Self-starting mode-locking Ti: sapphire oscillator synchronously pumped by femtosecond fiber laser
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摘要: 针对常规连续激光泵浦钛宝石激光振荡器不能自启动锁模的缺点，采用倍频飞秒光纤激光同步泵浦，通过调节振荡器腔长与泵浦腔长匹配，实现了飞秒钛宝石激光的自启动锁模。实验中采用3.4 W的倍频掺镱光纤激光同步泵浦钛宝石激光振荡器，获得了平均功率大于130 mW、重复频率75 MHz、光谱宽度大于47 nm、脉冲宽度17 fs的锁模脉冲输出，不仅能够稳定可靠地实现自启动锁模，解决了常规钛宝石激光振荡器锁模启动的困难，而且还具有同步输出1040，800，520 nm三束飞秒激光的特点，为进一步开展飞秒激光相干合成以及光参量放大等研究提供了优势基础。Abstract: We demonstrated a self-starting mode-locked Ti:sapphire laser by using a synchronously pumping scheme with a frequency doubled femtosecond Yb fiber laser. By carefully adjusting the cavity length of the Ti:sapphire oscillator to match the fiber laser, the mode-locking operation can start automatically. In the experiment, a femtosecond ytterbium-doped fiber laser at 520 nm was used to pump the Ti:sapphire laser synchronously. Under the 3.4 W pump power, 130 mW/17 fs mode locked laser pulses were obtained from the Ti:sapphire laser at the repetition rate of 75 MHz. It not only solves the difficulty of conventional Ti:sapphire oscillator for no-starting mode locking, but also synchronously supplies three femtosecond laser beams at central wavelengths of 1040, 800 and 520 nm, which paved an advanced way for further studies of coherent combination and optical parametric amplification.
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图 1 倍频飞秒光纤激光同步泵浦钛宝石振荡器系统光路图
Figure 1. Optical circuit diagram of femtosecond fiber laser synchronous pumping Ti:sapphire oscillator system
图 4 钛宝石振荡器与飞秒泵浦源的锁模脉冲序列
Figure 4. Mode-locked pulse train for a Ti:sapphire oscillator and femtosecond pump source
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