According to Memes Consulting, a laser diode is a kind of laser generator. Its working material is a semiconductor, which belongs to a solid-state laser. Most laser diodes are similar in structure to general diodes. Since the laser diode is working, the energy conversion process of electrons only involves two energy levels, and there is no energy loss caused by the indirect band gap, so the efficiency is relatively high. In addition to high efficiency, laser diodes also have the advantages of small size and long life, and the unit price of mass-produced products is less than $1.

At present, the main types of laser diodes are single heterojunction (SH), double heterojunction (DH), and quantum well (QW). Products on the market can provide various wavelengths from ultraviolet light to long-wave infrared light: the central wavelength is determined by device structure and semiconductor material. The following figure shows the main application areas of laser diodes.

Main application areas of laser diodes

The power output provided by a single laser transmitter can range from milliwatts to several watts. Each laser emitter can be used alone or combined into a laser diode bar for the optical pumping of solid-state lasers or integrated into a laser diode module to meet a variety of application needs. The figure below shows an example of a typical application of laser diode technology in 3D sensing and imaging, the widespread adoption of which will revolutionize the consumer electronics and automotive industries.

Typical Application Examples of Laser Diodes in 3D Sensing and Imaging

VCSEL Lasers: 3D Face Recognition and Emotion Recognition

Over the past three decades, the average power of laser diodes has grown exponentially, while their average price has dropped exponentially. Incredible advances in semiconductor laser technology have enabled the development of sub-kilowatt direct diode lasers (DDLs) and multi-kilowatt high-power direct diode lasers (HPDDLs). The dramatic improvement in beam quality makes DDL an important tool for metal processing. DDL and HPDDL are becoming major trends in global industrial manufacturing. Recent innovations are mainly the development of blue diode lasers for welding and 3D printing of copper materials.

Blue Diode Lasers: 3D Printing of Copper Materials

Laser Diode and Direct Diode Laser Market Analysis

The figure below shows IDTechEx's market forecast that by 2029, the global laser diode and direct diode laser market will reach $13.985 billion, of which the laser diode market will be $11.952 billion and the direct diode laser will be $2.033 billion.

2018-2029 Laser Diode Market Forecast

Direct diode laser market forecast from 2018 to 2029

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