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This work is focused on the active vibration control of piezoelectric cantilever beam, where an adaptive feeedforward controller (AFC) is utilized to reject the vibration with unknown multiple frequencies. First, the experiment setup and its mathematical model are introduced. Because the channel between the disturbance and the vibration output is unknown in practice, a concept of equivalent input...
The Beam quality of multimode fiber lasers is studied. Coiling technique is ineffective for fibers with too large core diameter or NA. The influence of coiling on the performance of fiber lasers is discussed.
KW level CW high power output and 20 W high repetition rate pulsed output are obtained with China made multimode core fibers. The laser structure and pulse amplifier technology are given in detail.
KW level CW high power output and 150 W high repetition rate pulsed output are obtained with China made multimode core fibers. The laser structure and pulse amplifier technology are given in detail.
The stimulated Raman scattering (SRS) in high-power ytterbium-doped fiber laser with typical end pumping scheme is investigated. A special Yb-doped large-mode- area (LMA) double-cladding fiber is designed for enhance the SRS effect in continuous wave (CW) fiber laser. And a near 300 nm ultra-broadband CW super-continuum source with maximum output power of 2.6 W centered at 1400 nm is demonstrated...
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