Abstract
Transverse beam profile characteristics of traveling-wave parametric generation in KTiOPO 4 crystals are investigated. Transverse beam profile depression and splitting due to the back-conversion in the parametric propagation process were observed even when the conversion efficiency was less than 10%. We measured the walk-off angle dependence and pump energy dependence of the transverse beam profiles. The transverse beam profile is ring shaped when there is no walk-off and deforms by expanding to the walk-off direction when walk-off exists. By decreasing the pump intensity, the deformation of the profile can be reduced due to the subsequent reduction in back-conversion. Walk-off compensation with two crystals placed next to each other with one in the opposite direction is also useful for getting a better transverse beam profile.
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