As far as I know, beam spliter in thorlabs can pass either visable light (wave length 400-700 nm) or near infrared light(700nm - 1100 nm) and light out of the range will soon decrease. And it seems unreasonable to catch both visable light and near infrared light.
AnimationFan
commented
2 years ago 
As far as I know, beam spliter in thorlabs can pass either visable light (wave length 400-700 nm) or near infrared light(700nm - 1100 nm) and light out of the range will soon decrease. And it seems unreasonable to catch both visable light and near infrared light.