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The objective of this study is to compare the performance of different seats using the named three dummies in low speed rear-end impact sled tests.

Active mode locking of a Pr3+/Yb3+-doped upconversion fluoride fiber laser with an all-fiber ZnO acousto-optic phase modulator is demonstrated for the first time to the authors' knowledge. Optical pulses of similar to 550-ps duration with a repetition rate of 239 MHz at a wavelength of 635 nm have been generated. (C) 2000 Optical Society of America.

Rare-earth-doped fibers have established themselves as an attractive and power-scalable solid-state laser concept. Using step-index large-mode-area fibers in continuous-wave operation, output powers approaching the kW regime with diffraction-limited beam quality have been demonstrated. In the pulsed regime, average powers on the order of 100 W even for femtosecond fiber laser systems have been reported. Thermo-optical and nonlinear effects within the fiber itself limit the linear power scaling of these systems. Microstructuring the fiber adds several useful features to the fiber for overcoming these restrictions. We review the advantages of rare-earth-doped photonic-crystal fibers for the power scaling of fiber lasers to the multi-kW range with excellent beam quality. The application of the techniques of coherent and incoherent beam combining of fiber lasers and amplifiers for further power scaling are discussed.