Laser damage thresholds of fluoride HR coating were investigated at 352 nm, 10 ns pulses. Additionally, an effective method to reduce the crazing in fluoride HR coatings is studied. A high threshold greater than 30 J/cm$+2$/ was achieved in LaF$-3$//AlF$-3$/ coating when the laser conditioning procedure was used. The IAD process or double stack design with a combination of fluoride and HfO$-2$/SiO$-2$/ coating was effective in reducing the crazing.
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