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Title: Optical heterodyne-enhanced chirped laser dispersion spectroscopy

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Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 14; Related Information: CHORUS Timestamp: 2017-07-10 11:24:58; Journal ID: ISSN 0146-9592
Optical Society of America
Country of Publication:
United States

Citation Formats

Plant, Genevieve, Chen, Yifeng, and Wysocki, Gerard. Optical heterodyne-enhanced chirped laser dispersion spectroscopy. United States: N. p., 2017. Web. doi:10.1364/OL.42.002770.
Plant, Genevieve, Chen, Yifeng, & Wysocki, Gerard. Optical heterodyne-enhanced chirped laser dispersion spectroscopy. United States. doi:10.1364/OL.42.002770.
Plant, Genevieve, Chen, Yifeng, and Wysocki, Gerard. 2017. "Optical heterodyne-enhanced chirped laser dispersion spectroscopy". United States. doi:10.1364/OL.42.002770.
title = {Optical heterodyne-enhanced chirped laser dispersion spectroscopy},
author = {Plant, Genevieve and Chen, Yifeng and Wysocki, Gerard},
abstractNote = {},
doi = {10.1364/OL.42.002770},
journal = {Optics Letters},
number = 14,
volume = 42,
place = {United States},
year = 2017,
month = 7

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 11, 2018
Publisher's Accepted Manuscript

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  • Chirped laser dispersion spectroscopy (CLaDS) utilizing direct modulation of a quantum cascade laser (QCL) is presented. By controlling the laser bias nearly single- and dual-sideband CLaDS operation can be realized in an extremely simplified optical setup with no external optical modulators. Capability of direct single-sideband modulation is a unique feature of QCLs that exhibit a low linewidth enhancement factor. The developed analytical model shows excellent agreement with the experimental, directly modulated CLaDS spectra. This method overcomes major technical limitations of mid-infrared CLaDS systems by allowing significantly higher modulation frequencies and eliminating optical fringes introduced by external modulators.
  • A scheme is proposed for coherent detection and real time Fourier processing of optical signals. In this scheme an input signal is photomixed at one photodetector with a variable (chirped) frequency output of a tunable diode last (TDL). Part of the TDL radiation is photomixed at a second photodetector with a fixed frequency output of a stable laser. The electrical signals from the two detectors are convolved by a surface scoustic wave convolver. After proper filtering and envelope detection, the convolver output can be shown to give the power spectrum of the input signal. This scheme may be used formore » spectroscopy in the infrared.« less
  • Based on the full two-dimensional characteristics of the quasi-phase-matched fan-out periodically poled crystal, a scalable and engineerable scheme for ultrabroadband optical parametric chirped-pulse amplification is proposed, which can significantly broaden the gain bandwidth by the spatial separation of different frequency components of the signal pulse and manipulation of the distribution of the pump beam along the fan-out direction of the crystal. The theoretical analysis shows that the signal pulse can be amplified with minimal spectrum narrowing, and the initial spectrum can be broadened considerably if needed. Based on this scheme, using a fan-out periodically poled 5% mol MgO-doped congruent lithiummore » niobate with a configuration of 5x0.5x5 mm{sup 3} and two pump beams, the 3.3-{mu}m middle-infrared ultrabroadband optical parametric chirped-pulse amplifier is designed. The numerical computation results confirm that the -3 dB gain bandwidth of this amplifier exceeds 320 nm and can be further broadened.« less
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