Custom Quartz Windows

Parameter	Available configuration
Standard diameter / outline	Ø5–300 mm; square / rectangular outlines by drawing
Standard thickness	0.5–25 mm
Standard surface quality / figure	60/40 scratch-dig; λ/4 at 633 nm
Precision optical option	40/20 · λ/10 at 633 nm; 20/10 surface quality by order
Standard parallelism	≤3 arcmin; clear aperture defined on drawing
Large-aperture observation line	Ø100–800 mm; figure λ/10; parallelism 0.02 mm; thickness tolerance ±0.02 mm; catalog surface finish 40/60

Inquiry

Quartz windows are polished optical interfaces for UV, visible and infrared instruments. Standard optical windows and large-aperture observation windows are quoted as separate series.

Ø5–300 mmStandard Diameter

0.5–25 mmStandard Thickness

60/40Standard Surface

λ/4 @633 nmStandard Figure

λ/10 @633 nmPrecision Figure

Ø100–800 mmLarge Observation Line

Engineering Data

Optical Grades for the Standard Window Series

Grade	Surface quality	Surface figure	Inspection
Standard	60/40	λ/4	633 nm over agreed clear aperture
Precision / Ultra	40/20	λ/10	633 nm over agreed clear aperture
Enhanced surface option	20/10 by order	λ/10 by order	Aperture and method agreed on drawing

Engineering Data

Large-Aperture Observation Windows

A separate Ø100–800 mm observation-window line is available with parallelism 0.02 mm, thickness tolerance ±0.02 mm and surface figure λ/10. The catalog lists surface finish as 40/60; this is an original catalog notation, and the surface evaluation method and acceptance value must be stated on the purchase drawing. It is not used as a scratch-dig grade in the standard optical table. Thickness, reference wavelength and measured aperture are specified for the large-window order.

Engineering Data

Mounting and Optical Acceptance

Define physical diameter, clear aperture, edge bevel, seal land, pressure duty and coating face separately. Surface figure is evaluated over the stated clear aperture; use 633 nm as the standard-series reference unless the drawing specifies another wavelength. Large diameters and the tightest optical options require joint review of thickness, aperture and mounting load.

Engineering Data

Material Selection

Electric-Fused QuartzGrade-specific UV cut-offOH 5–150 ppm; heat treatment can adjust OH. General-purpose continuously drawn stock. Confirm UV boundary by grade datasheet.

Flame-Fused Quartz · JGS2220–2500 nmOH 120–260 ppm; UV-visible optical components.

Synthetic Fused Silica · JGS1185–2500 nmSiO₂ ≥99.999%; OH ≈1000 ppm. Selected for deep-UV transmission; strong OH absorption near 2730 nm.

Vacuum-Fused / Low-OH · JGS3Grade-specific UV–IR / 260–3500 nmVacuum-fused OH <3 ppm; JGS3-class OH ≤10 ppm. Use the lot certificate and transmission curve at the working thickness.

OH content varies by grade and batch; the lot certificate is authoritative. Compare material routes and typical transmission data.

Engineering Data

Material and Temperature Guidelines

Electric-fused / flame-fused quartz: SiO₂ ≥99.99%; synthetic JGS1-grade fused silica: ≥99.999%. Grade and lot certificate govern supplied material.

Transparent quartz: continuous use ≤1100 °C; short-term excursions ≤1200 °C. Opaque / milky quartz: continuous use ≤1000 °C. Load, atmosphere, support span and thermal cycling determine the application limit.

Engineering Data

Frequently Asked Questions

Is λ/4 the best available figure?

λ/4 at 633 nm is the standard-series figure. Precision / Ultra windows use λ/10 at 633 nm with 40/20 surface quality; 20/10 surface quality is an enhanced option specified by order.

What must be stated for λ/10 acceptance?

State the reference wavelength, surface figure or transmitted wavefront, peak-to-valley or RMS metric, measurement aperture, mounting condition and test method.

Product Examples