Abstract
Distributed dissipation in optical parametric processes has attracted renewed interests recently due to its rich physics including modulation instability, gain broadening, unidirectional energy transfer etc. Due to difficulties in practical implementation, lumped dissipation are investigated in this work as an alternative approach which can be realized more conveniently. Strong similarities are found between lumped and distributed dissipation. While distributed losses contribute to non-hermitian phase matching, lumped dissipation is shown to be a simple and universal quasi-phase matching method. Experimental validations of gain broadening and flattening in normal and anomalous dispersion regions are presented. As an application to wavelength conversion, enlarged conversion bandwidth when dissipation is introduced to the signal wave is revealed.
Highlights
The idea of harvesting gain through dissipation in optical parametric processes has attracted renewed interests recently [1]–[6] due to its rich physics including modulation instability in normal dispersion regime [1], optical parametric amplification (OPA) enabled by non-hermitian phase matching [2], high conversion efficiency in chirped pulse amplification [3], related applications to optical parametric oscillation [7] and optical frequency comb generation [4] etc
While distributed losses contribute to non-hermitian phase matching, lumped dissipation is shown to be a simple and universal quasi-phase matching method
While distributed losses contribute to non-hermitian phase matching [2], it will be shown that the role of lumped dissipation is to provide quasi-phase matching (QPM)
Summary
The idea of harvesting gain through dissipation in optical parametric processes has attracted renewed interests recently [1]–[6] due to its rich physics including modulation instability in normal dispersion regime [1], optical parametric amplification (OPA) enabled by non-hermitian phase matching [2], high conversion efficiency in chirped pulse amplification [3], related applications to optical parametric oscillation [7] and optical frequency comb generation [4] etc. Note that various schemes of QPM in case of third order OPA have been reported, such as rearranging the nonlinear media [9], dispersion compensation [10], introducing distributed gratings [11], segmenting optical path into smaller sections and adding phase adjustments in between [12] etc. Compared to these schemes, QPM based on lumped dissipation is simple and universal in the sense that it is transparent to original characteristics of the nonlinear media, interacting wavelength etc., highlighting the compatibility of the scheme
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