We have made the first observation of a two-photon light shift: a shift of a two-photon resonance due to a third, non-resonant light field. The effect is observed in cross-saturation spectroscopy of neon pumped by a standing-wave saturator field, to which the neon is rendered transparent....
As a distinctive feature, two photons are never detected simultaneously in the light scattered by the emitter. This is commonly interpreted by saying that a single two-level quantum emitter can only absorb and emit single photons. However, it has been theoretically proposed that the photon anti...
Two colours of light drive PET-RAFT photoligation. Polym. Chem. 11, 6453–6462 (2020). Article CAS Google Scholar Hahn, V. et al. Two-step absorption instead of two-photon absorption in 3D nanoprinting. Nat. Photon. 15, 932–938 (2021). Article ADS CAS Google Scholar De Beer, M...
light-shift effects, is demonstrated on weak two-photon transitions in atomic rubidium and caesium, thereby improving the frequency accuracy up to thirty ... J Morgenweg,I Barmes,KSE Eikema - 《Nature Physics》 被引量: 16发表: 2013年 Coherent population trapping in 87Rb atoms induced by the...
In this letter, the two-photon absorption (TPA) probability in a Pr3+ ion system is enhanced by a factor of 12.3 by a ∏-phase step scanning of ultrashort laser pulses. This level is significantly higher than that achieved by a transform-limit pulse. However, the laser intensity of ...
In confocal one-photon excitation microscopy, a pinhole in front of the detector rejects out-of-focus emission light, thereby greatly reducing the depth of field in the emission path. In contrast, excitation of the fluorophores takes place over a much larger distance along the optical axis than...
Here, we combined two-photon holography to stimulate neurons expressing blue light-sensitive opsins (ChR2 and GtACR2) with two-photon imaging of the red-shifted indicator jRCaMP1a in the mouse neocortex in vivo. We demonstrate efficient control of neural excitability across cell types and layers ...
The upper part shows two-photon comb (TPC), and the lower part shows a wavelength converter. SPDC pump light was produced by second harmonic generation (SHG) from a 1514-nm external cavity diode laser (ECDL). A half-wave plate (HWP) changes the polarization of the pump light to adjust ...
A pair of diode laser frequency standards stabilized to 778 nm two-photon rubidium transitions have been developed and characterized. Their sensitivity to vapour pressure, modulation depth and optical power have been investigated, along with their relative stability and day-to-day reproducibility. The ...
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