摘要
A speckle pattern is observed when a neodymium-doped yttrium aluminum garnet （Nd：YAG） laser is homogenized by a diffractive optical element （DOE） due to its high spatial coherence. Therefore, a Nd：YAG laser homogenized by a DOE was previously considered not suitable to pump a Ti：sapphire laser amplifier. However, we show by experiment and simulation that the speckle structure does not manifest itself in the final amplified Ti：sapphire laser beam. By using the homogenizer, a smooth distribution of the amplified laser beam is obtained. No degradation of the energy, the wavefront, and the temporal characteristics of the amplified laser beam is observed.
A speckle pattern is observed when a neodymium-doped yttrium aluminum garnet （Nd：YAG） laser is homogenized by a diffractive optical element （DOE） due to its high spatial coherence. Therefore, a Nd：YAG laser homogenized by a DOE was previously considered not suitable to pump a Ti：sapphire laser amplifier. However, we show by experiment and simulation that the speckle structure does not manifest itself in the final amplified Ti：sapphire laser beam. By using the homogenizer, a smooth distribution of the amplified laser beam is obtained. No degradation of the energy, the wavefront, and the temporal characteristics of the amplified laser beam is observed.
基金
This work was supported by the National Basic Research Program of China （No. 2013CBA01501） and the National Natural Science Foundation of China （Nos. 11135012 and 11375262）.
