One aspect of the present disclosure relates to a medical laser system, comprising: a first laser source comprising at least a first gain medium for generating a first optical field along a first optical axis； and at least one first Q-switch configured to control a resonance quality of the first laser source； a control circuit configured to control the first Q-switch to cause the first laser source to generate the first optical field as a first pulse train of laser pulses； a second laser source for generating a second optical field as a second pulse train of laser pulses along a second optical axis； at least one nonlinear medium for generating a third optical field along a third optical axis by a nonlinear interaction between the first optical field and the second optical field； a sensor configured to detect a property of at least one of the optical fields； wherein the control circuit is configured to control operation of the first Q-switch so as to adjust a relative timing of the laser pulses of the first pulse train and the laser pulses of the second pulse train responsive to the detected property.
