Researchers realize excessive-efficiency frequency conversion on constructed-in photonic chip

A team led by Prof. GUO Guangcan and Prof. ZOU Changling from the University of Science and Abilities of China of the Chinese language Academy of Sciences realized setting pleasant frequency conversion in microresonators thru a degenerate sum-frequency project, and performed contaminated-band frequency conversion and amplification of remodeled signal thru gazing the cascaded nonlinear optical effects contained in the microresonator. The survey used to be revealed in Physics Evaluate Letters.

Coherent frequency conversion project has extensive utility in classical and quantum records fields equivalent to communication, detection, sensing, and imaging. As a bridge connecting wavebands between fiber telecommunications and atomic transition, coherent frequency conversion is an vital interface for disbursed quantum computing and quantum networks.

Constructed-in nonlinear photonic chip stands out thanks to its principal technological advances of making improvements to nonlinear optical effects by microresonator’s enhancing the sunshine-topic interaction, along with diversified advantages bask in shrimp size, huge scalability, and low vitality consumption. These receive constructed-in nonlinear photonic chips a in point of fact vital platform to covert optical frequency efficiently and realize diversified nonlinear optical effects.

On the replacement hand, the on-chip resonant-enhanced coherent frequency conversion requires multiple (three or extra) modes of phase matching situation among sure wavelengths, which imposes principal challenges to the devices’ develop, fabrication, and modulation. Especially in the utility of atomic and molecular spectroscopy, the intrinsic error brought by nanofabrication method of constructed-in nonlinear photonic chips makes the resonant frequency of microresonator laborious to compare atomic transition frequency.

The researchers in this survey proposed a brand new plot for excessive-efficiency coherent frequency conversion requiring easiest the 2-mode phase matching situation thru a degenerate sum-frequency project. They performed true tuning of the frequency window (FW): indecent tuning by adjusting the tool temperature with a tuning vary of 100 GHz; magnificent tuning with MHz stage basically basically based on old work of all-optical thermal control in an constructed-in microcavity.

The results showed that the finest performed efficiency used to be up to 42% all the draw thru the photon-amount conversion from 1560-nm-extensive to 780-nm-extensive wavelength, indicating a frequency tuning bandwidth over 250GHz. This overjoyed the interconnection of telecom photons and rubidium (Rb) atoms.

Moreover, the researchers experimentally verified cascaded χ(2) and Kerr nonlinear optical effects within a single microresonator to prolong the remodeled signal, which used to be neglected earlier than. Thus the best conversion efficiency used to be attainable to enact over 100% thru adjusting tool fabrication parameters, fulfilling simultaneously signal remodeled and amplified.

This survey provides a unusual system for setting pleasant on-chip frequency conversion, which is amazingly vital for on-chip quantum records processing.

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