摘要
从LD端面抽运固体激光器的激光阈值公式出发,建立了双波长激光同时振荡的阈值条件,理论计算了腔镜对于两个波长的透过率关系,实现了LD端面抽运Nd:YAG1319nm/1338nm双波长激光连续和准连续输出.双波长激光连续输出功率可达6W,斜效率为30%;准连续输出功率在重复频率50kHz时可达4.75W,斜效率为24.73%,脉冲宽度为55.05ns;腔内插入布儒斯特片,在重复频率为50kHz时,双波长激光准连续线偏振输出功率可达2.22W,不稳定性小于0.52%,M2因子仅为1.16.这两条非常接近的谱线为进一步通过非线性光学差频方法获得高相干性太赫兹波提供了实验基础.
Based on the lasing threshold equation of a diode-end-pumped Nd ： YAG laser, the threshold condition of simultaneous dual-wavelength lasing is determined and the relationship between the transmission ratios of the output mirror corresponding to the two wavelengths is calculated. A simultaneous dual-wavelength continuous wave （cw） or quasi-cw diode-end-pumped Nd：YAG laser operating at 1319 nm and 1338 nm has been demonstrated. A total cw output power of 6 W was achieved at a pump power of 21.6 W with a slope efficiency of 30% . And a total quasi-ew output power of 4.75 W was obtained at a pump power of 21.6 W and a pulse repetition rate of 50 kHz, with a slope efficiency of 24.73 %, and the corresponding pulse width was 55.05 ns. Inserting a Brewster plate in the cavity and the highest linearly polarized wave output power was boosted up to 2.22 W at a pulse repetition rate of 50 kHz. The instability of the output power was less than 0.52% and the beam quality M2 factor was as low as 1.16 at the linearly polarized wave output power of 2.17W. The simultaneous dual-wavelength laser provides an experimental basis for generating highly coherent terahertz wave radiation of 3.23 THz by nonlinear optical difference frequency method.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期230-237,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10474071)
教育部博士点基金(批准号:20040056010)资助的课题~~
