摘要
通过比较a切,45°切割Nd∶YVO4晶体连续(CW)和以Cr4+∶YAG晶体为被动调Q器件激光器的输出特征,发现Nd∶YVO4晶体在激光器中既作为增益介质,又作为双折射o光,e光分裂器件。在不同的运转条件下,o光,e光偏振模式相互竞争,导致离轴晶体在连续运转时表现出a切晶体的特征,有较小的阈值、光-光转换效率高;在被动调Q运转时,则表现出c切晶体的特征,在1340 mW的激光二极管(LD)抽运功率下,可以获得峰值功率0.6 kW,重复频率为18.7 kHz,脉宽为6.5 ns的脉冲。
The characteristics of 45°-off-axially-cut and a-cut Nd： YVO4 crystal, were compared for continuous wave （CW） and passively Q-switching operations by Cr^4＋ ： YAG crystal as the intracavity saturable absorber. By analyzing the experimental results, the 45°-off-axially-cut Nd： YVO4 exhibited parts of properties of the a-cut and c-cut crystals for CW passively Q-switching operations respectively, due to the competition between π polarization and σ polarization simulated emissions. With the laser diode （LD）-pump power of 1340 mW, a peak power of 0.6- kW with a 6.5-ns pulse width and 18.7-kHz repetition rate was obtained.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2006年第6期748-752,共5页
Chinese Journal of Lasers
基金
江苏省教育厅自然科学基金(04KJD140196)资助项目
