Chinese Optics Letters, Volume. 20, Issue 11, 111401(2022)

Intense, wideband optical waveform generation by self-balanced amplification of fiber electro-optical sideband modulation

Yuzhuo Wang1、*, Yizun He1, Lingjing Ji1, Jiangyong Hu1, Xing Huang1, Yudi Ma1, Liyang Qiu1, Kaifeng Zhao2,3, and Saijun Wu1、**
Author Affiliations
  • 1Department of Physics, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
  • 2Key Laboratory of Nuclear Physics and Ion-Beam Application (Ministry of Education), Fudan University, Shanghai 200433, China
  • 3Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433, China
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    We demonstrate a simple method to obtain accurate optical waveforms with a gigahertz-level programmable modulation bandwidth and a watt-level output power for wideband optical control of free atoms and molecules. Arbitrary amplitude and phase modulations are transferred from microwave to light with a low-power fiber electro-optical modulator. The sub-milliwatt optical sideband is co-amplified with the optical carrier in a power-balanced fashion through a tapered semiconductor amplifier (TSA). By automatically keeping TSA near saturation in a quasi-continuous manner, typical noise channels associated with pulsed high-gain amplifications are efficiently suppressed. As an example application, we demonstrate interleaved cooling and trapping of two rubidium isotopes with coherent nanosecond pulses.


    I. Introduction

    Optical control of atomic motion is traditionally accomplished by weakly dressing atoms in their ground-state manifolds, such as laser cooling, atom interferometry, and ion-based quantum information processing[17]. The long coherence time associated with the weakly dressed ground states makes it possible to precisely control the dynamics using modulated CW lasers, typically through acousto-optical modulation (AOM) with a megahertz (MHz)-level bandwidth[8]. On the other hand, full control of the strong-transition dynamics between ground and excited states becomes an emergent scenario, with many applications in atomic and quantum optics, such as for ultrafast optical acceleration of spinnor mattterwave[913], precise control of light-assisted interactions[14,15], and to access subradiant physics[1618]. Since strong transitions have coherence time radiatively limited to tens of nanoseconds, their full and coherent control requires optical waveforms with modulation bandwidth at the gigahertz (GHz) level beyond standard CW modulation technology. Although ultrafast pulses can have bandwidth beyond terahertz (THz), the pulse spectral brightness is usually too weak to efficiently drive the narrow transitions[1921].


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    Yuzhuo Wang, Yizun He, Lingjing Ji, Jiangyong Hu, Xing Huang, Yudi Ma, Liyang Qiu, Kaifeng Zhao, Saijun Wu. Intense, wideband optical waveform generation by self-balanced amplification of fiber electro-optical sideband modulation[J]. Chinese Optics Letters, 2022, 20(11): 111401

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    Paper Information

    Category: Lasers, Optical Amplifiers, and Laser Optics

    Received: Mar. 9, 2022

    Accepted: May. 31, 2022

    Published Online: Jul. 7, 2022

    The Author Email: Yuzhuo Wang (, Saijun Wu (



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