Laser Diodes, Laser Modules

Part Number	Description / PDF	Quantity
STL81005Z IR (Infineon Technologies)	LOW POWER 1550 NM FP LASER	372
STL51007N IR (Infineon Technologies)	LOW POWER 1300 NM LASER	2
STM81004G IR (Infineon Technologies)	LASER DIODE, 1590NM	2
STL51005G IR (Infineon Technologies)	LOW POWER 1300 NM FP LASER	0
STH51004G IR (Infineon Technologies)	HIGH POWER 1300 NM FP LASER	2
LASERDISPLPL90AHPSA1 IR (Infineon Technologies)	LASER DIODE 905NM NONSTANDARD	0
STL51005N IR (Infineon Technologies)	LOW POWER 1300 NM FP LASER	70

Laser Diodes, Laser Modules

1. Overview

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.

2. Main Types and Functional Classification

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

3. Structure and Components

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:

Collimating optics and beam-shaping elements
Photodiode feedback for power stabilization
Thermoelectric coolers (TEC) for temperature control
Driver circuits with modulation capabilities

4. Key Technical Specifications

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

5. Application Fields

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

6. Leading Manufacturers & Products

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

7. Selection Guidelines

Key considerations:

Wavelength compatibility with target material/transmission medium
Required power stability over temperature variations
Modulation speed requirements for communication systems
Environmental factors (humidity, vibration, operating temperature)
Form factor constraints and cooling method availability

8. Industry Trends

Emerging developments include:

High-power single-mode fiber lasers for metal processing
VCSEL arrays with >50% wall-plug efficiency for LiDAR
Photonic integrated circuits combining LDs with modulators
UV and deep-IR emitting devices for advanced spectroscopy
AI-driven thermal management systems for extended lifetime