激光损伤阈值测试.docx

Laser Damage Threshold Testing
Laser Damage Threshold (LDT) is one of the most important specifications to consider whe comparison between optical components from different manufacturers.
Edmund Optics' LDT testing is conducted by irradiating a number of test sites with a laser beam at different energy densities for pulsed lasers, or different power densities for CW lasers. The energy density or power density is incrementally increased at a minimum of ten sites at each increment. The process is repeated until damage is observed in 100% of the irradiated sites. The LDT is the highest energy or power level at which no damage is observed in any of the irradiated sites. Inspection of the sites is done with a Nomarski-type Differential Interference Contrast (DIC) microscope with 100X - 150X magnification. Visible damage is observed and the results are recorded using pass/fail criteria. Figure 1 is a typical damage probability plot of exposure sites as a function of laser pulse energy.
In addition to uncoated optical components, optical coatings are also subject to damage from the presence of absorption sites and plasma burn. Figure 2 is a real-world image of coating failure due to a coating defect. For additional information on the importance of LDT testing on coatings, view The Complexities of High-Power Optical Coatings.
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Exposure Histogram
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