开放的梯型无反转激光系统Doppler展宽对增益的影响

研究表明：当探测场和驱动场都失谐时，Doppler展宽的变化仅对无反转地．增益的检大值有明显的影响，而且极大值随Doppler展宽的增加而迅速减小；当探测场失谐驱动场共振且Doppler展宽取适当值时，系统可以获得增益极大值中的最大值；这个最大值随原子注入速率比的增加而增加，频率上转换的程度越高，为达到这个极大值所要求的Doppler展宽越小；在开放的梯型无反转激光（LWI）系统中Doppler展宽对增益的影响与从其他LWI系统中得到的有明显的差别。

Effect of Doppler Broadening on the Gain in an Open Ladder Inversionless Lasing System

The study shows that:When there are detunings of the probe and driving fields,the variation of Doppler width has an obvious effect only on the maximum of the invesionless gain,which decreases rapidly with Doppler width increasing;when there is a probe-detuning and the driving field is resonant,the system can get an extreme value of maximum of the invesionless gain when Doppler width takes a suitable value;the extreme values increase with the ratio of the atomic injection rates increasing;the higher the degree of the frequency up-conversion attains the extreme value is;the effect of Doppler broadening on the gain in an open ladder-type lasing without inversion(LWI) system have some obvious differences from those obtained from other LWI systems.