	0.8	8680–17 360	29 × 10^-3	8	3.5

Recording Conditions	Spectrum of Ref. 15	Spectrum 237 in This Study
Spectral range (cm^-1)	8676–17 352	8676–17 352
Unapodized spectral resolution (cm^-1)	0.03	0.03
Number of spectral elements	300,000	300,000
Experiment’s duration (h)	30	8
Time resolution (µs)	3.125	0.8
Number of time samples	32	256
Time excursion (µs)	100	204.8
P _N₂ (Torr)	3.2	3.2
Number of temporal gains	1	2
Co-additions	4	32
Total number of independent data	32 × 300,000 = 9,600,000	256 × 300,000 = 76,800,000

Source	Number of the Spectrum	Number of Time Samples	Time Resolution (µs)	Spectral Range (cm^-1)	Unapodized Spectral Resolution (cm^-1)	Experiment’s Duration (h)	Amount of Data (Gbytes)
Microwave discharge in N₂, p = 0.5 Torr	247	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 4.5 Torr	252	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 1.5 Torr	255	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 9.3 Torr	258	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Microwave discharge in N₂, p = 3.2 Torr	264	128	1.6	5459–10 918	14 × 10^-3	10	6.1
Electrical discharge in Ar/H₂/He	230	64	1	1800–3600	7 × 10^-3	11	8
Microwave discharge in N₂, p = 3.2 Torr	236	64	3.2	8676–17 352	29 × 10^-3	5	1.2
Microwave discharge in N₂, p = 3.2 Torr	237	256	0.8	8680–17 360	29 × 10^-3	8	3.5

Recording Conditions	Spectrum of Ref. 15	Spectrum 237 in This Study
Spectral range (cm^-1)	8676–17 352	8676–17 352
Unapodized spectral resolution (cm^-1)	0.03	0.03
Number of spectral elements	300,000	300,000
Experiment’s duration (h)	30	8
Time resolution (µs)	3.125	0.8
Number of time samples	32	256
Time excursion (µs)	100	204.8
P _N₂ (Torr)	3.2	3.2
Number of temporal gains	1	2
Co-additions	4	32
Total number of independent data	32 × 300,000 = 9,600,000	256 × 300,000 = 76,800,000

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Applied Optics