High Power Laser and Particle Beams, Volume. 34, Issue 1, 011009(2022)
Influence of mid-infrared laser pulse width on in-band damage threshold of HgCdTe
To study the influence of pulse width on the damage threshold of HgCdTe material irradiated by mid-infrared in-band laser pulse, a one-dimensional model named self-consistent model is established. Some parameters including number density of carrier, carrier and energy current, temperature of carrier and lattice are calculated in the whole process. Damage thresholds of in-band single pulsed laser, whose wavelength is 2.85 μm and pulse width ranges from 30 ps to 10 ns, are obtained. The results show that, damage threshold rauge of in-band laser is 200-500 mJ/cm2. Among them, the damage threshold of 300 ps to 3 ns laser pulses is about 200 mJ/cm2, which is lower than that of other pulsed lasers. The validity of simulation model is verified by setting up the experimental devices and carrying out relevant experiments. Using a single pulsed laser with wavelength of 2.85 μm and pulse width of 300 ps as the light source, the damage threshold is about 200 mJ/cm2. Under the same conditions, when 10 ns single laser pulse is used, the damage threshold is greater than 474 mJ/cm2. The damage process of the HgCdTe material destroyed by hundred-picosecond pulsed laser combines thermal and optical breakdown effects, and its unique mechanism aggravates the destruction of material.
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Weimin Hu, Xiaojun Wang, Changyong Tian, Jing Yang, Ke Liu, Qinjun Peng. Influence of mid-infrared laser pulse width on in-band damage threshold of HgCdTe[J]. High Power Laser and Particle Beams, 2022, 34(1): 011009
Category: Thermal and Mechanical Effects of Laser
Received: Jul. 26, 2021
Accepted: --
Published Online: Jan. 25, 2022
The Author Email: Wang Xiaojun (wangxj@mail.ipc.ac.cn)