Optical spectroscopy

Schmidt, Florian M.; Metsälä, Markus; Apolonski, Alexander; Cristescu, Simona M.

doi:10.1016/b978-0-12-819967-1.00014-1

Cited by 2 publications

(3 citation statements)

References 40 publications

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“…The nominal spectral resolution can be significantly improved by a factor 2 to 4 by increasing the size of the RDL or by increasing the number of reflections (N in Eqn. (1)). An increased temporal resolution is also readily achievable by replacing the existing motor with a magnetically levitated one.…”

Section: Discussionmentioning

confidence: 99%

“…Real-time monitoring of non-repetitive events is currently a rapidly developing area in the field of instrumentation [1]. Rapid optical analysis in applications such as chemical reaction monitoring [2], protein dynamics [3], micromachining [4] or phase transitions in novel material systems [5] is of uttermost importance to understand the underlying complex dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…)(1) and corresponds to the case with zero OPD and no Doppler shift. Increasing α to 20 degrees impacts the repetition rate of the comb (f rep2 = f rep1 • (1 + v(α = 20 • )/c)) as well as the absolute frequencies of the individual optical modes, which acquire a Doppler shift as well (Fig.3 (d)(2)).…”

mentioning

confidence: 99%

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Frequency chirped Fourier-Transform spectroscopy

Markmann¹,

Frankié²,

Mathieu³

et al. 2022

Preprint

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Fast (sub-second) spectroscopy with high spectral resolution is of vital importance for revealing quantum chemistry kinetics of complex chemical and biological reactions. Fourier transform (FT) spectrometers can achieve high spectral resolution and operate at hundreds of ms time scales in rapid-scan mode. However, the linear translation of a scanning mirror imposes stringent time-resolution limitations to these systems, which makes simultaneous high spectral and temporal resolution impossible. Here, we demonstrate an FT spectrometer whose operational principle is based on continuous rotational, rather than linear, motion of the scanning mirror, decoupling the spectral resolution from the temporal one. This enables 0.5 cm −1 resolution on sub-ms time scales. Furthermore, we show that such rotational FT spectrometers can perform dual-comb spectroscopy with a single comb source, since the Doppler-shifted version of the comb serves as the second comb. In this way, we combine the advantages of dual-comb and FT spectroscopy using a single quantum cascade laser frequency comb as a light source. Our technique does not require any diffractive or dispersive optical elements and hence preserve the Jacquinot's-, Fellgett's-, and Connes'-advantages of FT spectrometers. The system supports a large optical bandwidth from visible to THz frequencies. The combination of a rotational delay line with collimated coherent or non-coherent light sources pave the way for FT spectrometers in applications where high speed, large optical bandwidth, and high spectral resolution are desired.

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Section: Discussionmentioning

confidence: 99%