Would appreciate for sharing the trustworthy references for measured nonlinear refractive index for fused silica (quartz) for femtosecond laser pulses preferably in the region of 800nm wavelenght with around 120fs pulse duration. After checking the literature been found that the quartz value for n2 differs for several times (excluding quite strange values) but somehow is of the order of 10(-16) cm2/W. Thank you.