# 1″ Diameter AR-Coated Optical Germanium(Ge) Crystal Wafers

> 1" Diameter AR-Coated Optical Germanium(Ge) Crystal Wafers — a sapphire / specialty wafer: Optical Glass, 1.0+/-0.1mm thick, HMC. Specs, RFQ checklist and…

- Page: https://machiningglass.com/products/1-diameter-ar-coated-optical-germaniumge-crystal-wafers/
- SKU: MG-6B5E03
- Category: Glass & Quartz Wafers > Sapphire & Specialty Optical Wafers
- Image: https://machiningglass.com/wp-content/uploads/2026/10/1-Diameter-AR-Coated-Optical-Germanium-Ge-Crystal-Wafers.webp
- Updated: 2026-10-24

Product type: Flat Lens. Application: Lighting, Medical, Optical, Photography, Astronomy.

## Overview

1" Diameter AR-Coated Optical Germanium(Ge) Crystal Wafers is a sapphire / specialty wafer made from Optical Glass. Listed geometry: diameter 25.4+0.0/-0.2mm, thickness 1.0+/-0.1mm, single-lens shape. Optical / electrical data: transmittance 90%-95%. Coating: HMC. Listed for Lighting, Medical, Optical, Photography and Astronomy applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Optical Glass |
| Type | Flat Lens |
| Shape | Single-lens |
| Diameter | 25.4+0.0/-0.2mm |
| Thickness | 1.0+/-0.1mm |
| Transmittance | 90%-95% |
| Coating | HMC |
| Parallelism | <0.05mm |
| Clear Aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Lenses Color | Clear |
| ROC1 | Infinity |
| ROC2 | Infinity |
| Chamfer | Protected |
| Standard | MIL-PRF-13830B |
| CPG is also an ISO | 9001&14001 certified manufacture, we deliver fast and provide best cost performance ratio for our customers. |
| Package detail | Optics are packed with Capacitor paper, white paper, custom-made plastic containers etc |
| Supplier | CPG OPTICS LIMITED |

## Technical data

|   |   |   |
| --- | --- | --- |
| Items | Description |  |
| Germanium Window | Material: | Germanium,monocrystal |
| Diameter: | 25.4+0.0/-0.2mm |  |
| Thickness: | 1.0+/-0.1mm |  |
| ROC1: | Infinity |  |
| ROC2: | Infinity |  |
| Surface quality: | S1&S2:5/5x0.16;L5x0.025 |  |
| Parallelism: | <0.05mm |  |
| Clear Aperture: | >90% |  |
| Chamfer: | Protected |  |
| Standard: | MIL-PRF-13830B |  |

## What to specify when you request a quote

- **Diameter and flat / notch** — listed as “25.4+0.0/-0.2mm”; state diameter, flat or notch and their tolerances.
- **Thickness and TTV** — listed as “1.0+/-0.1mm”; give thickness, its tolerance and total thickness variation.
- **Polish and roughness** — specify single- or double-side polish and roughness.
- **Flatness, bow and warp** — quote flatness, bow and warp limits.
- **Material grade** — listed as “Optical Glass”; name the grade (JGS1/JGS2, Borofloat 33, alkali-free, sapphire orientation).

## Engineering guides for this part

For material grades and coating options, see [Fused Quartz Wafer Substrate Selection: Materials & Coatings for Semiconductor and Optical Systems](https://machiningglass.com/materials/fused-quartz-wafer-substrate-selection-materials-coatings-for-semiconductor-and-optical-systems/). How parts like this are machined and finished is covered in [Precision Glass Hole Drilling & Micromachining for MEMS Wafers](https://machiningglass.com/capabilities/precision-glass-hole-drilling-micromachining-for-mems-wafers/). For an application example, read [AR Coated Glass for Appliance Touch Screens: Specs and Selection](https://machiningglass.com/applications/ar-coated-glass-for-appliance-touch-screens-specs-and-selection/). A related standard product is [AR-Coated High-Transparency Optical Glass](https://machiningglass.com/products/ar-coated-high-transparency-optical-glass/).

## FAQ

### What is the 1" Diameter AR-Coated Optical Germanium(Ge) Crystal Wafers made of?

It is listed as Optical Glass. Coating: HMC. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### What sizes and thicknesses are available?

The listing gives diameter 25.4+0.0/-0.2mm, thickness 1.0+/-0.1mm. Custom outlines and thicknesses are made to drawing; state the tolerance you need.

### What optical or electrical performance does it have?

Listed values: transmittance 90%-95%. Confirm the values at your operating wavelength, angle and temperature when you request a quote.

### Where is this sapphire / specialty wafer used?

Listed applications: Lighting, Medical, Optical, Photography and Astronomy.

### What should I include in a quote request?

Include diameter and flat / notch, thickness and ttv, polish and roughness, flatness, bow and warp and material grade, plus quantity and a drawing if the part is custom.

## Request a quote

Send drawings, tolerances and quantity: https://machiningglass.com/contact/?rfq_product_id=7747#mg-rfq

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Source: Custom Precision Glass Machining — https://machiningglass.com/