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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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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...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Published on: December 22, 2015

High-resolution optical spectrum characterization using optical channel estimation and spectrum stitching technique.

Chao Jin1, Yuan Bao, Zhaohui Li

  • 1Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

Optics Letters
|July 2, 2013
PubMed
Summary

A new technique offers high-resolution, wide-band characterization of optical components, combining spectrum stitching and channel estimation. This method precisely measures amplitude, phase, and polarization properties for advanced optical devices.

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Area of Science:

  • Optics and Photonics
  • Optical Metrology

Background:

  • Accurate characterization of optical components is crucial for advanced photonic systems.
  • Existing methods may lack the required resolution or bandwidth for complex optical devices.

Purpose of the Study:

  • To develop and demonstrate a novel technique for high-resolution, wide-band characterization of optical components.
  • To measure amplitude, phase responses, and polarization properties of optical elements.

Main Methods:

  • The technique integrates optical spectrum stitching with optical channel estimation.
  • It utilizes a narrow linewidth, wavelength-tunable laser source and 1024-point fast Fourier transform (FFT).

Main Results:

  • Achieved a frequency resolution of approximately 10 MHz.
  • Demonstrated an optical measurement range exceeding 250 GHz.
  • Successfully characterized two types of fiber Bragg grating based Fabry-Perot cavities with ultrafine structures.

Conclusions:

  • The proposed technique enables precise, wide-band characterization of optical component properties.
  • This method is suitable for analyzing complex optical structures like ultrafine Fabry-Perot cavities.
  • The achieved resolution and bandwidth advance optical metrology capabilities.