[SURFACE SAMPLE]

Newport FRQ-ND02

Absorption   22.2%  at 1064 nm

pump power damage threshold 40mW

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Type UV Fused Silica Metallic ND Filter   ---> Inconel coated fused silica substrate

Optical Density                    0.2 at 633 nm 

Diameter                              1.0 in. (25.4 mm)

Thickness                            0.118 in. ( 3.0 mm)

Material                                UV grade fused silica

Surface Quality                    60-40 scratch-dig

Surface Flatness                  less than 1 lambda at 632.8 nm over the clear aperture

Wedge                                  less than 3 arc min

Wavelength Range              350 - 2000 nm

Diameter Tolerance             ±0.25 mm

Thickness Tolerance            ±0.25 mm

Clear Aperture                      central 80% of dimensions

Damage Threshold               30 W/cm2 CW, typical;

                                              not recommended for pulsed laser use

Angle of Incidence                0 degree

Transmission                        63.1 % at 632.8 nm

Optical Density Tolerance    ±7%

Chamfers                              0.25-0.76 mm face width

Chamfers Angle/Tolerance   45 ±15 degree

Cleaning                                Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended

[BULK SAMPLE]

Schott glass NG-12

Thickness                                      3.6 mm

Absorption rate                              116% /cm

Refractive index                             1.48 at 1014 nm

Pump power damage threshold     100 mW

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Absorption = 1.16 /cm * 0.36 cm = 0.418 = 41.8%