Abstract:
Holographic gratings with line frequencies 2100 and 2500 mm–1 were optimized in respect of the relative diffraction efficiency at grazing incidence for their use in dye lasers. A suitable selection of the exposure and development conditions made it possible to reach an absolute efficiency of 0.2 for an angle of incidence 89°, which was close to the theoretical value. The diffraction characteristic of the gratings with the line frequency 2100 mm–1 exhibited an anomaly at the wavelength of 488 nm. The gratings with the line frequency 2500 mm–1 were preferable in the tuning range because of the more uniform wavelength dependence of the efficiency.