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Laser and optics Interface Column

Current and Emerging Laser Sensors for Greenhouse Gas Detection and Monitoring

July 1, 2014

In the study of global warming, obtaining good data demands widely deployed, accurate, and reliable sensors for identifying and understanding the origins, sources, and fates of greenhouse gases. Sensing technologies based on tunable diode laser absorption spectroscopy are starting to provide some of this critical data.

LIBS Basics, Part II: Hardware

April 1, 2014

The choices for LIBS hardware are discussed in detail, particularly lasers and spectrometers, and the trade-offs between cost, size, and performance are illustrated.

LIBS Basics, Part I: Measurement Physics and Implementation

January 1, 2014

An overview for those considering implementation of LIBS to solve a particular analytical problem, and an introduction for those interested in learning more about LIBS. Part I concentrates on the basics of the measurement and typical implementation.

Femtosecond Pulse Shaping Enables Rapid Two-Dimensional Infrared Spectroscopy

July 1, 2013

Here, Martin Zanni explains two dimensional (2D) infrared spectroscopy, the role of lasers, and current applications, such as studying the kinetics of protein aggregation in diabetes.

Quantum Cascade Lasers for Infrared Spectroscopy: Theory, State of the Art, and Applications

April 1, 2013

Mid-infrared quantum cascade lasers, recently developed and commercialized, have unique properties that advance the analytical capabilities of IR spectroscopy in many ways. Bernhard Lendl of Vienna University of Technology in Austria explains these developments.

Femtosecond vs. Nanosecond Laser Pulse Duration for Laser Ablation Chemical Analysis

January 1, 2013

Although the choice of laser is still highly dependent on the application requirements, there are distinct fundamental effects attributed to the laser pulse duration that drive the ablation sampling process. Here, we explain the differences between nanosecond and femtosecond laser ablation.

High-Resolution Raman Spectroscopy with Optically Pumped Semiconductor Lasers

July 1, 2012

A report on first results of the successful application of optically pumped semiconductor lasers in Raman spectroscopy of condensed-phase samples

Advantages of High-Brightness Lasers in Confocal Raman Spectroscopy

April 1, 2012

The theoretical and experimental differences between high-brightness and low-brightness lasers used in a dispersive confocal Raman microscope system are compared.

Tracking Unknown Intracellular Activity with Fluorescence Correlation Spectroscopy

January 1, 2012

The basic techniques of fluorescence correlation spectroscopy (FCS) are discussed as well as several applications, such as nanoparticle dispersion studies.

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