Enhanced Optical Limiting Performance of GaN Nanofluids: Achieving High Modulation Depth Despite Lower Two-Photon Coefficient

Although the two-photon coefficient is numerically smaller than that of femtosecond and picosecond pulse bulk gallium nitride, the experiment shows a larger modulation depth. The maximum transmittance is 23%, and the minimum transmittance is 75%. Considering the low substance concentration of the dispersion liquid, this indicates excellent optical limiting performance.