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Fiber-Interferometric Second Harmonic Generator for Dual-Color Standard Quantum-limited Noise Suppression

Marvin Edelmann, Mikhail Pergament, Yi Hua, Malek M. Sedigheh, Franz X. Kärtner

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We present a novel fiber-interferometric mechanism that employs controlled nonlinear polarization rotation in interaction with type-I phase matched SHG to generate dual-color optical pulse trains (515/1030 nm) with concurrent >14 dB standard-quantum limited noise suppression.
DOI
10.1364/cleo_si.2024.sf2q.8

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The second harmonic generation (SHG) process is investigated theoretically using the quantum mechanics method of coherent control. Based on the extremum conditions for the SHG intensity at the center frequency, a Fresnel-inspired binary phase shaping scheme is proposed for tailoring the fundamental pulse. The SHG spectrum can be compressed into a narrowband signal with lower background by modulating the relative phases between the frequency components within the fundamental pulse, inducing constructive interference at the center frequency and destructive interference elsewhere. Multipeak second harmonic signals can also be obtained by properly modulating various interference pathways. These results have potential applications in high resolution nonlinear spectroscopy, microscopy, and information coding.