使用工作频率为10赫兹的飞秒钛宝石激光系统在钼镜上形成亚波长光栅。

Formation of subwavelength grating on molybdenum mirrors using a femtosecond Ti:sapphire laser system operating at 10 Hz.

作者信息

Sharma Avnish Kumar, Smedley John, Tsang Thomas, Rao Triveni

机构信息

Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973, USA.

出版信息

Rev Sci Instrum. 2011 Mar;82(3):033113. doi: 10.1063/1.3569763.

DOI:10.1063/1.3569763

PMID:21456724

Abstract

We report formation of subwavelength surface grating over large surface area of molybdenum mirror by multiple irradiation of amplified femtosecond laser pulses from a homemade Ti:sapphire oscillator-amplifier laser system in a raster scan configuration. The laser system delivered 2 mJ, 80 fs duration laser pulses at a pulse repetition rate of 10 Hz. Various parameters such as pulse fluence, number of pulses, laser polarization, scan speed, and scan steps were optimized to obtain uniform subwavelength gratings. Energy dispersive x-ray spectroscopy measurements were conducted to analyze the elemental composition of mirror surfaces before and after laser treatment.

摘要

我们报告了通过使用自制的钛宝石振荡器 - 放大器激光系统，以光栅扫描配置多次照射放大的飞秒激光脉冲，在钼镜的大面积表面上形成亚波长表面光栅的情况。该激光系统以10 Hz的脉冲重复频率输出能量为2 mJ、持续时间为80 fs的激光脉冲。对诸如脉冲能量密度、脉冲数量、激光偏振、扫描速度和扫描步长等各种参数进行了优化，以获得均匀的亚波长光栅。进行了能量色散X射线光谱测量，以分析激光处理前后镜面的元素组成。