Laser Diodes, Laser Modules – Laser Delivery, Laser Fibers

1. Laser Diodes

1) Definition and Principle

Semiconductor lasers with current-carrying p-n junctions as gain media achieve stimulated emission through electrical pumping. Its light-emitting principle is based on the release of photons when electrons and holes recombine, and the formation of a highly coherent laser beam through reflection in the resonant cavity.

 

The main types include edge-emitting lasers (such as DFB, and DBR lasers) and surface-emitting lasers (such as VCSEL).

 

2) Key Features

Wavelength Range: covers ultraviolet to infrared (380nm-1600nm), such as 405nm (blue light), 650nm (red light), 808nm (infrared), etc.

 

Power Range: single tube power ranges from milliwatts (5mW) to watts (5W).

 

Advantages: high efficiency, small size, long life, but requires the use of optical systems to improve beam quality.

 

2. Laser Modules

1) Composition and Function

With LD as the core, it integrates optical lenses (such as DOE, and collimating lenses), structural parts, driving circuits, etc. to achieve spot shaping (such as points, lines, patterns) and stable output.

 

Example: The robot obstacle avoidance radar module uses an 808nm laser, integrated fiber output, and drive control module.

 

2) Application Fields

Industry: laser engraving, welding, ranging, 3D scanning, etc.

 

Consumer Electronics: laser pointers, projection display, stage lighting.

 

3. Laser Delivery & Laser Fibers

1) Fiber Coupling Technology

Couple the spatial light output by LD into the optical fiber to achieve flexible optical path transmission and improve the beam quality (such as circular spot, and high energy density).

 

Large core fiber can integrate multiple laser beams to increase energy, while single-mode fiber is suitable for high-precision demand scenarios.

 

2) ‌Typical Application Scenarios‌

‌Medical: Precision energy transmission in laser surgery and photodynamic therapy.

 

‌Communication: The 1310nm/1550nm band is used for the optical fiber communication signal source.

 

4. Technology Trends and Market

‌Integration: Development towards miniaturization and modularization, such as integrated fiber-coupled lasers.

 

‌Diversified Needs‌: Covering the entire band from ultraviolet to infrared, intelligent driving circuits (such as temperature compensation, and power feedback).