In the context of LIDAR, which of the following describes 'semiconductor laser'?

• A. A type of gas laser
• B. A type of fiber laser
• C. What type of laser LIDAR uses
• D. A type of solid-state laser

Answer: (C)

In the context of LIDAR (Light Detection and Ranging), a semiconductor laser is a key component that significantly influences the system's functionality. LIDAR systems utilize lasers to emit light pulses that bounce off objects, helping to determine distances based on the time it takes for the light to return.

The semiconductor laser, which falls under the category of solid-state lasers, is an essential choice for many LIDAR applications due to its compact size, efficiency, and ability to produce coherent light suitable for precision distance measurement. This type of laser is made using semiconductor materials and differs from other types, such as gas lasers or fiber lasers, in terms of structure and operation.

In summary, identifying the semiconductor laser as the type of laser used in LIDAR highlights its relevance in achieving accurate distance measurements and its practicality in compact systems, which are essential for effective speed measurement in various applications, including traffic enforcement.