Any standard Optometrics grating is available with either P-type or CW-type construction, for higher damage threshold performance.

Damage Thresholds: (no damage threshold minimums apply to gratings with an overcoat)

Standard Replica Gratings:
Pulsed:  350 millijoules/cm² @ 200 ns
CW:        40 watts/cm²

P-Type Replica Gratings: (pulsed type)
Pulsed:  3.5 joules/cm² @ 200 ns
CW:        80 watts/cm²

CW-Type Replica Gratings: (for continuous high power applications)
Pulsed:  3.5 joules/cm² @ 200 ns
CW:        250 watts/cm²

Coatings
Regardless of size, the additional cost per piece is:

Gold Overcoat (part number AU-3)                                        $60.00
Aluminum Magnesium Fluoride (part number ALMG-3)   $55.00

Note: While a gold overcoat can increase reflectivity, any overcoating may reduce the damage threshold by a factor of two or more.