The low numerical aperture multimode fiber project is a detailed fiber design and simulation developed by a team of undergraduate senior students. As such, the inputs were determined through discussion with our project customer, ASML. We are designing a fiber to support ASML’s YieldStar (YS) optics sensor for scanning wafers using white light with the wavelength range of 400 to 1000 nm and another fiber to operate at a wavelength of 1070 nm meant to preheat a mirror for a separate lithography machine.