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IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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...

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Related Experiment Video

Updated: May 14, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-P&#233;rot Etalon
07:22

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

An autocorrelator based on a Fabry-Perot interferometer.

Jungkwuen An1, Kyungsuk Pyun, Ojoon Kwon

  • 1Material and Device Laboratory, Samsung Advanced Institute of Technology, Giheung-gu, Yongin-si, Gyeonggi-do, South Korea.

Optics Express
|February 8, 2013
PubMed
Summary

A novel autocorrelator using a Fabry-Perot interferometer simplifies ultrashort pulse measurement. This design offers a more compact and easily aligned setup compared to traditional Michelson interferometer autocorrelators.

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Last Updated: May 14, 2026

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Published on: February 3, 2023

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Area of Science:

  • Optics and Photonics
  • Ultrafast Laser Science
  • Interferometry

Background:

  • Accurate measurement of ultrashort optical pulses is crucial for various scientific and technological applications.
  • Conventional autocorrelators, often based on Michelson interferometers, can be complex to align and bulky.
  • Exploring alternative interferometer designs can lead to more practical and efficient pulse measurement techniques.

Purpose of the Study:

  • To propose and investigate a new autocorrelator design based on a Fabry-Perot interferometer for ultrashort pulse measurement.
  • To analyze the main features of this Fabry-Perot based autocorrelator, particularly those arising from the superposition of multiple pulses.
  • To compare the performance and practicality of the proposed autocorrelator with conventional Michelson interferometer-based systems.

Main Methods:

  • Theoretical modeling of pulse propagation and interference within a Fabry-Perot interferometer.
  • Experimental setup and characterization of the Fabry-Perot interferometer as an autocorrelator.
  • Investigation of signal generation and analysis due to multiple pulse superposition.
  • Comparative analysis of alignment ease and setup compactness against Michelson interferometer autocorrelators.

Main Results:

  • The signal generated by a Fabry-Perot interferometer can effectively serve as an autocorrelator signal for ultrashort pulses.
  • Experimental and theoretical investigations confirmed the feasibility and characteristics of the proposed design.
  • The Fabry-Perot autocorrelator demonstrated a significantly more compact physical setup.
  • Alignment procedures for the Fabry-Perot autocorrelator were found to be considerably simpler.

Conclusions:

  • A Fabry-Perot interferometer is a viable and effective component for constructing autocorrelators for ultrashort pulse measurement.
  • The proposed Fabry-Perot autocorrelator offers significant advantages in terms of compactness and ease of alignment over traditional methods.
  • This development paves the way for more accessible and user-friendly ultrashort pulse characterization techniques.