Demmler Stefan, Rothhardt Jan, Heidt Alexander M, Hartung Alexander, Rohwer Erich G, Bartelt Hartmut, Limpert Jens, Tünnermann Andreas
Institute of Applied Physics, Friedrich-Schiller University Jena, Albert-Einstein Straße 15, 07745 Jena, Germany.
Opt Express. 2011 Oct 10;19(21):20151-8. doi: 10.1364/OE.19.020151.
Nonlinear pulse compression based on the generation of ultra-broadband supercontinuum (SC) in an all-normal dispersion photonic crystal fiber (ANDi PCF) is demonstrated. The highly coherent and smooth octave-spanning SC spectra are generated using 6 fs, 3 nJ pulses from a Ti:Sapphire oscillator for pumping a 13 mm piece of ANDi PCF. Applying active phase control has enabled the generation of 4.5 fs pulses. Additional spectral amplitude shaping has increased the bandwidth of the SC spectra further leading to nearly transform-limited pulses with a duration of 3.64 fs, which corresponds to only 1.3 optical cycles at a central wavelength of 810 nm. This is the shortest pulse duration achieved via compression of SC spectra generated in PCF to date. Due to the high stability and the smooth spectral intensity and phase distribution of the generated SC, an excellent temporal pulse quality exhibiting a pulse contrast of 14 dB with respect to the pre- and post-pulses is achieved.
演示了基于在全正色散光子晶体光纤（ANDi PCF）中产生超宽带超连续谱（SC）的非线性脉冲压缩。使用来自钛宝石振荡器的6 fs、3 nJ脉冲泵浦一段13 mm长的ANDi PCF，产生了高相干且平滑的倍频程超连续谱。应用有源相位控制实现了4.5 fs脉冲的产生。额外的光谱幅度整形进一步增加了超连续谱的带宽，从而产生了持续时间为3.64 fs的近变换极限脉冲，在中心波长810 nm处仅对应1.3个光学周期。这是迄今为止通过压缩光子晶体光纤中产生的超连续谱所实现的最短脉冲持续时间。由于所产生的超连续谱具有高稳定性以及平滑的光谱强度和相位分布，实现了优异的时间脉冲质量，相对于前后脉冲的脉冲对比度为14 dB。
