Laser performance is greatly dependent on its operating conditions due to the strong coupling among multi- physics such as gas-dynamics, chemical reaction kinetics and optics in the mixing nozzle of COIL. In this pape...Laser performance is greatly dependent on its operating conditions due to the strong coupling among multi- physics such as gas-dynamics, chemical reaction kinetics and optics in the mixing nozzle of COIL. In this paper, 3D CFD technology is used to simulate the mixing and reactive flow of subsonic cross jet scheme at different conditions. Results obtained show that the jet penetration depth plays a dominant role in the spatial distribution of small signal gains. In the case of over-penetration, unsteady flow structures are induced by impinging between the opposing jets. The optimum spatial distribution of the chemical performance cannot be obtained even if the full penetration condition is achieved through the subsonic transverse jet mixing scheme in the COIL nozzle flow.展开更多
对Nd,Y:CaF_2晶体作为激光放大器的增益介质进行了报道.研制了一台采用激光二极管面阵五向水平侧面抽运Ф5 mm×70 mm Nd,Y:CaF_2的激光放大器,对其进行了实验研究.测量了Nd,Y:CaF_2晶体的吸收谱、发射谱、以及放大器的荧光分布.在...对Nd,Y:CaF_2晶体作为激光放大器的增益介质进行了报道.研制了一台采用激光二极管面阵五向水平侧面抽运Ф5 mm×70 mm Nd,Y:CaF_2的激光放大器,对其进行了实验研究.测量了Nd,Y:CaF_2晶体的吸收谱、发射谱、以及放大器的荧光分布.在相同的抽运功率下,测量了Nd,Y:CaF_2与Nd:Glass放大器分别工作在10 Hz和1 Hz重复频率时的小信号增益,在抽运功率为9.63 kW时,Nd,Y:CaF_2放大器的小信号增益达6.12,为Nd:Glass的1.5倍.与Nd:Glass相比,Nd,Y:CaF_2晶体的重复工作频率不仅大大提高,而且增益性能也更强.测量了种子光和经Nd,Y:CaF_2放大器后的光谱,能量放大前后光谱几乎无变化.展开更多
基金the Korea Research Foundation Grant No.KRF-2005-005-J09901
文摘Laser performance is greatly dependent on its operating conditions due to the strong coupling among multi- physics such as gas-dynamics, chemical reaction kinetics and optics in the mixing nozzle of COIL. In this paper, 3D CFD technology is used to simulate the mixing and reactive flow of subsonic cross jet scheme at different conditions. Results obtained show that the jet penetration depth plays a dominant role in the spatial distribution of small signal gains. In the case of over-penetration, unsteady flow structures are induced by impinging between the opposing jets. The optimum spatial distribution of the chemical performance cannot be obtained even if the full penetration condition is achieved through the subsonic transverse jet mixing scheme in the COIL nozzle flow.