This paper is a stage report of the research on new laser ceramic alloying pistion ring.

For reducing abrasive wear, the air filter has been improved to meet the environmental requirements of desert vehicles, and some high wear resistant engine parts, such as ceramic coating piston ring and ceramic alloying piston ring in coupling with ceramic coating cylinder liner, have been proved in engine bench test with simulated desert environment and in desert vehicle application.

Some important transparent ceramics such as infrared ceramics,laser ceramics and scintillator ceramic were introduced and the developing trends were overviewed briefly.

So the new application of transparent polycrystalline ceramics would be exploited as laser ceramics.

The defects create optical scattering and absorption centers in laser ceramics, and also exert an influence on the thermal and mechanical properties of the materials.

The development of mode-locked ceramic laser with semiconductor absorber;

Based on Siegman rate equations,the output properties of Cr4+∶Nd3+∶YAG self-Q-switched ceramic laser are numerically analyzed with the method of self-doped RungeKutta.

With uniformly side-around arranged compact pumping structure, high conversion efficiency operating of diode-laser-array side-pumped Nd∶YAG ceramic laser was demonstrated.