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Laser diodes (LDs) are semiconductor devices that emit coherent light through stimulated emission. Laser modules integrate LDs with optical components, drivers, and thermal management systems. These devices are critical in telecommunications, medical systems, industrial processing, and consumer electronics due to their high efficiency, compact size, and precise beam control.
| Type | Functional Features | Application Examples |
|---|---|---|
| Edge-Emitting Laser Diodes | High power output, narrow spectral width | Fiber optic communication, LIDAR |
| Vertical-Cavity Surface-Emitting Lasers (VCSELs) | Low divergence beam, array scalability | 3D sensing, data centers |
| Quantum Cascade Lasers | Tunable mid-infrared emission | Gas sensing, spectroscopy |
| Fiber-Coupled Laser Modules | Integrated beam shaping, wavelength stabilization | Material processing, medical surgery |
| Multi-Transverse Mode Lasers | High brightness, multimode output | Laser projection, defense systems |
Laser Diodes: Composed of an active region (quantum well structure), cladding layers, and a resonant cavity formed by cleaved facets. Electrical contacts enable current injection.
Laser Modules: Integrate LDs with:
| Parameter | Description | Importance |
|---|---|---|
| Wavelength (nm) | Emission spectrum peak | Determines material compatibility and application suitability |
| Output Power (mW/W) | Optical power level | Critical for processing speed and transmission distance |
| Wall-Plug Efficiency (%) | Electrical-to-optical conversion rate | Affects thermal management and power consumption |
| Beam Quality (M ) | Deviatoin from ideal Gaussian beam | Impacts focusing precision and coupling efficiency |
| Lifetime (hours) | Mean time before power 10% | System reliability and maintenance intervals |
Telecommunications: DWDM systems, free-space optical links
Medical: Laser scalpels, photodynamic therapy devices
Industrial: Cutting/welding machines, 3D printers
Consumer Electronics: LiDAR for AR/VR, facial recognition systems
Scientific: Atomic clocks, quantum computing research
| Manufacturer | Representative Product | Key Features |
|---|---|---|
| Lumentum | LD-XX-Y Series | 1550nm wavelength, 100mW output, telecom-grade reliability |
| IPG Photonics | LM-ABC-10W | Single-mode fiber delivery, 10W output at 976nm |
| Coherent | OBIS Flexx Series | Tunable visible/near-IR output, integrated control |
| Hamamatsu Photonics | L8612 Series | Pulsed VCSEL with 940nm peak wavelength |
Key considerations:
Emerging developments include: