VCSELsäteilylähteet

VCSELsäteilylähteet, short for Vertical-Cavity Surface-Emitting Lasers, are a type of semiconductor laser diode. Unlike traditional edge-emitting lasers, VCSELs emit light perpendicular to the surface of the semiconductor wafer. This unique emission pattern allows for wafer-level testing and easy integration into two-dimensional arrays, making them highly cost-effective for mass production.

The fundamental structure of a VCSEL consists of an active region sandwiched between two highly reflective mirrors. These mirrors are typically distributed Bragg reflectors (DBRs) made of alternating layers of different refractive index materials. The cavity formed between these mirrors allows for laser oscillation when sufficient current is passed through the active region.

VCSELs offer several advantages, including low threshold current, circular and low-divergence output beam, and ease of manufacturing. They are also highly reliable and can be modulated at very high speeds. These characteristics make them suitable for a wide range of applications.

Common applications for VCSELs include optical data communication, particularly in short-range links like within data centers and for Ethernet connections. They are also used in 3D sensing technologies, such as those found in smartphones for facial recognition and in augmented reality devices. Other uses include proximity sensing, laser printing, and automotive applications. The ongoing development of VCSEL technology continues to expand their potential uses in various fields.