68-736 20 mm Dia. Germanium Protective Flat Window; t=2 mm Uncoated

The 68-736 is a 20 mm diameter Germanium Flat Window with a thickness of 2 mm, uncoated and sourced from Edmund Optics. This window is a circular, thin lens type of optical element, designed to protect other optical components from environmental hazards while minimally affecting the light path.

The window is made of Germanium, a material with the ID "germanium burnett". Germanium is a high-index material, making it suitable for use in infrared applications. The wavelength specified for this window is 587.6 nm, which is in the visible light spectrum, although Germanium's high transmissivity in the infrared range is its primary advantage.

The window is uncoated, meaning it does not have any additional layers to enhance its properties. While coatings can be beneficial for reducing reflections, increasing transmission, or providing environmental protection, an uncoated window can be advantageous in certain applications where cost, simplicity, or specific optical properties are a priority.

The window's geometry, with a diameter of 20 mm and a thickness of 2 mm, is designed to balance between robustness and minimal impact on the light path. The thinness of the window ensures that it does not introduce significant aberrations or distortions to the light passing through it.