Schwartz Osip, Raz Oren, Katz Ori, Dudovich Nirit, Oron Dan
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel.
Opt Express. 2011 Jan 17;19(2):679-86. doi: 10.1364/OE.19.000679.
Ultrafast science is inherently, due to the lack of fast enough detectors and electronics, based on nonlinear interactions. Typically, however, nonlinear measurements require significant powers and often operate in a limited spectral range. Here we overcome the difficulties of ultraweak ultrafast measurements by precision time-domain localization of spectral components. We utilize this for linear self-referenced characterization of pulse trains having ∼ 1 photon per pulse, a regime in which nonlinear techniques are impractical, at a temporal resolution of ∼ 10 fs. This technique does not only set a new scale of sensitivity in ultrashort pulse characterization, but is also applicable in any spectral range from the near-infrared to the deep UV.
由于缺乏足够快的探测器和电子设备，超快科学本质上基于非线性相互作用。然而，通常非线性测量需要相当大的功率，并且常常在有限的光谱范围内进行。在此，我们通过光谱分量的精确时域定位克服了超微弱超快测量的困难。我们将此用于对每个脉冲约有1个光子的脉冲序列进行线性自参考表征，在这种情况下非线性技术并不实用，其时间分辨率约为10飞秒。该技术不仅在超短脉冲表征中设定了新的灵敏度尺度，而且还适用于从近红外到深紫外的任何光谱范围。
