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Above cryogenic temperatures, random laser (RL) emission under continuouswave (CW) optical pumping is often challenging for materials having plenty oflattice defects. Thus, intensive care is required while fabricating the RLdevice. Synthesis of 2D materials having unique functionality at the atomiclimit is necessary for use in such devices. In this work, defects-free 2Dyellow pearl (2D-YP) has been synthesized from bulk south sea pearl usingliquid-phase exfoliation (LPE) technique. Thereafter, 2D-YP has been employedas passive scatterer to achieve CW pumped RL emission from a conventional gainmolecule, i.e., Rhodamine B (RhB). Compared to other semiconductor (TiO2) and2D (Graphene and h-BN) passive scatterers, ~25 times improvement in gain volumeis observed for the disordered system consisting of RhB and 2D-YP, i.e.,2D-YP@RhB, which is found to be due to the formation of a large refractiveindex gradient, as induced by the thermal nonlinear optical (NLO) interaction.Hence, incoherent RL (ic-RL) emission ~591 nm is reported for 2D-YP@RhB at alowest threshold input pump power and a linewidth of 65 mW and 3 nm,respectively. Additionaly, a clear transition from ic-RL to mode tunablecoherent RL (c-RL) emission is also possible by altering the configuration ofthe 2D-YP@RhB container. Therefore, the newly designed Van der Waalsheterostructure, i.e., 2D-YP with intrinsic photon trapping capability may pavean avenue towards developing future exciting optoelectronic devices.

Atomically Thin Yellow Pearl: An Impetus for Thermal Nonlinear Optical Effect Assisted Continuous Wave Random Lasing