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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Updated: May 20, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements.

Kristen M Parzuchowski1,2,3, Michael D Mazurek3,2, Charles H Camp4

  • 1JILA, University of Colorado Boulder, Boulder, Colorado 80309, United States.

ACS Photonics
|March 24, 2025
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Summary
This summary is machine-generated.

We developed a new fiber platform for enhanced two-photon absorption measurements. This method significantly improves sensitivity for detecting classical and entangled two-photon absorption (C2PA and E2PA) processes.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Spectroscopy

Background:

  • Two-photon absorption (TPA) is crucial for various applications.
  • Entangled two-photon absorption (E2PA) offers potential quantum advantages but is challenging to measure.
  • Recent studies suggest smaller E2PA cross-sections than previously reported.

Purpose of the Study:

  • To develop a highly sensitive platform for TPA measurements.
  • To investigate the feasibility of measuring E2PA in a low-photon-flux regime.
  • To set experimental bounds on E2PA cross-sections.

Main Methods:

  • A toluene-filled hollow-core fiber was used to confine light and sample.
  • Classical two-photon absorption (C2PA) was measured with ultra-low laser power (1.75 nW).
  • The first waveguide-based measurement of E2PA was performed.

Main Results:

  • Achieved a 45-fold improvement in sensitivity for C2PA compared to free-space methods.
  • Observed no evidence of E2PA within the experimental setup.
  • Established an upper bound for the E2PA cross-section consistent with recent findings.

Conclusions:

  • The fiber platform significantly enhances sensitivity for nonlinear optical measurements.
  • Current experimental conditions do not support the observation of E2PA.
  • The findings constrain E2PA cross-sections, impacting the understanding of quantum advantages in TPA.