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Sensitive Laser Spectroscopy

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A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 1886

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Dr. Gang Zhao

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Guest Editor

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan, China
Interests: laser absorption spectroscopy; precision spectral measurement; laser frequency stabilization; mid-infrared laser technique; cavity enhanced

Special Issue Information

Dear Colleagues,

Laser spectroscopy has gained widespread recognition as a powerful tool for studying fundamental physical properties, detecting trace matter, and analyzing molecular structures, among other applications. A wide range of spectroscopic instruments, particularly those developed for analytical purposes, have been created and utilized in various fields. Detection sensitivity stands as a crucial indicator for spectrometers, and it has been improved through various strategies. These strategies include enhancing spectroscopic information, suppressing systematic noise, or employing post-processing algorithms to separate the desired information from the noise. However, as demand continues to rise, there is a growing need for spectrometers with even greater detection sensitivity.

To promote academic research and development in the field of sensitive laser spectroscopy and strengthen academic exchanges and cooperation among relevant researchers, Photonics will launch a Special Issue titled "Sensitive Laser Spectroscopy", which will focus on displaying and discussing research achievements and research progress in the field of laser spectroscopy and its applications.

Dr. Gang Zhao
Guest Editor

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Published Papers (3 papers)

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Research

15 pages, 4060 KiB

Open AccessArticle

Sensitive Detection of Silicon in Aqua Phase by Microwave-Assisted Laser-Induced Breakdown Spectroscopy

by Ali M. Alamri and Zeyad T. Alwahabi

Photonics 2024, 11(4), 380; https://doi.org/10.3390/photonics11040380 - 17 Apr 2024

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Abstract

Microwave-assisted laser-induced breakdown spectroscopy (MA-LIBS) was demonstrated to be an effective method for the quantitative detection of silicon in the aqua phase. Microwave radiation was transmitted into plasma using a near-field applicator device under ambient pressure and temperature conditions. Silicon detection was performed directly on the surface of a water jet. Two Si emission lines, 251.6 nm and 288.16 nm, were selected to evaluate the MA-LIBS enhancement and determine the limit of detection for silicon. The signal-to-noise ratio of the MA-LIBS spectra was investigated as a function of laser energy and microwave power. The calibration curve was established for Si quantitative analysis using 8 mJ of laser energy and 900 W of microwave power. The MA-LIBS recorded a 51-fold and 77-fold enhancement for Si I 251.6 nm and 288.16 nm, respectively. Reducing liquid splashes after laser ablation is essential to improving the quantitative analysis. Using MA-LIBS reduced the liquid splashes due to MA-LIBS using 8 mJ. The detection limit achieved was 1.25, a 16-fold improvement over traditional LIBS. Full article

(This article belongs to the Special Issue Sensitive Laser Spectroscopy)

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16 pages, 2411 KiB

Open AccessArticle

Broadband High-Precision Faraday Rotation Spectroscopy with Uniaxial Single Crystal CeF₃ Modulator

by John H. Lacy, Gabriel E. Patenotte, Abby C. Kinney and Protik K. Majumder

Photonics 2024, 11(4), 304; https://doi.org/10.3390/photonics11040304 - 26 Mar 2024

Viewed by 504

Abstract

We present a low-noise (<10 µ

rad / \sqrt{Hz}

We present a low-noise (<10 µ

rad / \sqrt{Hz}

) broadband Faraday Rotation Spectroscopy method which is feasible for near-ultraviolet through near-infrared wavelengths. We demonstrate this in the context of a high-precision spectroscopy experiment using a heated Pb vapor cell and two different lasers, one in the UV (368 nm) and a second in the IR (1279 nm). A key element of the experimental technique is the use of a uniaxial single crystal CeF₃ Faraday modulator with excellent transmission and optical rotation properties across the aforementioned wavelength range. Polarimeter performance is assessed as a function of crystal orientation and alignment, AC modulation amplitude, laser power, and laser wavelength. Crystal-induced distortion of the

{(6 p^{2})}^{3} P_{0} \to {(6 p^{2})}^{3} P_{1}

(1279 nm) and

{(6 p^{2})}^{3} P_{1} \to {(6 p 7 s)}^{3} P_{0}

(368 nm) spectral lines due to misalignment-induced birefringence is discussed and modeled using the Jones calculus. Full article

(This article belongs to the Special Issue Sensitive Laser Spectroscopy)

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12 pages, 2378 KiB

Open AccessArticle

Comparison of Optogalvanic and Laser-Induced Fluorescence Spectroscopy

by Laurentius Windholz

Photonics 2024, 11(3), 279; https://doi.org/10.3390/photonics11030279 - 21 Mar 2024

Viewed by 660

Abstract

When investigating complex atomic spectra, it may happen accidentally that two or even several transitions between different pairs of combining energy levels have nearly the same wavenumber, and the observed spectral lines are overlapping (blend situations). In such cases, investigations of hyperfine structures can be very helpful in the identification of the involved transitions. In this paper, two complicated blend situations within the spectra of lanthanide atoms (Praseodymium and Lanthanum) are discussed as examples. The experimental methods applied are optogalvanic and laser-induced fluorescence spectroscopy, combined with emission spectra gained via Fourier transform spectroscopy. It is shown that, in such cases, a combination of optogalvanic and laser-induced fluorescence detection is necessary to find all transitions contributing to the observed spectral signatures. Full article

(This article belongs to the Special Issue Sensitive Laser Spectroscopy)

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