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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Frequency domain analysis for laser-locked cavity ringdown spectroscopy.

T K Boyson1, T G Spence, M E Calzada

  • 1School of Engineering and Information Technology, University College, The University of New South Wales, Canberra, ACT, Australia. tkboyson@gmail.com

Optics Express
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a faster Fourier-transform method for Continuous Wave Cavity Ringdown Spectroscopy (CWCRDS). The new technique offers comparable accuracy and precision to traditional methods, but is significantly faster.

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Area of Science:

  • Spectroscopy
  • Optical Physics
  • Signal Processing

Background:

  • Continuous Wave Cavity Ringdown Spectroscopy (CWCRDS) is a sensitive technique for gas analysis.
  • Traditional CWCRDS data analysis involves fitting single ringdown events, which can be time-consuming.
  • Existing methods may not fully leverage the information contained within the entire cavity waveform.

Purpose of the Study:

  • To develop a novel, faster signal processing method for laser-locked CWCRDS.
  • To improve the precision and speed of CWCRDS data analysis.
  • To explore an alternative analysis approach inspired by Cavity Attenuated Phase Shift Spectroscopy.

Main Methods:

  • Development of a Fourier-transform based signal processing technique.
  • Amplitude modulation of incident laser light.
  • Analysis of the entire optical cavity waveform, rather than individual ringdowns.
  • Comparison with Levenburg-Marquardt non-linear least squares fitting.

Main Results:

  • The proposed Fourier-transform method achieves comparable accuracy to traditional methods for typical CWCRDS noise levels.
  • The new method demonstrates comparable or higher precision compared to traditional fitting.
  • Analysis time is reduced by approximately 500-fold for the same number of data points.
  • The method allows flexible analysis of multiple ringdown waveform periods.

Conclusions:

  • The Fourier-transform method provides a significant speed enhancement for CWCRDS data analysis.
  • This approach offers a viable alternative for processing CWCRDS data, balancing speed and precision.
  • The flexibility in analyzing waveform periods allows for spectrometer-specific optimization.