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We propose to use frequency-selective quasi parity-time symmetry to reducethe heat generated by coherent anti-Stokes Raman scattering (CARS) reversedcycles in active Raman media with phase mismatch. This is accomplished using acoupled-waveguide structure, which includes the active Raman waveguide (RW),where the Stokes signal undergoes amplification via stimulated Stokes Ramanscattering (SSRS), and a dissipative waveguide (DW), which is tuned to theanti-Stokes wavelength so as to evacuate the corresponding anti-Stokes photonsfrom the RW by coupling. The DW introduces optical loss that partially offsetsthe growth of the anti-Stokes signal in the RW and hence suppress the reversedCARS cycles that would otherwise result into heat generation in the RW. It isshown that the frequency-selective quasi parity-time symmetry provided by theDW can reduce the heat in active Raman media by a very factor of up to fivewhen the CARS phase mismatch is compensated for by the optimum level ofcoupling between the RW and the DW.

Heat Evacuation from Active Raman Media Heat Evacuation from Active Raman Media Using Quasi-PT Symmetry Coupling