Green-diode-pumped femtosecond Ti:Sapphire laser with up to 450 mW average power.
Green-diode-pumped femtosecond Ti:Sapphire laser with up to 450 mW average power.
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DOI：
10.1364/oe.23.030043
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发表时间：
2015-11
期刊：
影响因子：
3.8
通讯作者：
K. Gürel;V. Wittwer;M. Hoffmann;C. Saraceno;S. Hakobyan;B. Resan;A. Rohrbacher;K. Weingarten;S. Schilt;T. Südmeyer
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文献类型：
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作者：
K. Gürel;V. Wittwer;M. Hoffmann;C. Saraceno;S. Hakobyan;B. Resan;A. Rohrbacher;K. Weingarten;S. Schilt;T. Südmeyer
我们研究了绿色二极管泵浦Ti：蓝宝石激光器在连续波（CW）和锁模操作下的功率缩放。在第一个配置中，入射到晶体上的总泵浦功率高达2w，我们使用半导体可饱和吸收镜（SESAM）作为可饱和吸收器，实现了高达440 mW的连续波功率和高达200 mW的自启动模式锁定，平均功率为68-fs脉冲。在第二种配置中，将高达3w的泵浦功率入射到晶体上，我们使用克尔透镜锁模（KLM）在连续波工作中实现了高达650 mW的功率，在58秒的脉冲中实现了高达450 mW的功率。最短的脉冲持续时间为39秒，使用KLM的平均功率为350兆瓦。锁模激光器以大约400兆赫的重复频率产生脉冲序列。不需要复杂的冷却系统：既不是SESAM也不是Ti：蓝宝石晶体主动冷却，只有空气冷却应用于泵浦二极管使用一个小风扇。由于激光显示器的大规模生产，我们预计绿色激光二极管的价格将在不久的将来变得非常有利，为低成本的Ti：蓝宝石激光器打开大门。这对于生物医学成像和传感等潜在的大规模应用将非常有吸引力。
We investigate power-scaling of green-diode-pumped Ti:Sapphire lasers in continuous-wave (CW) and mode-locked operation. In a first configuration with a total pump power of up to 2 W incident onto the crystal, we achieved a CW power of up to 440 mW and self-starting mode-locking with up to 200 mW average power in 68-fs pulses using semiconductor saturable absorber mirror (SESAM) as saturable absorber. In a second configuration with up to 3 W of pump power incident onto the crystal, we achieved up to 650 mW in CW operation and up to 450 mW in 58-fs pulses using Kerr-lens mode-locking (KLM). The shortest pulse duration was 39 fs, which was achieved at 350 mW average power using KLM. The mode-locked laser generates a pulse train at repetition rates around 400 MHz. No complex cooling system is required: neither the SESAM nor the Ti:Sapphire crystal is actively cooled, only air cooling is applied to the pump diodes using a small fan. Because of mass production for laser displays, we expect that prices for green laser diodes will become very favorable in the near future, opening the door for low-cost Ti:Sapphire lasers. This will be highly attractive for potential mass applications such as biomedical imaging and sensing.