Page 490 - High Power Laser Handbook

458 Fi b er L a s er s Intr oduction to Optical Fiber Lasers 459

amplification of femtosecond pulses up to millijoule energy levels is
enabled by the simultaneous implementation of the CPA technique
and large core fibers, as discussed in Sec. 15.2.4. In CPA, the pulses
are stretched temporally prior to amplification. After pulse amplifica-
tion, the pulses are recompressed close to the bandwidth limit in a
bulk grating pair. Because pulse stretching and compression ratios on
the order of 1000–10000 can be implemented, the peak power inside
the actual fiber amplifier can be greatly reduced. Because of the vari-
ous nonlinear limitations of optical fibers, CPA schemes operate with
typical pulse peak powers of the order of 0.1–1.0 MW inside the fiber.
A more detailed discussion of ultrafast fiber amplification schemes is
provided in Chap. 17.

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