Patent ID: 9102008
Filing Date: 2015-08-11
Classification: B23K,B41M,G03F

Abstract:
1. A method of minimizing the deposition of debris onto a sample being ablated, the method comprising: selecting the sample from Cr on SiO mounting the sample on a computer controlled stage; scanning a pulsed laser beam over a region of the sample to be ablated; reducing the laser pulse energy to approximately a threshold level for ablation, wherein a duration of the laser pulse is about 100 fs, and the wavelength of the light beam is about 800 nm; focusing said energy to a spot having a diameter less than a structure to be removed using an immersion object lens having a final element; ablating the region of the sample using a multitude of laser pulses, each pulse being sufficiently separated in time to reduce a concentration of ablation products in a gas phase, the region being ablated having a high aspect ratio structure of depth to width; flowing a liquid selected from the group consisting of water and methanol past the region being ablated to transport the ablation products from the sample, the liquid filling the target area; and matching the index of refraction of said liquid to at least one of the index of refraction of said final element or the index of refraction of said sample.