Multi‐Watt Long‐Wavelength Infrared Femtosecond Lasers and Resonant Enamel Ablation

Author:

Yang Xuemei1,Zhang Dunxiang1,Wang Weizhe1,Tian Kan2,He Linzhen1,Guo Jinmiao1,Hu Bo1,Pu Tao1,Li Wenlong3,Sun Shiran4,Ding Chunmei4,Wu Han1,Li Wenkai5,Peng Yujie5,Li Jianshu4,Leng Yuxin5,Liang Houkun1ORCID

Affiliation:

1. School of Electronics and Information Engineering Sichuan University Chengdu Sichuan 610064 China

2. Hymson Laser Intelligent Equipment (Chengdu) Co., Ltd. Chengdu 641419 China

3. Chengdu Dien PHOTOELECTRIC Technology Co., Ltd. Chengdu Sichuan 610100 China

4. College of Polymer Science and Engineering Sichuan University Chengdu Sichuan 610065 China

5. State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra‐intense Laser Science Shanghai Institute of Optics and Fine Mechanics (SIOM) Chinese Academy of Sciences (CAS) Shanghai 201800 China

Abstract

AbstractHigh average power broadband tunable long‐wavelength infrared (LWIR) femtosecond lasers operating at fingerprint wavelengths of 7–14 µm hold significant promise across a range of applications, including molecular hyperspectral imaging, strong‐field light‐matter interaction, and resonant tissue ablation. Here, a 6–12 µm broadband tunable parametric amplifier based on LiGaS2 or BaGa4S7, generating an output power of 2.4 W at 7.5 µm, and 1.5 W at 9.5 µm, pumped by a simple and effective thin‐square‐rod Yb:YAG amplifier producing 110 W 274 fs output pulses is presented. As a proof of concept, efficient resonant ablation and microstructure fabrication on enamel are showcased at the hydroxyapatite resonant wavelength of 9.5 µm, with a laser intensity two orders‐of‐magnitude lower than that required by non‐resonant femtosecond lasers, which can foster more precision surgical applications with superior biosafety.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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