光敏剂双光子吸收截面的测定及其对双光子聚合的影响。

Determination of two-photon absorption cross sections of photosensitizers and its implications for two-photon polymerization.

作者信息

Haq Bibi Safia, Khan Hidayat Ullah, Alam Khan, Ajmal Muhammad, Attaullah Shehnaz, Zari Islam

出版信息

Appl Opt. 2015 Jan 1;54(1):132-40. doi: 10.1364/AO.54.000132.

DOI:10.1364/AO.54.000132

Abstract

We report two-photon absorption cross sections and two-photon excited fluorescence of the photosensitizer 4,4'-Bis(diethylamino)benzophenon and thioxanthone using a femtosecond laser delivering pulses of wavelength 800 nm and 150 fs duration at rates of 1 kHz. Values for the two-photon absorption cross section are derived by comparing the fluorescence signals excited by wavelengths of 800 and 400 nm using a second-harmonic generator. Fluorophore fluorescence intensities dependence with quadratic illumination laser power showed no significant deviation from the two-photon absorption process. Implications of these cross-section measurements for two-photon polymerization are discussed.

摘要

我们使用一台飞秒激光器报告了光敏剂4,4'-双（二乙氨基）二苯甲酮和噻吨酮的双光子吸收截面及双光子激发荧光。该飞秒激光器能以1千赫兹的频率输出波长为800纳米、脉宽为150飞秒的脉冲。通过使用二次谐波发生器比较800纳米和400纳米波长激发的荧光信号，得出双光子吸收截面的值。荧光团荧光强度与二次照明激光功率的依赖性显示与双光子吸收过程无显著偏差。讨论了这些截面测量结果对双光子聚合的影响。