Laser wavemeter with solid Fizeau wedge interferometer

A Fizeau wavemeter using a solid Fizeau wedge interferometer that is suitable for determining the wavelength of pulsed or cw laser light has been modeled and investigated experimentally. Accuracy of a few parts in 10(6) over a wide wavelength range can be achieved with careful design. Experimental accuracy of 2 parts in 10(6) was demonstrated over a range of 40 nm.