FDSP780 In Stock

The FDSP780 by ThorLabs is a highly specialized and efficient pigtailed silicon photodiode that is specifically designed for light detection within the visible to near-infrared range. The FDSP780 has been developed to provide low dark current and terminal capacitance with increased bias voltage, making it ideal for optical communications, high-speed photometry, and monitoring applications.

The FDSP780's housing is made of a sturdy stainless steel bushing, which is utilized for active coupling of the fiber to the photodiode. The fiber, reinforced with a Ø900 μm loose tube outer jacket and a rubber boot, ensures the prevention of fiber bending stresses. The Nufern 780-HP single-mode fiber with a core diameter of 5 μm and a numerical aperture of 0.13 is used in the FDSP780, making it highly suitable for measurements of pulsed or CW fiber-coupled light sources by converting optical power into an electrical current. The photodiode's conversion coefficient, also known as responsivity, is wavelength-dependent.

The FDSP780 is characterized by a single fiber that is actively aligned for optimum coupling efficiency, sensitivity, and stability. The single-mode fiber is highly effective in suppressing mode interferences, which is essential for signal detection in fiber-based interferometers. This photodiode has been designed for low back reflection and is specified for use at 780 nm - 970 nm. Moreover, the FDSP780 features a low bias voltage and a numerical aperture of 0.13.