Laser Diodes, Laser Modules
1. What are Laser Diodes and Modules?
Laser Diodes
A semiconductor light-emitting device that achieves stimulated emission light amplification by injecting current (the principle is based on “Light Amplification by Stimulated Emission of Radiation”), with the characteristics of monochromaticity, directionality, and high coherence. Its internal structure includes components such as the laser emission part (LD) and the photodiode (PD).
Laser Modules
A functional module that integrates and packages laser diodes, optical components (such as lenses, crystals), drive circuits, heat dissipation devices, etc., used to provide stable and controllable laser output.
2. What are the Core Principles of Laser Diodes and Modules?
Laser Diode: When current passes through the P-N junction, electrons and holes recombine to generate photons, which are amplified by light in the resonant cavity through a reflector and finally output laser.
Laser Module: Add optical shaping (such as DOE lens), temperature control, electrostatic protection (such as LASORB element), and other functions on the basis of the diode to optimize the beam quality and reliability.
3. What are the Key Parameters of Laser Diodes and Modules?
Laser Diode: operating wavelength (380nm–1600nm), output power (5mW–5W), threshold current, beam divergence angle, etc.
Laser Module: spot shape (such as circular/linear), coupling efficiency (fiber module), operating temperature range, protection level (such as fully enclosed design), etc.
4. What are the Main Types of Laser Diodes and Modules?
1) Classification by Structure
Edge-emitting laser diode: traditional type, the beam is emitted parallel to the semiconductor surface.
Surface-emitting laser diode (VCSEL): the beam is emitted perpendicular to the surface, suitable for high-density integration.
2) Classification by Module Function
DPSS module: wavelength conversion through the crystal, used for high-power laser output.
Fiber coupling module: couples the beam to the optical fiber to achieve flexible transmission and high beam quality.
5. Where are Laser Diodes and Modules Used?
Industrial Field: laser cutting/welding, 3D printing, precision measurement (such as distance measurement, and barcode scanning).
Consumer Electronics: laser projection, virtual reality (VR) display, optical storage.
Communication and Medical: optical fiber communication, medical detection/treatment equipment (such as laser surgery).
6. What is the Development Trend of Laser Diodes and Modules?
High-efficiency Integration: modules are developing towards miniaturization and low power consumption, integrating intelligent temperature control and drive circuits.
Multi-wavelength Extension: development of ultraviolet to far infrared band products to meet special application requirements (such as quantum technology).
High Power and High Reliability: output power is increased through multi-tube beam combining technology while optimizing anti-ESD design to extend life.