Experimental research on thermal and dynamic effects of K9 optical lenses irradiated by low frequency femtosecond laser

Tang, Enling; Lin, Xiaochu; Han, Yafei

doi:10.1364/josab.36.000391

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…The conversion coefficient of intrinsic energy is 0.1, and the wave impedance of optical glass is 1.14 × 10 6 (g cm −2 s −1 ), combining with the known experimental data, the peak pressure of laser shock wave is P = 1.17 GPa. The calculated results are basically consistent with the average laser pulse pressure ( P p = 1.14 GPa) measured using a polyvinylidene fluoride piezoelectric thin film under the same experimental conditions as in the reference . However, when the pulse repetition rate increases continuously, the laser pulse will break through the plasma shielding limit, the energy loss of the pulse decreases and the peak stress increase slightly.…”

Section: Experimental Results and Analysissupporting

confidence: 83%

“…The calculated results are basically consistent with the average laser pulse pressure (P p = 1.14 GPa) measured using a polyvinylidene fluoride piezoelectric thin film under the same experimental conditions as in the reference. 23 However, when the pulse repetition rate increases continuously, the laser pulse will break through the plasma shielding limit, the energy loss of the pulse decreases and the peak stress increase slightly. Although the stress at the laser focus reaches the GPa level, the stress value is still far less than the modulus of elasticity (E = 79.2 GPa) and shear intensity (32.7 GPa) of K9 optical lens, therefore it is difficult to destroy the glass matrix by a single photomechanical effect.…”

Section: Calculation Of Peak Pressure At the Action Point Of Laser mentioning

confidence: 99%

“…The body damage theory of K9 optical glass by pulsed laser was proposed, and based on it the damage morphology changes caused by the change of laser parameters were evaluated . Based on the previous studies, the damage mechanism and physical process of the pulsed laser to optical glass are not clear, so we focus on the experimental study of the thermal and mechanical effects of irradiation, and carry out the preliminary exploration of the interaction between laser and optical materials . Compared with the previous work, the contribution of thermal effect and mechanical effect to the damage effect of laser irradiated optical lens has been comprehensively evaluated.…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22] Based on the previous studies, the damage mechanism and physical process of the pulsed laser to optical glass are not clear, so we focus on the experimental study of the thermal and mechanical effects of irradiation, and carry out the preliminary exploration of the interaction between laser and optical materials. 23 Compared with the previous work, the contribution of thermal effect and mechanical effect to the damage effect of laser irradiated optical lens has been comprehensively evaluated. In this paper, the interaction process of damage has been analyzed in detail, and the damage mechanism is revealed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental research on thermal‐dynamic damage effect of K9 optical lens irradiated by femtosecond laser

Tang

Lin

Han

et al. 2020

Int J of Appl Glass Sci

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The photothermal effect and photodynamic effect are the main factors causing the damage of materials when laser irradiates on it. Therefore, the damage effect of laser irradiation on optical lens evaluated by thermal and mechanical effects will contribute to the development of laser processing and laser damage. In order to study the damage effect of femtosecond laser irradiating on typical K9 optical lens, real‐time temperature during irradiation was measured by infrared thermal imaging combined with laser loading system, at the same time, high‐speed camera observed the irradiation process. Then, with the help of known parameters, the stress at the moment of laser loading was calculated. Finally, the optical lens target was placed under a scanning electron microscope for observation. The results show that maximum temperature and peak stress in experiments were lower than the damage threshold of optical lenses. With the increase of pulse repetition rate, the thermal damage has a cumulative effect, while the photo‐induced pressure only increases slightly. It leads to the dominance of mechanical damage in low‐frequency pulse irradiation, whereas in high‐frequency pulse irradiation, the opposite rule occurs. For transparent materials, the laser pulse shows a stronger damage effect, the product spatters in the direction opposite to the incident beam, while the plasma discharge damage product spatters in the opposite direction, so the damage occurs on both front and back surfaces of the material at the same time.

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Section: Experimental Results and Analysissupporting

confidence: 83%

Section: Calculation Of Peak Pressure At the Action Point Of Laser mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental research on thermal‐dynamic damage effect of K9 optical lens irradiated by femtosecond laser

Tang

Lin

Han

et al. 2020

Int J of Appl Glass Sci

Self Cite

View full text Add to dashboard Cite

show abstract

STOP model development and analysis of an optical collimation system for a tactical high-energy laser weapon

Lyu

Zhan

2021

Appl. Opt.

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To effectively avoid the bottleneck of optical collimation system distortion in the use of tactical high-energy laser weapons (THELWs), this paper proposes and realizes an optical–multiphysics–finite-element coupling analysis method. Combined with dynamic physical parameters, we construct and verify a structure–thermal–optical-performance (STOP) model and accurately restore the multiphysics coupling phenomenon in the THELW lens. Finally, we conclude that the limiting output power of THELW assembled with the doublet lens is 1155.6 W. Then, we draw a series of conclusions from different physical fields and make a comprehensive analysis of the optical collimation system performance. The analysis methods and conclusions described in the paper are of great significance for the R & D of future laser weapons and other optical systems.

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Experimental research on thermal and dynamic effects of K9 optical lenses irradiated by low frequency femtosecond laser

Cited by 2 publications

References 10 publications

Experimental research on thermal‐dynamic damage effect of K9 optical lens irradiated by femtosecond laser

Experimental research on thermal‐dynamic damage effect of K9 optical lens irradiated by femtosecond laser

STOP model development and analysis of an optical collimation system for a tactical high-energy laser weapon

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