Transient pulse evolution of active mode locking in an intracavity frequencyhyphen;doubled laser

摘要

The theory of transient mode locking for an active modulator in an intracavity frequencyhyphen;doubled laser is presented. The theory is applied to modehyphen;locked and intracavity frequencyhyphen;doubled Nd:YAG laser and the modehyphen;locked pulse width is plotted as a function of number of round trips inside the cavity. It is found that the pulse compression is faster and the system takes a very short time to approach the steady state in the presence of a second harmonic generating crystal inside the laser cavity. The effect of modulation depth and the second harmonic conversion efficiency on the temporal behavior of the pulse width is discussed.