Esteban-Martin A, Kokabee O, Moutzouris K, Ebrahim-Zadeh M
Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain. adolfo.esteban@icfo
Opt Lett. 2009 Feb 15;34(4):428-30. doi: 10.1364/ol.34.000428.
We demonstrate the generation of femtosecond pulses in a synchronously pumped optical parametric oscillator (SPOPO) at the harmonics of pump repetition rate using a SPOPO cavity longer than the fundamental synchronous length. The SPOPO is based on a 1 mm crystal of periodically poled LiNbO(3) and pumped by a Kerr-lens mode-locked Ti:sapphire laser at 76 MHz. By increasing the SPOPO synchronous cavity length we have generated output signal pulses at successive harmonics of the pump repetition rate up to the 13th harmonic at 988 MHz, where average signal powers of 30 mW are still available for 1.45 W of pump power. The generated signal pulses at 988 MHz are near transform limited with average durations of 227 fs and a time-bandwidth product of 0.41 for 185 fs input pump pulses.
我们展示了在一个同步泵浦光学参量振荡器（SPOPO）中，使用一个比基波同步长度更长的SPOPO腔，以泵浦重复频率的谐波产生飞秒脉冲。该SPOPO基于一块1毫米的周期性极化铌酸锂（LiNbO₃）晶体，并由一台克尔透镜锁模钛宝石激光器在76兆赫兹下泵浦。通过增加SPOPO同步腔的长度，我们已在泵浦重复频率的连续谐波处产生了输出信号脉冲，直至988兆赫兹的第13谐波，在此处对于1.45瓦的泵浦功率，仍可获得30毫瓦的平均信号功率。对于185飞秒的输入泵浦脉冲，在988兆赫兹处产生的信号脉冲接近变换极限，平均持续时间为227飞秒，时间带宽积为0.41。
