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What is a single-mode laser? what is a multimode laser?
Single mode lasers emit a single wavelength of light, while multimode lasers emit multiple wavelengths. This is due to the fact that single mode lasers use a single cavity mode, whereas multimode lasers use multiple cavity modes.
Single mode lasers are more suitable for long-distance communication because they have a narrower beam width, allowing for better signal transmission over longer distances.
The typical wavelength range for single mode lasers is between 1,300nm to 1,600nm. However, this can vary depending on the specific laser design and application.
Multimode lasers are commonly used in laser printers, laser pointers, and fiber optic communication systems. They are also used in medical procedures, such as laser eye surgery and cosmetic laser treatments.
Single mode lasers have a higher beam quality, meaning that the beam is more focused and has a smaller spot size. Multimode lasers have lower beam quality, resulting in a larger spot size and less focused beam.