Journal
OPTICS EXPRESS
Volume 28, Issue 20, Pages 29756-29765Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.403447
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Funding
- National Natural Science Foundation of China [61705128, 61727820, 61975120, 91850203]
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Resonant cascaded nonlinearity (RCN) induced by optical parametric amplification (OPA) in a chirped quasi-phase-matching chip can be applied to control the group velocity of ultrafast lasers. However, the group delay produced in a single-stage OPA is limited to the pulse duration, and its sign cannot be altered. In this study, we propose a tandem RCN configuration with multiple OPA stages that can produce large-magnitude and sign-controllable group delays. The group delay produced in the multi-stage configuration is shown to be a linear superposition of each single-stage group delay. By virtue of the byproduct idler in the OPA process, the signal-group delay can be altered from positive to negative (and vice versa) with the same chip structure and pump condition. In the numerical simulation with two OPA stages, both a positive and negative group delay of six-fold pulse duration were achieved for 100-fs pulses at 1550 nm. A much larger group delay can be achieved by increasing the number of OPA stages. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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