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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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...
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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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).
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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...

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Related Experiment Video

Updated: Jun 4, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Grating-cavity continuous-wave optical parametric oscillators for high-resolution mid-infrared spectroscopy.

Markku Vainio1, Mikael Siltanen, Jari Peltola

  • 1Department of Chemistry, University of Helsinki, Helsinki, Finland.

Applied Optics
|February 2, 2011
PubMed
Summary

Grating-cavity continuous-wave optical parametric oscillators (cw OPOs) offer improved wavelength tuning and stability for high-resolution spectroscopy. This study details designs using diffraction and Bragg gratings for precise molecular fingerprint region analysis.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Laser Physics

Background:

  • Continuous-wave optical parametric oscillators (cw OPOs) are crucial for tunable laser sources.
  • Improving wavelength tuning and stability in cw OPOs is essential for high-resolution spectroscopy.
  • The molecular fingerprint region (around 3μm) is vital for chemical analysis.

Purpose of the Study:

  • To present designs for grating-cavity cw OPOs for high-resolution spectroscopy.
  • To demonstrate the application of these OPOs in the molecular fingerprint region.
  • To introduce a balanced detection scheme for enhanced signal-to-noise ratio.

Main Methods:

  • Utilizing metal-coated diffraction gratings for fast, broad tuning and high stability.
  • Employing bulk Bragg gratings for high optical power and spectral purity.
  • Developing and applying a new Bragg-grating OPO for Doppler-free absorption spectroscopy of methane (CH4).
  • Implementing a balanced detection scheme to mitigate intensity noise.

Main Results:

  • A metal-coated diffraction grating design achieved fast, broad wavelength tuning and high stability.
  • A Bragg-grating OPO demonstrated high optical power and good spectral purity.
  • Successful Doppler-free absorption spectroscopy of CH4 at approximately 3.22μm was performed.
  • The balanced detection scheme showed potential for improving signal-to-noise ratios in mid-infrared OPO measurements.

Conclusions:

  • Grating-cavity designs significantly enhance cw OPO performance for spectroscopy.
  • Bragg-grating OPOs are suitable for high-power, spectrally pure applications.
  • The developed OPO and detection scheme advance capabilities in molecular spectroscopy.