Both Laser Quality and Analytical Quality flat Square Optical Windows designated as LQ (Laser Quality) and AQ (Analytical Quality) are available in UV Grade Fused Silica (FS) & BK7 Glass.  Square Optical Windows are flat polished optical windows typically used to isolate environments while allowing light to pass relatively unimpeded.   Square Optical Windows are generally used for coating substrates or as cover plates to protect other components within an optical assembly, instrument or laser. 

For more information about Optical Windows, refer to our Optics Tutorial page. 

OPTICAL WINDOW SPECIFICATIONS Material : BK7 Glass & UV Grade Fused Silica (FS)      Size Tolerance: ± 0.25mm Thickness Tolerance: ± 0.25mm   Surface Figure:  LQ =L/10 @ 633 nm nominal                        AQ = ~5 waves @ 633 nm nominal Surface Finish: LQ = 10-5 both surfaces                        AQ = 60-40 both surfaces Clear aperture: central 85% Parallelism: LQ = < 5 arc minutes                   AQ = < 15 arc minutes  Chamfer: ~ 0.30mm @45 deg. (LQ = Laser Quality / AQ = Analytical Quality) All dimensions in mm

SIZE (S)  (mm)	THICKNESS (T)       (mm)	QUALITY	MATERIAL	PRODUCT #	PRICE	ORDER
12.7	6.4	Laser Quality Window	BK7	LQB1264SW	$125.00	LQB1264SW
12.7	6.4	Laser Quality Window	Fused Silica	LQF1264SW	$145.00	LQF1264SW
25.4	2.0	Laser Quality Window	BK7	LQB2520SW	$175.00	LQB2520SW
25.4	1.6	Analytical Quality Window	BK7	AQB2516SW	$45.00	AQB2516SW
25.4	2.0	Laser Quality Window	Fused Silica	LQF2520SW	$190.00	LQF2520SW
25.4	1.6	Analytical Quality Window	Fused Silica	AQF2516SW	$50.00	AQF2516SW
25.4	6.4	Laser Quality Window	BK7	LQB2564SW	$175.00	LQB2564SW
25.4	6.4	Analytical Quality Window	BK7	AQB2564SW	$45.00	AQB2564SW
25.4	6.4	Laser Quality Window	Fused Silica	LQF2564SW	$190.00	LQF2564SW
25.4	6.4	Analytical Quality Window	Fused Silica	AQF2564SW	$60.00	AQF2564SW
38.1	9.5	Laser Quality Window	BK7	LQB3895SW	$200.00	LQB3895SW
38.1	9.5	Analytical Quality Window	BK7	AQB3895SW	$55.00	AQB3895SW
50.8	2.0	Laser Quality Window	BK7	LQB5020SW	$360.00	LQB5020SW
50.8	1.6	Analytical Quality Window	BK7	AQB5016SW	$60.00	AQB5016SW
50.8	2.0	Laser Quality Window	Fused Silica	LQF5020SW	$450.00	LQF5020SW
50.8	1.6	Analytical Quality Window	Fused Silica	AQF5016SW	$100.00	AQF5016SW
50.8	5.0	Laser Quality Window	BK7	LQB5050SW	$360.00	LQB5050SW
50.8	4.8	Analytical Quality Window	BK7	AQB5048SW	$80.00	AQB5048SW
50.8	5.0	Laser Quality Window	Fused Silica	LQF5050SW	$450.00	LQF5050SW
50.8	4.8	Analytical Quality Window	Fused Silica	AQF5048SW	$120.00	AQF5048SW
50.8	6.4	Laser Quality Window	BK7	LQB5064SW	$360.00	LQB5064SW
50.8	6.4	Analytical Quality Window	BK7	AQB5064SW	$85.00	AQB5064SW
50.8	6.4	Laser Quality Window	Fused Silica	LQF5064SW	$450.00	LQF5064SW
50.8	6.4	Analytical Quality Window	Fused Silica	AQF5064SW	$125.00	AQF5064SW
50.8	9.5	Laser Quality Window	BK7	LQB5095SW	$360.00	LQB5095SW
50.8	9.5	Analytical Quality Window	BK7	AQB5095SW	$90.00	AQB5095SW
50.8	9.5	Laser Quality Window	Fused Silica	LQF5095SW	$450.00	LQF5095SW
50.8	9.5	Analytical Quality Window	Fused Silica	AQF5095SW	$140.00	AQF5095SW
76.2	9.5	Laser Quality Window	BK7	LQB7695SW	$740.00	LQB7695SW
76.2	9.5	Analytical Quality Window	BK7	AQB7695SW	$110.00	AQB7695SW
76.2	12.7	Laser Quality Window	BK7	LQB7613SW	$740.00	LQB7613SW
76.2	12.7	Analytical Quality Window	BK7	AQB7613SW	$115.00	AQB7613SW

            · Add a Laser Quality AR Coating to any "LQ" Product # Window above...

            · AR Coatings for all Analytical Quality "AQ" Product # Windows are
                          available ONLY by special Request

             · Larger standard "AQ" Square Window sizes such as

                  101.6mm, 127.0mm & 152.4mm square are available by Request

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