CERO技术

差频梳(DFC)的“零fCEO

CERO-technology at a glance

无偏移差频梳(DFC)的工作原理依赖于从低噪声Er光纤锁模振荡器的输出生成宽带超连续谱,以及随后在低和高噪声之间产生光差频率(DFG)。非线性晶体中倍频程频谱的频率部分。最重要的功能是改进的稳定性和更简单可靠的全被动频率偏移稳定功能。由于对原始频谱的两个部分进行了共模抑制,因此梳齿没有偏移相位和偏移频率的波动。另外,DFC的载波包络偏移频率fCEO固定为零。

  • 用Er3 +光纤振荡器和非线性光纤生成宽带超连续谱
  • 非线性晶体中超连续谱上下频谱部分之间的差分频率生成
  • 两个光谱部分具有相同的fCEO
  • 由此产生的梳状结构是载波包络相位稳定的,并且fCEO固定为零
  • TOPTICA专利(DE102004022037)

The passive all optical fCEO stabilization has distinct advantages with respect to the conventional f-to-2f-interferometer approach. This has been pointed out by several major players in the field of frequency metrology (Krauss et al., Opt. Lett, 36, 540 (2011)). The biggest advantage of the passive stabilization is that it is not limited by electronic noise. Additionally, no carrier envelope offset beat alignment or complicated drift compensation are required and the absence of carrier envelope offset locking electronics reduces the complexity of the electronics package significantly. The only adjustable parameter is the repetition rate of the DFC. It can easily be stabilized to any suitable radio frequency (RF) reference.

Advantages of CERO technology

200 MHz的有效锁定带宽

超低CEP噪声

非常适合与光学参考一起使用

  • DFG in the literature

    TOPTICAs frequency comb DFC shows quadratic scaling of the phase noise with frequency. This textbook like behavior has been shown to a remarkable degree. The DFC behaves like an elastic tape with a true fixpoint at zero. An ideal system to be combined with an optical reference. Characterization of a DFG comb showing quadratic scaling of the phase noise with frequency, T. Puppe et al., Optics Letters Vol. 41, Issue 8 (2016)

    “The DFG comb possesses a vanishing carrier envelope offset frequency that permits the construction of a simple and thus potentially more stable optical clockwork.Zimmermann, Gohle, Holzwarth, Udem and Hänsch, Opt. Lett., 29, 310 (2004)

    “This all passive approach provides extremely reliable and rigid locking of fCEO on both short and long time scales”, Krauss, Fehrenbacher, Brida, Riek, Sell, Huber, and Leitenstorfer, Opt. Lett., 36, 540 (2011)

    “… in this nonlinear process the phases of the two pulses add up with different signs, leading to CEP cancellation and resulting in passive, all-optical phase stabilization.”Manzoni, Cerullo, and De Silvestri, Opt. Lett., 29, 2668 (2004)

    “The unique feature … is that fCEO of the DF is zero without any servo-loop feedback system; i.e., the waveform is self-stabilized in the resultant pulse train.” “The generated phase-stable pulses may - after preamplification - be suitable for seeding high-gain Ti:sapphire amplifiers and (or) the oscillator itself.”Fuji, Apolonski and Krausz, Opt. Lett., 29, 632 (2004)

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