| Popis: |
In recent years,all-solid-state passively Q-switched laser technology gets a rapid progress in obtaining picosecond pulses.Comparing with mode-locked lasers with complicated structure,sensitive and difficult alignment,these Q-switched picosecond lasers show great practical potentials for their characters of low cost,simple structure and easy alignment.These Q-switched lasers can provide picosecond pulses with considerable energy,and with the advantage of adjustable pulse repetition rate.In this paper,two existing passively Q-switched picosecond laser approaches,namely,Cr∶YAG microchip lasers,semiconductor saturable absorber mirror(SESAM) microchip lasers,are discussed accompany with the consideration of further treatment to the latter one by nonlinear optical processing and amplification,which are introduced to get narrower pulse width and higher pulse energy.In two categories,we review remarkable work in this field along with breakthroughs of them. |
