| 1 | Low-Power Visible Alignment Diode | 405–660 nm | 0.5–5 mW | 1.2–2.0 | Class 2 or 3R | Visible output may activate the aversion response, but direct or magnified viewing remains hazardous. Short wavelength operation can increase photochemical retinal concerns. | Alignment tools, optical sensors, barcode systems, and laboratory indicators |
| 2 | Low-Power VCSEL | 650–980 nm | 0.5–10 mW | 1.1–1.5; near-circular output | Class 1, 2, or 3R | Compact vertical-cavity construction provides low divergence and excellent circularity. Invisible near-infrared versions do not trigger a reliable blink response. | Short-range optical sensing, distance measurement, gesture detection, and data links |
| 3 | Single-Mode Ridge-Waveguide Diode | 630–1550 nm | 5–100 mW | 1.1–1.5 | Class 2, 3R, or 3B | Offers a clean fundamental transverse mode and low beam divergence. At wavelengths above approximately 1400 nm, corneal absorption changes the dominant exposure hazard. | Precision instruments, spectroscopy, interferometry, optical measurement, and fiber coupling |
| 4 | Distributed-Feedback (DFB) Laser Diode | 1260–1650 nm | 5–100 mW | 1.1–1.5 | Class 1, 3R, or 3B | A built-in grating provides narrow linewidth and stable single-frequency operation. Near-infrared emissions can be difficult to see while still presenting an eye hazard. | Fiber-optic communications, coherent sensing, gas monitoring, and precision metrology |
| 5 | Distributed-Bragg-Reflector (DBR) Diode | 760–1650 nm | 10–200 mW | 1.2–2.0 | Class 3R or 3B | Provides wavelength selectivity and good spectral stability, often with tunability through current or temperature control. Direct viewing is unsafe at typical operating powers. | High-resolution spectroscopy, fiber sensing, lidar, and coherent optical systems |
| 6 | Multimode Fabry–Pérot Edge-Emitting Diode | 635–1060 nm | 50–500 mW | 2–10 | Class 3B | Broad gain bandwidth and multiple longitudinal modes make this design economical and robust, but its elliptical beam is less suitable for high-quality focusing. | Industrial sensors, optical storage, illumination modules, and basic fiber transmission |
| 7 | Blue-Violet GaN-Based Laser Diode | 405–460 nm | 5–500 mW | 1.2–3.0 | Class 3R or 3B | Short-wavelength visible output is readily scattered by the eye and can present significant retinal and photochemical risks. Beam shaping is commonly required. | Fluorescence excitation, optical inspection, measurement systems, and high-density optical storage |
| 8 | Quantum-Cascade Laser Diode | 3–12 µm | 10 mW–2 W | 1.5–5 | Class 3B or 4 | Mid-infrared radiation is generally invisible and may cause corneal or skin injury depending on wavelength and exposure. Thermal management is critical. | Trace-gas analysis, environmental monitoring, infrared spectroscopy, and chemical detection |
| 9 | Tapered Laser Diode and Tapered Amplifier | 760–1100 nm; selected bands near 1.3–1.6 µm | 0.5–5 W | 1.2–3.0 in the slow axis; higher in the fast axis | Class 3B or 4 | Combines a single-mode input with a flared gain section to increase power while preserving relatively good spatial quality. Interlocks and beam enclosures are normally required. | Scientific instrumentation, nonlinear optics, optical pumping, and free-space communications |
| 10 | Broad-Area High-Power Diode, Bar, or Stack | 780–1060 nm; specialized bands also available | 1 W–1 kW | Approximately 5–40, depending on emitter and stacking | Class 4 | Highest typical optical output in this comparison. Direct, reflected, and diffuse exposure can cause severe eye or skin injury and may create fire hazards. | Material processing, pumping of solid-state lasers, thermal treatment, welding, and industrial illumination |
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