BI-CONCAVE LENSES DAR@1510-1610nm

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Optical Fiber Communication: The 1550nm band (which includes 1510 nm to1610 nm) is a critical window for long-haul optical communications because optical fibers have minimal signal loss at these wavelengths. Lenses with DAR coatings in this range are used to couple lasers into fiber optics, or to collimate light coming out of a fiber.

Lasers operating at 1510 nm to 1610 nm can be combined for specific applications like telecommunications (where these wavelengths are critical for optical fiber communication) or medical research. The coating ensures minimal loss for both beams.

Bi-Concave lenses have a negative focal length and are best used to diverge a converging beam. Similar to a Plano-Concave lens, a Bi-Concave lens can diverge a collimated beam to a virtual focus as used in a Galilean type beam expander.
But it is usually preferrable to choose a bi-concave lens if the absolute conjugate ratio (object distance divided by image distance) is close to 1. When the desired absolute magnification is either less than 0.2 or greater than 5, the tendency is to choose a plano-concave lens instead.

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