Advantages of Dichroic Filters
- Much better filtering characteristics than conventional filters
- Ability to easily fabricate a filter to pass any passband frequency and block a selected amount of the stopband frequencies (saturation)
- Because light in the stopband is reflected rather than absorbed, there is much less heating of the dichroic filter than with conventional filters
- Much longer life than conventional filters; the color is intrinsic in the construction of the hard microscopic layers and cannot "bleach out" over the lifetime of the filter (unlike for example, gel filters)
- Filter will not melt or deform except at very high temperatures (many hundreds of degrees Celsius)
- Capable of achieving extremely high laser damage thresholds (dichroics are used for all the mirrors on the world's most powerful laser, the National Ignition Facility)
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