The traditional contact measuring methods could not satisfy the current optical elements measuring requirements. Noncontact
high precision measuring theory, principle and instrument of the surface form tolerances and central thickness for
optical elements were studied in the paper. In comparison with other types of interferometers, such as Twyman-Green
and Mach-Zehnder, a Fizeau interferometer has the advantages of having fewer optical components, greater accuracy,
and is easier to use. Some relations among the 3/A(B/C), POWER/PV and N/ΔN were studied. The PV with POWER
removed can be the reference number of ΔN. The chromatic longitudinal aberration of a special optical probe can be
used for non-contanct central thickness measurement.
The design of laser beam performance test system is a technique consists of optics, mechanism, electricity, computer and
so on. The design and measure methods of the laser beam performance test system in this paper are according to the
ISO laser and laser-related equipment international standard (ISO 1146). This test system consists of laser energy
meter, oscilloscope, high speed photoelectric detector, CCD, laser attenuator, neutral attenuator, PCI image grabbing
card, focal optical system, beam analysis process software and so on. The laser beam performance parameters tested by
the system include spatial characteristic parameters, temporal characteristic parameters, laser output energy and so on.
Spatial characteristic parameters include beam spot two-dimensional distribution, light-intensity three-dimensional
distribution, beam divergence angle, beam direction stability and so on. Temporal characteristic parameters include
laser pulse width and repetition frequency. At last a laser was tested and the result was satisfied.