Distributed Feedback (DFB) Lasers
A Distributed Feedback Laser (DFB) refers to laser diodes or quantum cascade lasers (QCLs), for example, in which the surface of the active region or gain medium is etched with a periodic structure or diffraction grating (Bragg grating). This grating creates a one-dimensional interference grating, providing optical feedback. Essentially, this process allows only one wavelength to emit from the diode, rather than one center wavelength with a couple of lower power side wavelengths that you typically get from a standard Fabry-Perot laser diode. Distributed Feedback (DFB) Laser Diodes are single-frequency and offer a Narrow Linewidth with good side mode suppression ratio (SMSR).
Discreet-Mode (DM) Laser Diodes offer very similar performance to DFB Lasers. Discreet-Mode Laser Diodes are produced with a simple and low-cost fabrication process and have many advantages. For example, they have very high side mode suppression ratio, stable operation over a broad temperature range, narrow linewidth and low sensitivity to optical feedback.
Free-space and fiber pigtailed versions are available in these NIR, SWIR, & LWIR (from ≈1260nm to 16µm) narrow linewidth lasers, with up to 50mW output. Furthermore, packages include HHL, TO-Can, and fiber-coupled butterfly options. Finally, we offer a wide range of wavelengths and output powers to choose from in our DFB Lasers.
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