Diode lasers can range from a few milliwatts to several hundred watts, depending on the type and application.

Typical Power Ranges

• Low-power diode lasers: Commonly used in laser pointers, barcode scanners, and optical drives, these devices typically output less than 5 mW to around 500 mW .
• Medium-power diode lasers: Used in medical devices, laser printing, and fiber-optic pumping, these can range from 0.5 W to 10 W .
• High-power diode lasers: Industrial and research applications, such as materials processing or pumping solid-state lasers, can reach 10 W to several hundred watts, with some systems exceeding 1 kW when multiple diode arrays are combined .

Factors Affecting Power

• Current and temperature: The optical power of a diode laser increases with forward current but decreases with higher junction temperatures, requiring more current to maintain the same output .
• Device structure: Single-emitter diodes typically max out around 12 W, while bars or multi-emitter modules can combine outputs to achieve higher powers .
• Continuous vs. pulsed operation: Continuous-wave (CW) lasers emit a steady beam, while pulsed lasers can achieve extremely high peak powers for short durations, even if the average power is moderate .

Safety Considerations

Laser power directly affects safety classification:

• Class 1–2: Low-power devices (<1 mW) safe for general use.
• Class 3B: Up to 500 mW, hazardous to eyes.
• Class 4: Above 500 mW, capable of causing eye and skin injury and igniting materials .

Summary

Diode laser power varies widely depending on design and application, from milliwatts for consumer devices to hundreds of watts for industrial and research systems. The choice of power should match the intended use, considering both performance and safety requirements .