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Related Concept Videos

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...

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Related Experiment Video

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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Widely tunable mid-IR difference-frequency generation based on fiber lasers.

Jianhua Chang1, Qinghe Mao, Sujuan Feng

  • 1Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei, 230031, China.

Optics Letters
|October 23, 2010
PubMed
Summary

A new technique widens the tuning range for mid-infrared difference-frequency generation (DFG) using periodically poled lithium niobate (PPLN). This method leverages crystal temperature to create separate quasi-phase matching bands, achieving a 690nm idler tuning range.

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

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Last Updated: Jun 7, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Difference-frequency generation (DFG) is crucial for generating tunable mid-infrared (mid-IR) light.
  • Periodically poled lithium niobate (PPLN) is a key material for quasi-phase matching (QPM) in nonlinear optical processes.
  • Achieving wide tuning ranges in DFG systems remains a challenge for various applications.

Purpose of the Study:

  • To present a novel wide tuning technique for mid-IR DFG using uniform grating PPLN.
  • To explore the relationship between PPLN dispersion, crystal temperature, and QPM band splitting.
  • To experimentally demonstrate an enhanced idler tuning range using the proposed method.

Main Methods:

  • Utilizing the dispersion properties of PPLN to engineer separate QPM bands for the pump beam.
  • Adjusting the crystal temperature to control the spacing between these QPM bands.
  • Employing fiber laser fundamental lights as pump sources for DFG.

Main Results:

  • The QPM band for the pump was observed to split into two distinct bands.
  • Decreasing the crystal temperature increased the spacing between the two QPM bands.
  • An experimental idler tuning range of 690nm was successfully achieved.

Conclusions:

  • The presented technique effectively broadens the idler tuning range in mid-IR DFG.
  • Temperature-controlled QPM band splitting in PPLN offers a viable method for enhanced spectral coverage.
  • This approach has significant implications for spectroscopic and sensing applications requiring tunable mid-IR sources.