Laser induced damage for diamond films

The outstanding optical and mechanical properties of diamond films are summarized. Laser damage for films irradiated with different wave lengths and pulse width are reviewed and the laser damage mechanism analyzed for different parameters. It is found that graphitization induced instability of the crystal lattice is the main reason for laser induced damage. There are two ways that lead to graphitized damage on the surface of diamond films under long and short laser pulses. For nanosecond or longer laser pulses, graphitization propagates vertically into the bulk of the diamond films. For femtosecond laser pulses, graphitization occurs on the surface of the diamond films layer by layer. Based on the physical properties and preparation technology, practical and promising applications of diamond films are proposed.