分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： We propose a composite acousto-optical modulation (AOM) scheme for wide-band, efficient modulation of CW and pulsed lasers. We show that by adjusting the amplitudes and phases of weakly-driven daughter AOMs, diffraction beyond the Bragg condition can be achieved with exceptional efficiencies. Furthermore, by imaging pairs of AOMs in a counter-propagating configuration, high contrast switching of output orders can be achieved at the driving radio frequency (rf) limit, thereby enabling efficient bidirectional routing of a synchronized mode-locked laser. Here we demonstrate a simplest example of such scheme with a double-AOM setup for efficient diffraction across an octave of rf bandwidth, and for routing a mode-locked pulse train with up to $f_{\rm rep}=400$~MHz repetition rate. We discuss extension of the composite scheme toward multi-path routing and time-domain multiplexing, so as to individually shape each pulses of ultrafast lasers for novel quantum control applications.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： Accurate control of single emitters at nanophotonic interfaces may greatly expand the accessible quantum states of coupled optical spins in the confined geometry and to unveil exotic nonlinear quantum optical effects. However, the optical control is challenged by spatially varying light-atom coupling strength generic to nanophotonics. We demonstrate numerically that despite the near-field inhomogenuity, nearly perfect atomic state control can be achieved by exploiting geometric robustness of optical transitions with composite picosecond excitations. Our proposal is followed by a proof-of-principle demonstration where an $N=3$ composite sequence is applied to robustly invert the D1 population of free-flying $^{85}$Rb atoms trespassing a nanofiber interface. The precise control is confirmed by comparing the D2 fiber transmission with full-level simulation of the mesoscopic light-atom interaction across the composite parameter space. We project the scheme to large $N$ for precise phase patterning and arbitrary optical dipole control at the nanophotonic interface.
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