Improved model for the angular dependence of excimer laser ablation rates in polymer materials

Pedder, J. E. A.; Holmes, Andrew S.; Dyer, P. E.

doi:10.1063/1.3254236

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…The increase in the duration of the plasma plume further explains the enhancement of the impulse in figure 3. From groups (f) to (h) in figure 5, the duration of the plasma emission is gradually decreasing due to the plasma shielding effect [14][15][16]. Therefore, the impulse decreases gradually under the corresponding conditions in figure 3.…”

Section: Plasma Plumementioning

confidence: 92%

Impulse and Plasma Plume Generated By Ablating Aluminum Target with Nanosecond Laser in Double-Pulse Configuration

Ye²,

Zhou³

et al. 2023

J. Phys.: Conf. Ser.

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For laser ablation propulsion, the enhancement of the impulse is very challenging to realize without increasing the laser energy. In this paper, the enhancement of the impulse in vacuum is achieved by laser ablation in double-pulse mode. The impulse produced by irradiating the aluminum target for different energy combinations in double-pulse mode was measured with the torsion pendulum. The plasma plume was observed at the same time by fast photography to analyze the cause of the impulse characteristics. The effect of the energy combinations for double-pulse mode on the ablation impulse was investigated at typical interpulse delay time. When the delay time between the pulses is set to 80 ns, the maximum impulse is increased by approximately 11% compared to that of the single-pulse mode at the same total energy, wherein the energy of the first pulse is 125mJ in total energy of 200mJ. Therefore, the enhancement of the impulse can be achieved by choosing the suitable energy combination in the double-pulse configuration. However, when the time delay is 300ns, the difference in energy combinations has little influence on the impulse. The results reported here provide guidance for the application of laser ablation propulsion in space.

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Section: Plasma Plumementioning

confidence: 92%

Impulse and Plasma Plume Generated By Ablating Aluminum Target with Nanosecond Laser in Double-Pulse Configuration

Ye²,

Zhou³

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…As demonstrated by Pedder et al [25] and Jiménez et al [26], the incorporation of models taking into account the angular dependence of laser-ablation rates as well as the effect of plume absorption can be important in efforts to improve the ablation algorithms used in refractive surgery. Differences in corneal power and corneal asphericity encountered when using this model can significantly affect the visual function of patients after LASIK.…”

Section: Discussionmentioning

confidence: 99%

Ablation Resolution in Laser Corneal Refractive Surgery: The Dual Fluence Concept of the AMARIS Platform

Arba-Mosquera

Hollerbach

2010

Advances in Optical Technologies

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is properly cited.Purpose. To evaluate to which extent individual Zernike terms can be corrected. Methods. Ablation time and fidelity was analysed using different fluence levels (range 90-2000 mJ/cm 2 ) and aspheric ablation profiles. With optimal parameters, the extent to which individual Zernike modes can be corrected was evaluated. Results. The range 188-565 mJ/cm 2 resulted as optimum fluence level with an optimum proportion range 50%-90% for high fluence. With optimal parameters, it corresponds to 2.4 s/D at 6 mm OZ, with fidelity variance of 53 μm RMS, and average ablation error of 0.5 μm for each location. Ablation simulation of coma Z[3,±1] showed 98,4% accuracy and 98% fit quality; trefoil Z[3,±3], 99,9% accuracy and 98% fit quality; spherical aberration Z[4,0], 96,6% accuracy and 97% fit quality; secondary astigmatism Z[4,±2], 97,9% accuracy and 98% fit quality. Real ablation on a flat plate of PMMA of coma Z[3,±1] showed 96,7% accuracy and 96% fit quality; trefoil Z[3,±3], 97,1% accuracy and 96% fit quality; spherical aberration Z [4,0], with 93,9% accuracy and 90% fit quality; secondary astigmatism Z [4,±2], with 96,0% accuracy and 96% fit quality. Conclusions. Ablation of aspherical and customised shapes based upon Zernike polynomials up to the the 8th order seems accurate using the dual fluence concept implemented at the AMARIS platform.

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“…As demonstrated by Pedder et al [37], and Jiménez et al [38], the incorporation of models taking into account the angular dependence of laser-ablation rates as well as the effect of plume absorption, can be important in efforts to improve the ablation algorithms used in refractive surgery. The high accuracy of determination of stroma plume absorption coefficients and the incorporation of this information in laser-ablation equations can improve the prediction of postsurgical corneal shape.…”

Section: Discussionmentioning

confidence: 99%

Analytical optimization of the ablation efficiency at normal and non-normal incidence for generic super Gaussian beam profiles

Arba-Mosquera

Verma

2013

Biomed. Opt. Express

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Abstract:We suggest a general method to determine the optimum laser parameters for maximizing the ablation efficiency for different materials (in particular human cornea) at different incidence angles. The model is comprehensive and incorporates laser beam characteristics and ablative spot properties. The model further provides a method to convert energy fluctuations during ablation to equivalent ablation deviations in the cornea. The proposed model can be used for calibration, verification and validation purposes of laser systems used for ablation processes at relatively low cost and would directly improve the quality of results.

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Improved model for the angular dependence of excimer laser ablation rates in polymer materials

Cited by 11 publications

References 16 publications

Impulse and Plasma Plume Generated By Ablating Aluminum Target with Nanosecond Laser in Double-Pulse Configuration

Impulse and Plasma Plume Generated By Ablating Aluminum Target with Nanosecond Laser in Double-Pulse Configuration

Ablation Resolution in Laser Corneal Refractive Surgery: The Dual Fluence Concept of the AMARIS Platform

Analytical optimization of the ablation efficiency at normal and non-normal incidence for generic super Gaussian beam profiles

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