- QCLs for Gas Sensing in the Mid-IR
- Optoelectronic Qualification: NASA Goddard
- Raman Spectroscopy: Complete Laser Control
- Telecomm Manufacturing
- Medical Lasers
- Portable Shifted Excitation Raman Difference Spectrometer For In-Situ Field Measurements
- Methane Detection Using Unmanned Aerial Systems
- Utilizing Quantum Dots to Label DNA
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Using Wavelength Electronics’ precision temperature controller and low noise Quantum Cascade Laser (QCL) driver, researchers at Princeton University developed a sensor that was designed around a QCL to simultaneously measure nitrous oxide (N2O) and carbon monoxide (CO). The sensor is compact and field-deployable, requiring much less power and having a much smaller footprint and mass than previous sensors, while increasing the accuracy of concentration measurements. The most accurate measurements were 0.15 parts-per-billion-by-volume (ppbv) for N2O and 0.36 ppbv for CO. These accuracies well exceed the requirement of 1 ppbv to be considered “high stability” in the field of atmospheric sensing.
The complete case study is available as CS-LDTC01.
NASA’s Goddard Space Flight Center supports scientific studies ranging from Earth Science to astrophysics through a variety of missions. Operating the Hubble Space Telescope allows images from the depths of space to be seen. Instruments aboard the Curiosity rover on Mars yield information pertinent to understanding the surface. Satellites under Goddard’s control study the moon, Earth, and sun. (See https://www.nasa.gov/content/goddard-missions-present)
Raman Spectroscopy: Complete Laser Control
In order to measure high resolution wave number shifts using Raman spectroscopy, the output of the laser needs to be stable. Providing up to 2.2A of current with 20 ppm stability, the WLD3343 delivers the well-defined current required for this application. Pairing the current source with the WTC3243 temperature controller (stability of 0.0009°C) ensures that the operating temperature of the laser stays consistent, minimizing the effect that temperature fluctuations have on laser output.
A bank of twenty-five PLD12.5K-CHs is used as a fiber splice test system during telecomm laser manufacturing.
Being able to join optical fibers with low loss is important in fiber optic communication. This involves careful cutting of the fibers, precise alignment of the fiber cores, and the fusing of these aligned cores. Fusion splicing is common when a permanent connection is required. In this technique, an electric arc is used to melt the ends of the fibers together. A splice loss estimate is measured by the splicer, by directing light through the cladding on one side and measuring the light leaking from the cladding on the other side.
Laser in situ keratomileusis (LASIK) is the most common procedure for corneal refractive surgery to correct myopia. A focused infrared laser using ultrafast pulses of 100-femtosecond duration is used to create the corneal flap. Adjacent pulses are scanned across the cornea in a controlled pattern without causing significant inflammation or damage to the surrounding tissue.
Shifted Excitation Raman Difference Spectroscopy (SERDS) is proven to minimize the effect of background noise, and reduce measurement time. Now it is moving from the lab to the field. Researchers from Leibniz-Institut für Höchstfrequenztechnik in Berlin present a handheld, highly precise SERDS probe that allows in-situ measurements of chlorophyll in apple leaves.
Read how the stability of the laser system, driven by four LDD400s and temperature controlled by an HTC1500, satisfied the resolution and size requirements of this application.
The complete case study is available as CS-LDTC02.
Researchers from the United States (Princeton University, American Aerospace Technologies) and Germany (Karlsruhe Institute of Technology) have developed a mid-infrared gas-sensing instrument that can be autonomously flown to measure methane levels at different locations and altitudes. To drive the GaSb laser, a Wavelength Electronics LDTC0520 was chosen, because it is small and lightweight enough to mount to a drone or hexacopter while providing the necessary precision.
The complete case study is available as CS-LDTC03.
By using a modified version of polymerase chain reaction (PCR), researchers from China’s Wuhan University were able to show that one-to-one labeling of DNA with quantum dots could be achieved. Using a Wavelength Electronics LFI3751 temperature controller, thermal testing was done to ensure the stability of the quantum dots during the drastic temperature fluctuations of PCR. This hyper-sensitive labeling scheme can be applied in biology, medicine, and nanomaterial fabrication.
The complete case study is available as CS-TC01.