Abstract
The temporal behavior of the conversion efficiency in the second harmonic generation (SHG) of a copper vapor laser (CVL) at 510.6 nm has been investigated experimentally and theoretically. We measured the temporal change of the beam divergence using a streak camera. We observed narrowing of the beam divergence during the pulse. We also found that the narrowing ratio depends on the lasing condition. The saturation of the conversion efficiency, that is, the deviation from the square law of SHG, was caused by the delay of the narrowing of the beam divergence during the pulse at higher laser average power.
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