About Lesson
-
Definition:
A laser (Light Amplification by Stimulated Emission of Radiation) is a device that produces a highly concentrated and coherent beam of light through a process of optical amplification. -
How it Works:
Lasers work by exciting atoms or molecules within a gain medium (material that amplifies light). This energy causes the release of photons, which are amplified and emitted as a laser beam. -
Key Components of a Laser:
- Gain Medium: The material (solid, liquid, or gas) that amplifies light.
- Energy Source: Provides the power to excite the atoms (e.g., electrical current, flash lamps).
- Optical Cavity: Contains reflective mirrors that reflect and amplify the light.
-
Unique Properties of Laser Light:
- Monochromatic: Only emits light at a single wavelength.
- Coherent: All light waves are synchronized and travel in phase.
- Collimated: The laser beam maintains a narrow, focused path over long distances.