Deeper Dive into Distributed Feedback Lasers
Some DFB Laser Applications
Some popular DFB laser applications include various forms of gas sensing (e.g., molecular spectroscopy, TDLAS or tunable diode laser absorption spectroscopy), interferometry, fiber sensing, fiber optic communication, LIDAR, DIAL, and night vision applications.
Laser Diodes for Gas Sensing: Mode-Hop-Free Tunability with High SMSR
In a hypothetically perfect laser, all of the laser power produced would be contained within the main spectral peak. However, in reality, the power distribution is not as ideal and the side peaks or side modes of the laser profile contain some percentage of the total output power. A Distributed Feedback (DFB) laser’s side-mode suppression ratio (SMSR) is a value that explains the amplitude delta between the main mode and the most significant side mode in decibel units (noise ratio). A typical SMSR value would be greater than 30dB, which indicates that most of the power resides in the main spectral peak. High-quality, high-performance DFB laser diodes boast even higher SMSR values, and thus generate a greater ratio of total power within the main mode, compared to the side modes.
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Groundbreaking New QCL Wavelength Range from 10µm to 17µm!
A new class of Distributed Feedback (DFB) QCLs has been developed at the University of Montpellier, France, in a joint laboratory with CNRS. The unique aspect is the use of different III-V semiconductor materials to fabricate the active region of the lasers. These materials are part of the antimonide family, a specialty of the University of Montpellier for decades. The foundation of QCLs consists of artificial heterostructure alternating nanometer-scale quantum wells and barrier layers. While the standard QCL uses InGaAs and AlInAs on an InP substrate – the basis of the optoelectronics telecom industry – this novel QCL technology is based on InAs and AlSb. These materials’ specific properties enabled the expansion of QCL wavelength range from 2.6µm to 25µm [1, 2]. High-performance laser sources have been demonstrated recently in the range 10 to 20µm [3-5], with powers in the milliwatts range emitted at room temperature in a continuous wave. An efficient DFB process was also demonstrated for the fabrication of single-frequency tunable lasers suitable for spectroscopy applications 
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With over 25 years experience providing distributed feedback DFB lasers to researchers and OEM integrators working in various markets and applications, and 1000s of units fielded, we have the experience to ensure you get the right product for the application. Working with RPMC ensures you are getting trusted advice from our knowledgeable and technical staff on a wide range of laser products. RPMC and our manufacturers are willing and able to provide custom solutions for your unique application.
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