Coherent population trapping (CPT) in atomic vapors using all-optical interrogation has enabled the miniaturization of microwave clocks. Light shifts induced by CPT driving fields can impact spectral profile resonances and are a common limit to long-term stability Nonlinear light have been observed several systems not explored detail. In this Letter, we demonstrate that nonlinear clocks arise f...

Anti-reflection coatings (ARC) of dielectrics help in balancing the refractive index mismatch between silicon and air as result reducing the reflection losses but they do not cause bending of light rays which is essential for efficient light trapping of the injected light into the cell. Texturiaztion helps in both the reduction of reflection losses and light trapping due to bending of the light...