LD侧面泵浦Er^(3+),Yb^(3+)∶glass波导被动调Q激光器

LD Side Pumped Er^(3+),Yb^(3+)∶Glass Waveguide Passively Q-Switched Laser

报道了一种LD侧面泵浦铒镱共掺磷酸盐玻璃波导被动调Q激光器。采用无胶键合技术,在波导芯层(原子数分数1%Er^(3+),21%Yb^(3+)∶glass)的四侧键合厚度为0.1 mm的掺钴硼硅酸盐玻璃(Co^(2+)∶glass)作为包层,阻断放大自发辐射(ASE)的形成通路,提高激光输出效率。波导两侧分别键合硼硅酸盐K9光学玻璃作为泵浦光传输层,改善泵浦均匀性,提高输出激光的光束质量。在自由运转模式下,激光器输出的最大脉冲能量为34.7 mJ,斜率效率为10.6%。被动调Q模式下,获得稳定输出单脉冲能量2.16 mJ、脉宽4.7 ns、峰值功率459 kW的1.535μm脉冲激光,光束质量因子M2=1.53。实验结果表明,在Er^(3+),Yb^(3+)∶glass的四侧键合Co^(2+)∶glass是抑制其内部ASE效应、提高激光器单脉冲能量输出的有效方法。

LD side pumped Er^(3+),Yb^(3+)∶glass waveguide passively Qswitched laser was reported.By adhesivefree bonding techniques,Codoped borosilicate glass with a thickness of 0.1 mm was bonded on four sides of the core(atom fraction 1%Er^(3+),21%Yb^(3+)∶glass)of waveguide.The aim was to block the formation pathway of amplified spontaneous emission(ASE)and improve the output efficiency of laser.In order to improve the pump uniformity and output beam quality of laser,K9 borosilicate optical glass was bonded on both sides of waveguide as the transmission layer of pump.In freerunning mode,laser output was obtained with the maximum pulse energy of 34.7 mJ and the slope efficiency of 10.6%.In passively Qswitched mode,a pulse laser was achieved with wavelength of 1.535μm,single pulse energy of 2.16 mJ,pulse width of 4.7 ns,peak power of 459 kW,and beam quality factor M2=1.53.Experimental results demonstrate that the bonding of Co^(2+)∶glass on the four sides of Er^(3+),Yb^(3+)∶glass is an effective method to inhibit ASE effect and improve the output pulse energy of laser.