The correct answer is: C. Solid-state
A semiconductor laser is a type of laser that uses a semiconductor as the active medium. The semiconductor is typically a p-n junction, which is a region in a semiconductor where the p-type and n-type materials meet. When a voltage is applied to the p-n junction, electrons are injected from the n-type material into the p-type material. These electrons then recombine with holes in the p-type material, releasing energy in the form of light.
The bandwidth of a laser is the range of frequencies that it can emit. The bandwidth of a semiconductor laser is typically much broader than that of other types of lasers, such as gas lasers and dye lasers. This is because the energy levels in a semiconductor are much closer together than the energy levels in other materials. As a result, semiconductor lasers can emit a wide range of frequencies, which makes them ideal for applications such as spectroscopy and telecommunications.
The other options are incorrect because they do not describe the type of laser that has the broadest bandwidth. Option A, “Injection,” refers to a method of injecting electrons into a semiconductor laser. Option B, “Pulsed,” refers to a type of laser that emits light in pulses. Option D, “Silicon hybrid,” refers to a type of laser that uses a combination of silicon and other materials.