We have designed and tested an automated simple setup for quickly measuring the profile spot size of a Gaussian laser beam using three cost-affordable light sensors. Two profiling techniques were implemented: imaging CMOS 2D array (webcam) scanning knife-edge-like single photodiode LDR. The methods sensors compared to determine their accuracy lasers two different wavelengths technologies. verif...

A narrow-linewidth laser with excellent temporal coherence is an important light source for microphysics, space detection, and high-precision measurement. An ultranarrow-linewidth output a linewidth as narrow subhertz has been generated theoretical length over millions of kilometers. Traditional grating spectrum measurement technology wide wavelength scanning range extended dynamic range, but t...