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Laser Diodes by Package & TypeThorlabs' laser diodes are available in a wide variety of packages: TO can sizes from Ø3.8 mm to Ø9.5 mm, fiber-pigtailed TO cans, butterfly, extended butterfly, C-mount, D-mount, high heat load (HHL), and chip on submount. Our extensive selection 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 Quantum Cascade Lasers (QCLs) and Interband Cascade Lasers (ICLs). The Laser Diode Selection Guide lists all laser diodes available from stock along with key specifications.