Laser systems and temperature control systems are comprised of discrete components. While the components (laser, laser driver, temperature controller, power supply, etc.) themselves produce noise that can add to the instability of the design, the connections between these components can contribute to the overall noise as well. Optimizing these component connections will maximize performance and reduce noise levels.

This Application Note discusses a variety of factors related to cabling optimization, including: leakage resistance, triboelectric and piezoelectric effects, shielding, insulation, grounding, length, and twisting.

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Researchers from China have developed a laser absorption spectrometer for high precision ammonia gas detection in livestock and poultry housing. Two different techniques are discussed: Open path laser absorption spectroscopy (OPLAS) and tunable diode laser absorption spectroscopy (TDLAS). Both of these detection setups provide theoretical basis and technical support for precision air quality detection and control.

Laser stability is critical for sensing low concentrations of harmful gases in the air. Wavelength’s low noise laser diode driver, the WLD3343, enabled the sensitive measurements and analysis for ammonia gas detection in livestock housing.

The WTC3243 ultrastable temperature controller helped narrow linewidth and ensure stable wavelength for improved laser diode control and laser heatsink temperature.

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Detecting biomolecules, such as proteins or cells, with precision and high sensitivity is labor intensive with traditional assay devices. Researchers from the United Kingdom have developed a virus laser for rapid biomolecular detection with the precision of commercial systems.
Constant current and stable wavelength is a critical part of the laser emission with the virus. Modulation was also a key method to lower the cost of the experiment while avoiding expensive pulsed laser diodes. The modulation of the laser current was directed through Wavelength Electronics’ WLD3343 Laser Diode Driver, and the modulated signal was output to the laser diode.

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In this interview, Wavelength Electronics Inc. joins Kevin Repasky, Ph.D., Assistant Professor at Montana State University, a previous researcher of Raman scattering. Raman scattering and Raman spectroscopy are explained with critical parameters and components explored. Stable control of a laser diode, whether as the light source or pump laser, is crucial in establishing stable wavelength and reduced electrical and optical noise. Within a wide variety of applications, Raman spectroscopy can provide molecular “fingerprints” based on vibrational or rotational modes of the molecule.

Read the Interview.

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