BS EN ISO 11146-2:2021 Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios. General astigmatic beams
2021BS EN ISO 11146-2:2021 Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios. General astigmatic beams
2005BS EN ISO 11146-2:2005 Lasers and laser-related equipment - Test methods for laser beam widths, divergence angles and beam propagation ratios - General astigmatic beams