We present high-resolution spectroscopy of I(2) vapor that is loaded and trapped within the core of a hollow-core photonic crystal fiber (HC-PCF). We compare the observed spectroscopic features to those observed in a conventional iodine cell and show that the saturation characteristics differ significantly. Despite the confined geometry it was still possible to obtain sub-Doppler features with a spectral width of ~6 MHz with very high contrast. We provide a simple theory which closely reproduces all the key observations of the experiment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.20.011906 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Investigation of the Impact of Thionine Functionalization on Magnetoelastic Sensor Performance.
ACS Appl Bio Mater
January 2025
Physics Department, Federal University of Viçosa, Viçosa, Minas Gerais 36570-900, Brazil.
This study investigates the functionalization of gold-coated magnetoelastic sensors with thionine molecules, focusing on resonance frequency shifts. The functionalization process was characterized by using Raman spectroscopy and analyzed via scanning electron microscopy and atomic force microscopy, revealing the progressive formation of molecular clusters over time. Our results demonstrate that longer functionalization time leads to saturation of surface coverage and cluster formation, impacting the sensor's resonance frequency shifts.
View Article and Find Full Text PDFEnhancing spectral imaging with multi-condition image fusion.
Sci Rep
January 2025
Centre for Applied Photonics, INESC TEC, Rua do Campo Alegre 687, 4169-007, Porto, Portugal.
Spectral Imaging techniques such as Laser-induced Breakdown Spectroscopy (LIBS) and Raman Spectroscopy (RS) enable the localized acquisition of spectral data, providing insights into the presence, quantity, and spatial distribution of chemical elements or molecules within a sample. This significantly expands the accessible information compared to conventional imaging approaches such as machine vision. However, despite its potential, spectral imaging also faces specific challenges depending on the limitations of the spectroscopy technique used, such as signal saturation, matrix interferences, fluorescence, or background emission.
View Article and Find Full Text PDFPhysiological and cerebral hemodynamic changes during routine nursing procedures for very preterm infants.
Arch Pediatr
January 2025
Institut des Neurosciences Cellulaires et Intégratives, CNRS UPR 3212 / Université de Strasbourg, Strasbourg, France; CHU Strasbourg, Médecine et Réanimation du nouveau-né, Service de Pédiatrie 2, Pôle médico chirurgical Pédiatrique de Hautepierre, Avenue Molière, 67091 Strasbourg, FR, France.
Background: Care procedures for preterm infants can induce stress that may disrupt homeostasis, possibly altering cerebral perfusion or oxygenation. We evaluated the physiological and cerebral oxygenation changes during the routine care of very preterm infants.
Methods: We analyzed the changes in heart and respiratory rates and in systemic and regional cerebral oxygen saturation of 27 very preterm infants, defining three care periods of 5 min each: 30 min before care, 30 min during care, and 30 min after care.
Monitoring of perioperative tissue perfusion and impact on patient outcomes.
J Cardiothorac Surg
January 2025
Department of Anesthesiology, Zhongda hospital, Southeast University, No. 87 Dingjiaqiao, Nanjing City, 210009, Jiangsu Province, China.
Monitoring perioperative tissue perfusion is crucial in clinical anesthesia to protect organs and ensure patient safety. Indicators like hemodynamic parameters, tissue metabolism, and microcirculation markers are used for assessment. Studies show intraoperative hypotension negatively impacts outcomes, though blood pressure alone may not reflect tissue perfusion accurately.
View Article and Find Full Text PDFNew generation low level laser effect on masseter muscle oxygenation, bite force and algometric changes in myofacial pain syndrome: a randomised, placebo-controlled clinical trial.
Lasers Med Sci
January 2025
University of Zurich, Zurich, Switzerland.
The aim of this study was to compare the effectiveness of different types of low level laser treatment (LLLT) in reducing pain levels, changing oxygen saturation and bite force in patients with myofacial pain syndrome (MPS). 45 patients were randomly assigned to three groups: Group 1 (GRR laser, n = 15) received LLLT with Gallium-Aluminium-Arsenide (GaAlAs) diode laser with a wavelength of 904 nm and red laser with a wavelength of 650 nm over masseter muscle region. Group 2 (Nd: YAG laser, n = 15) were treated with Neodymium-doped Yttrium Aluminium Garnet laser with a wavelength of 1064 nm and the same protocol with Nd: YAG laser was performed in the Group 3 (placebo, n = 15) using sham device.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!