Optical Standards Near-Infrared Standards for use in the 10,000 cm⁻¹ to 4,000 cm⁻¹ (1,000nm to 2,500nm) wavelength range. Mid-Infrared Standards for use in the 4,000 cm⁻¹ to 400 cm⁻¹ wavelength range. UV-Visible Standards for use in the 200nm to 1000nm wavelength range.