| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Mid-IR Laser Generating Ultrasound in a Polyetheretherketone Polymer |
| Ye Zhang, Gao-You Liu, Yi Chen, Chuan-Peng Qian, Ben-Rui Zhao, Bao-Quan Yao**, Tong-Yu Dai, Xiao-Ming Duan |
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001
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Ye Zhang, Gao-You Liu, Yi Chen et al 2019 Chin. Phys. Lett. 36 114201 |
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Abstract We demonstrate laser ultrasonic generation in polyetheretherketone (PEEK). A middle infrared ZnGeP$_{2}$ optical parametric oscillator (ZGP-OPO) pumped by a Q-switched Ho:YAG laser is employed as the ultrasonic excitation source. The ZGP-OPO has a spectral range of 3.2–3.4 μm. At an output wavelength of 3.4 μm, the maximum average output power of ZGP-OPO is 3.05 W with a pulse width of 24.3 ns, corresponding to a peak power of approximately 127.5 kW. The ultrasound is generated by the laser converted from 3.2 to 3.4 μm in the PEEK composite. The maximum ultrasonic signal amplitude in PEEK is 33 mV under the condition of thermoelastic excitation at 3.4 μm. Ablation occurs in the CPRF sample when the energy fluence is over 122.45 mJ/cm$^{2}$. PEEK has a stronger absorption at 3.4 μm and laser-ultrasound generation is influenced by the wavelength of the laser.
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Received: 31 August 2019
Published: 21 October 2019
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