Vertical-external-cavity surface-emitting-laser

A vertical-external-cavity surface-emitting-laser (VECSEL) is a small semiconductor laser similar to a vertical-cavity surface-emitting laser (VCSEL). VECSELs are used primarily as near infrared devices in laser cooling and spectroscopy, but have also been explored for applications such as telecommunications.

Source: Wikipedia — Vertical-external-cavity surface-emitting-laser (CC BY-SA 4.0)