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Universal strategies for enhancing the laser energy loading capability of pulse compression gratings
To analyze the mechanism of damage threshold enhancement after laser conditioning, the fluorescent and stimulated Raman scattering properties of unconditioned and laser-conditioned KD2PO4 crystals are compared in detail. It is revealed that the intensity of fluorescence decreases significantly, especially fluorescence <400 nm, after nanosecond laser conditioning, and the change of the stimulated Raman scattering peak at 921 cm − 1 is very weak. Moreover, the intensity of fluorescence further decreases after subnanosecond laser conditioning. A sharp decrease in the fluorescence intensity <400 nm reflects a change in energy levels of the electron defects in a crystal. The Raman scattering proves very weak change of the PO4 vibrational modes. Furthermore, a laser-conditioning mechanism is discussed in combination with electronic transition and thermal processes.
Optimizing the flow conditions of the horizontally oriented DKDP crystal by adding a stirring paddle
Near-field optical characteristics of sub-wavelength grating irradiated by ultra-short optical pulse
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