Single-shot and single-spot measurement of laser ablation threshold for carbon nanotubes

TL;DR

This paper introduces a simple method for measuring laser ablation thresholds on carbon nanotubes using a single laser shot and a cylindrical lens to create an elliptical spot, enabling wide-range damage assessment.

Contribution

It presents a novel single-shot, single-spot measurement technique employing a cylindrical lens for efficient ablation threshold determination on carbon nanotubes.

Findings

Ablation threshold for carbon nanotubes is approximately 50 mJ/cm².

The method allows for wide-range damage assessment in one measurement.

Threshold is significantly lower than that of bulk graphite.

Abstract

A simple and convenient procedure for single-shot, single-spot ablation threshold measurement has been developed. It is based on the employment of cylindrical lens to obtain elliptical Gaussian laser spot. The ablated spot chords which are parallel to the minor axis were measured across the spot major axis which is proportional to the fluence cross-section thus providing wide range dependence of damaged spot size versus fluence in one spot measurement. For both conventional and new-developed procedures the ablation threshold for typical Nd:YAG laser parameters (1064 nm, 10 ns) has been measured as 50 mJ/cm2 which is one order of magnitude lower than that for a bulk graphite.