Time-resolved infrared spectral photography

D. S. Bethune; J. R. Lankard; P. P. Sorokin

doi:10.1364/OL.4.000103

Optics Letters
Vol. 4,
Issue 4,
pp. 103-105
(1979)
•https://doi.org/10.1364/OL.4.000103

Time-resolved infrared spectral photography

D. S. Bethune, J. R. Lankard, and P. P. Sorokin

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D. S. Bethune, J. R. Lankard, and P. P. Sorokin, "Time-resolved infrared spectral photography," Opt. Lett. 4, 103-105 (1979)

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Abstract

A new technique for time-resolved (5-nsec) recording of broadband infrared absorption spectra is demonstrated. Resonantly enhanced, third-order nonlinearities of metal vapors are used both to produce a pulsed infrared continuum that interrogates the sample and to upconvert this infrared continuum into the visible. Single-shot absorption spectra of CO₂ and H₂O bands in the region 2.55–2.85 μm were obtained.

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Alkali	Transition	λ(np)	ν,λ(np → ns)
Cs	7p_3/2 → 7s	4557 Å	3411 cm⁻¹ (2.93 μm)
	7p_1/2 → 7s	4594 Å	3230 cm⁻¹ (3.10 μm)
	8p_3/2 → 8s	3877 Å	1475 cm⁻¹ (6.78 μm)
	8p_1/2 → 8s	3890 Å	1392 cm⁻¹ (7.18 μm)
	9p_3/2 → 9s	3612 Å	771 cm⁻¹ (12.96 μm)
	9p_1/2 → 9s	3618 Å	727 cm⁻¹ (13.76 μm)
	10p_3/2 → 10s	3478 Å	454 cm⁻¹ (22.04 μm)
	11p_3/2 → 11s	3399 Å	291 cm⁻¹ (34.35 μm)
Rb	6p_3/2 → 6s	4203 Å	3659 cm⁻¹ (2.73 μm)
	6p_1/2 → 6s	4217 Å	3582 cm⁻¹ (2.79 μm)
	7p_3/2 → 7s	3588 Å	1559 cm⁻¹ (6.42 μm)
	8p_3/2 → 8s	3350 Å	807 cm⁻¹ (12.39 μm)
K	5p_3/2 → 5s	4045 Å	3693 cm⁻¹ (2.71 μm)
K	5p_1/2 → 5s	4048 Å	3674 cm⁻¹ (2.72 μm)

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Optics Letters