Frequent measurement can suppress the transitions between different quantum states. This quantum physics phenomenon can play a very good role in the state control. This effect can be helpful to the laser amplification technology. Therefore, this article attempts to use this quantum effect to realize the amplification without population inversion. The article first introduce this phenomenon, and then explain what frequent measurements are. Finally, a simple model is simulated by using hydrogen atom system as a medium for optical amplification without population inversions.
We demonstrated experimentally a new method for generation of linearly chirped light waves with almost perfect linearity over a broad range of about 800 GHz. The external modulation method that we adopt can maintain frequency jitters at a very low level by avoiding relaxation oscillation effects which are an intrinsic property in intra-cavity modulation methods. The linearly chirped light could provide an excellent time-frequency mapping tool for wide-range applications.