49-036 12.5 mm Dia. Traditional Coated OD 2.0 Longpass Filter; t=1.5mm 1000nm

The 49-036 is a Longpass Filter, a type of optical filter that passes longer wavelengths of light and blocks shorter wavelengths, from the renowned vendor Edmund Optics. This particular model boasts a 12.5 mm diameter and a thickness of 1.5mm, making it suitable for a wide range of optical applications.

The filter is designed to cut on at 1000nm, meaning it begins to transmit light at this wavelength, and continues to transmit longer wavelengths. Conversely, it blocks all wavelengths shorter than its cut-on point. This characteristic makes it ideal for applications where the detection of longer wavelengths is required, such as infrared (IR) spectroscopy or photography.

The 49-036 filter features a traditional coating on both the front and back surfaces. This coating enhances the filter's performance by reducing surface reflections and improving transmission. The coating also provides mechanical protection to the filter, making it more durable and resistant to scratches and other forms of damage.

The filter's geometry is defined by its thin lens shape, which contributes to its versatility and ease of integration into various optical systems. The catalog number for this item is 49-036, and it is currently in stock, according to the vendor's website.