Injection seeders are devices that direct the output of small "seed"lasers into thecavity of a much larger laser to stabilize the latter's output. Most seed lasers are stable,single-frequency lasers that emit within thelinewidth of the larger laser'sgain medium. The single frequency encourages the larger laser to lase in a singlelongitudinal mode, and the seed laser can also improve the laser's spatial profile and improve theM2 parameter. Seed lasers can becontinuous or pulsed. Seeding a pulsed laser can reduce variations in the output energy and timing (jitter) from pulse to pulse, and smooth out temporal variations within the pulse. Many commercial lasers use alaser diode as a seeding source.
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| Laser physics | |
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