Townes Laser Institute, CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.
Opt Lett. 2013 Jan 15;38(2):121-3. doi: 10.1364/OL.38.000121.
We demonstrate a Tm-doped fiber laser system producing ~300 fs pulses with 1 μJ energy, corresponding to peak powers greater than 3 MW. Pulses of 150 fs with 30 nm spectral bandwidth and 3 nJ pulse energy are generated in a Raman-soliton self-frequency shift amplifier, then stretched to ~160 ps using a chirped Bragg grating. The 60 MHz oscillator repetition rate is reduced to 100 kHz using an electro-optic modulator. After a single-mode fiber preamplifier and a large-mode-area fiber power amplifier, pulses were compressed using a folded Treacy grating setup to below 500 fs with up to 1 μJ pulse energy. To the best of our knowledge, this is the highest energy yet demonstrated as well as the first demonstration of peak powers exceeding 1 MW from a Tm:fiber laser system.
我们展示了一种 Tm 掺杂光纤激光系统，该系统可产生具有 1 μJ 能量的 ~300 fs 脉冲，对应的峰值功率超过 3 MW。在拉曼孤子自频移放大器中产生了具有 30 nm 光谱带宽和 3 nJ 脉冲能量的 150 fs 脉冲，然后使用啁啾布拉格光栅将其拉伸至 ~160 ps。通过电光调制器将 60 MHz 振荡器重复率降低到 100 kHz。在单模光纤预放大器和大模场光纤功率放大器之后，使用折叠 Treacy 光栅设置将脉冲压缩到 500 fs 以下，同时脉冲能量高达 1 μJ。据我们所知，这是迄今为止展示的最高能量，也是首次从 Tm：光纤激光系统中演示超过 1 MW 的峰值功率。
