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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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...

UV–Vis Spectroscopy: Molecular Electronic Transitions

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...

UV–Vis Spectrum

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...

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Updated: Jul 8, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Narrow-band, tunable, semiconductor-laser-based source for deep-UV absorption spectroscopy.

D A Kliner, J P Koplow, L Goldberg

|January 12, 2008

Summary

Researchers generated tunable, narrow-bandwidth ~215-nm radiation using a pulsed Gallium Aluminum Arsenide (GaAlAs) amplifier. This method significantly improved conversion efficiency for detecting gases like nitric oxide.

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Last Updated: Jul 8, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: May 11, 2014

Area of Science:

Laser Physics
Spectroscopy
Chemical Sensing

Background:

High-power, tunable, narrow-bandwidth UV radiation is crucial for sensitive gas detection.
Previous methods for generating ~215-nm radiation often lacked efficiency or tunability.
Gallium Aluminum Arsenide (GaAlAs) tapered amplifiers offer high power but require efficient seeding and pulsing for UV generation.

Purpose of the Study:

To develop an efficient method for generating tunable, narrow-bandwidth ~215-nm radiation.
To investigate the impact of amplifier pulsing on conversion efficiency.
To demonstrate the utility of the generated radiation for high-resolution absorption spectroscopy of gases.

Main Methods:

Frequency quadrupling of ~860-nm output from a pulsed GaAlAs tapered amplifier.
Seeding the amplifier with an external-cavity diode laser for tunability.
Utilizing high-resolution absorption spectroscopy for gas detection.

Main Results:

Tunable, narrow-bandwidth (<200-MHz) ~215-nm radiation was successfully produced.
Pulsing the GaAlAs amplifier increased the 860 nm to 215 nm conversion efficiency by two orders of magnitude compared to continuous-wave (cw) operation.
Detection of nitric oxide (NO) and sulfur dioxide (SO2) was demonstrated with high resolution.

Conclusions:

Pulsed amplification of GaAlAs tapered lasers provides a highly efficient route to UV generation.
The developed system enables sensitive and selective detection of key atmospheric and industrial gases.
This technique holds promise for advancements in environmental monitoring and chemical analysis.