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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Coupled-cavity ring-down spectroscopy technique.

Jérémie Courtois1, Joseph T Hodges

  • 1National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Optics Letters
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

Coupled-cavity ring-down spectroscopy (CC-RDS) enhances optical resonator finesse. This technique improves spectrometer sensitivity and broadens the usable spectral range for high-reflectivity mirrors.

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Area of Science:

  • Optical Physics
  • Spectroscopy

Background:

  • Optical resonators are crucial components in various spectroscopic applications.
  • Controlling resonator finesse is key to enhancing sensitivity and dynamic range.

Purpose of the Study:

  • To introduce and demonstrate a novel technique, coupled-cavity ring-down spectroscopy (CC-RDS), for controlling optical resonator finesse.
  • To explore the applications of CC-RDS in extending spectrometer performance and mirror spectral range.

Main Methods:

  • CC-RDS employs controlled feedback of a probe laser beam into a ring-down cavity.
  • Interference is generated between circulating light and feedback light through a cavity mirror port.
  • Experiments utilized a 74 cm ring-down cavity and a feedback cavity with a finesse of 16.

Main Results:

  • The technique increased the decay time constant from 210 μs to 280 μs.
  • This corresponds to an increase in finesse from 2.7×10^5 to 3.6×10^5.
  • Using a second feedback cavity achieved ring-down times of ~0.5 ms, equivalent to (1-R)≈4.9×10^-6.

Conclusions:

  • CC-RDS effectively controls optical resonator finesse.
  • The method offers significant improvements for cavity-enhanced spectrometers and high-reflectivity mirrors.
  • Further enhancement of ring-down times was demonstrated with additional feedback cavities.