A novel scheme for making absolute wavelength measurements with a grating spectrograph is proposed. A grating with special multiple rulings is illuminated with a reference laser of known wavelength to project a ruler-like diffraction pattern of equidistant wavelength calibration lines directly onto the unknown spectrum.
© 1977 Optical Society of America
Original Manuscript: August 15, 1977
Published: December 1, 1977
T. W. Hänsch, "Measuring the wavelength of light with a self-calibrating grating," Opt. Lett. 1, 191-193 (1977)