The FP-WLFE-NIR from LD-PD Inc is a Fabry-Pérot Interferometer that has a spectral response of 1.3 µm - 2 µm. It has a clear aperture size of 22.9 mm and diameter of 25.4 ± 0.05 mm. This multi-beam interferometer has a surface quality of 60 - 40, parallelism of 5 - 10 arc sec, and end surface flatness of 1/10 lambda. It has a copper tube that measures 100 ± 0.2 mm (length) and is ideal for wavelength locker, handheld spectrum analyzer, fiber bragg grating sensing systems, tunable filter laser, tunable filter, and wavelength division multiplexing telecommunication network applications.