21. Uses of laser diodes can be categorized in various ways. 22. In 1984, Pioneer Corporation introduced the first consumer player with a solid-state laser diode . 23. Such a design is called a separate confinement heterostructure ( SCH ) laser diode . 24. A distributed feedback laser ( DFB ) is a type of single frequency laser diode . 25. Laser diodes are available in powers up to the kW range and somewhat better efficiency.26. Mass production of laser diodes for commercial devices like laser projectors have driven down prices. 27. Some important properties of laser diodes are determined by the geometry of the optical cavity. 28. Laser diodes of the common type have an optical cavity built into the semiconducting material.29. Most laser sights use a red laser diode . 30. The firearms adaptive target acquisition module LLM01 laser light module combines visible and infrared laser diodes .
