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Laser Diodes by Package & TypeThorlabs' extensive selection of laser diodes includes Fabry-Pérot and Fiber Bragg Grating (FBG) Lasers, as well as Single-Frequency Lasers (SFL) with Distributed Bragg Reflector (DBR), Distributed Feedback (DFB), Volume Holographic Grating (VHG), External Cavity (ECL), and Ultra Low Noise (ULN) designs. For those working in the Mid-IR, we also offer an extensive collection of Quantum Cascade Lasers (QCLs) and Interband Cascade Lasers (ICLs). Our laser diodes are available in multiple package styles including standard Ø5.6 mm or Ø9 mm TO can, fiber-pigtailed TO can, butterfly, extended butterfly, C-mount, D-mount, high heat load (HHL), and chip on submount. The Laser Diode Selection Guide lists all laser diodes available from stock along with key specifications.