激光击穿不同气体的激光推进实验研究

为了研究激光击穿气体工质的机理,通过测量冲量耦合系数,比较了激光在不同压强下击穿不同惰性单原子气体(氩气、氦气)的效果,试验结果表明:原子序数较大的无机气体原子可以电离出更多的电子,从而击穿阈值更低,激光能量转化为爆轰波能量的能量转化效率更高,冲量耦合系数就越大,同样条件下更容易击穿。推进剂气体不同,冲量耦合系数差别较大。测量摆角对结果的影响也较大。

Experimental study of laser propulsion in different gases

To study the laser breakdown mechanism in different gases , laser breakdown effects in different monatomic inert gases(Argon?Helium) under different ambient pressures were compared by the measurement of impulse coupling coefficients. The results show that inorganic gas which has higher atomic number could ionize more electrons. This kind of gas ofter has lower breakdown threshold, and the transform efficiency from laser energy to blast wave is higher, so the impulse coefficient is higher, and in the same condition , it is easier to breakdown. Different gases have a huge contrast of impulse coefficients. Also measuring angles of oscilaltion have great effect on test results.