We describe a study of single/few pulse machining of glass with 150fs pulses at 800nm (Ti:sapphire) and present results demonstrating in a quantitative way the dependence of the machining quality on the focal position and the pulse energy of the laser beam. We report experimental results on how sub-diffraction limited structures can be created. A theoretical calculation of the ablation threshold of glass is made from our experimental results, found to be 5.55J/cm2. Results are also presented that illustrate the dependence of the machining quality on the pulse length used. A technique for optimising the focal position at energies below the machining threshold is detailed and we will also present results of a related study investigating the self focusing of femtosecond beams in air.
|Title of host publication||ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings|
|Publication status||Published - 2004|
|Event||ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States|
Duration: 4 Oct 2004 → 7 Oct 2004
|Conference||ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics|
|City||San Francisco, CA|
|Period||4/10/04 → 7/10/04|