论文信息 - Effect of electron tunnelling to laser induced damage properties of optical coatings

Effect of electron tunnelling to laser induced damage properties of optical coatings

We present a model to describe the mechanism of laser induced electronic damage in optical coatings. Different from the classical laser damage models, the electron tunneling effect is taken into account in our model. The diffusion of free electron in the conduction band is enhanced if free electron tunnel effect happens in the optical coatings. Under some specific circumstance, the electron tunneling effect will make a great impact on the laser induced damage properties of the optical coatings. Under radiation of different duration and different power intensity lasers, the influence of free electron tunnel to the laser induced damage threshold is also different. Based on the calculation results, the tunnel effect can influence the laser induced damage properties of optical coating system at nanosecond and picosecond regime. In the femtosecond regime, the influence of the tunnel effect can be neglected.

[1] L. Keldysh,et al. IONIZATION IN THE FIELD OF A STRONG ELECTROMAGNETIC WAVE , 1964 .

[2] M. Feit,et al. Effect of refraction on spot-size dependence of laser-induced breakdown , 1974 .

[3] Tian-qing Jia,et al. Photon absorption of conduction-band electrons and their effects on laser-induced damage to optical materials , 2000 .

[4] T. Jia,et al. Microscopic mechanisms of ablation and micromachining of dielectrics by using femtosecond lasers , 2003 .

[5] B. Rethfeld,et al. Unified model for the free-electron avalanche in laser-irradiated dielectrics. , 2004, Physical review letters.

[6] D. Feng,et al. Mechanisms in fs-laser ablation in fused silica , 2004 .

[7] B. Rethfeld,et al. Free‐Electron Generation in Laser‐Irradiated Dielectrics , 2006, SPIE High-Power Laser Ablation.

[8] Laurent Gallais,et al. Investigation of nanodefect properties in optical coatings by coupling measured and simulated laser damage statistics , 2008 .

[9] Kai Starke,et al. Laser damage thresholds of optical coatings , 2009 .

[10] Valdas Sirutkaitis,et al. Calculations and experimental demonstration of multi-photon absorption governing fs laser-induced damage in titania. , 2009, Optics express.

[11] Stavros G. Demos,et al. Strong nonlinear growth of energy coupling during laser irradiation of transparent dielectrics and its significance for laser induced damage , 2011 .