Soliton dual comb in crystalline microresonators
N. G. Pavlov, G. Lihachev, S. Koptyaev, E. Lucas, M. Karpov, N. M., Kondratiev, I. A. Bilenko, T. J. Kippenberg, and M. L. Gorodetsky

TL;DR
This paper introduces a compact dual-comb source using crystalline MgF2 microresonators, generating coherent soliton combs suitable for spectroscopy, LIDAR, and optical communications.
Contribution
It demonstrates a novel monolithic crystalline microresonator stack producing stable dual soliton combs with potential for various advanced optical applications.
Findings
Dual combs generated with 12.1 GHz repetition rate
Difference in repetition rates is 1.62 MHz
Heterodyning produces a 300 MHz RF comb
Abstract
We present a novel compact dual-comb source based on a monolithic optical crystalline MgF multi-resonator stack. The coherent soliton combs generated in two microresonators of the stack with the repetition rate of 12.1 GHz and difference of 1.62 MHz provided after heterodyning a 300 MHz wide radio-frequency comb. Analogous system can be used for dual-comb spectroscopy, coherent LIDAR applications and massively parallel optical communications.
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