Gold nanorods as saturable absorbers for the passively Q-switched Nd∶LLF laser at 1.34 μm

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 57-61
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201917.041401

摘要

Gold nanorods (GNRs) with two different aspect ratios were successfully utilized as saturable absorbers (SAs) in a passively Q-switched neodymium-doped lutetium lithium fluoride (Nd∶LLF) laser emitting at 1.34 μm.Based on the GNRs with an aspect ratio of five,a maximum output power of 1.432 W was achieved,and the narrowest pulse width was 328 ns with a repetition rate of 200 kHz.But,in the case of the GNRs with the aspect ratio of eight,a maximum output power of 1.247 W was achieved,and the narrowest pulse width was 271 ns with a repetition rate of 218 kHz.Our experimental results reveal that the aspect ratios of GNRs have different saturable absorption effects at a specific wavelength.In other words,for passively Q-switched lasers at a given wavelength,we are able to select the most suitable GNRs as an SA by changing their aspect ratio.