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Ablation Depth

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Yung C Shin – One of the best experts on this subject based on the ideXlab platform.

Jeff A. Squier – One of the best experts on this subject based on the ideXlab platform.

Farrokh Najmabadi – One of the best experts on this subject based on the ideXlab platform.

Ashwini K Sharma – One of the best experts on this subject based on the ideXlab platform.

  • Effect of variation of magnetic field on laser Ablation Depth of copper and aluminum targets in air atmosphere
    Journal of Applied Physics, 2016
    Co-Authors: Khwairakpam Shantakumar Singh, Ashwini K Sharma
    Abstract:

    We report on the effect of transverse magnetic field on laser Ablation of copper and aluminum targets both experimentally and numerically. The Ablation Depth is found to increase with magnetic field from 0 to 0.3 T and decreases at a higher magnetic field (0.5 T). It is demonstrated that the nanosecond laser Ablation is mainly due to melt ejecejection and it solely depends on the thermo-physical parameters of the material. The increase in Ablation Depth with magnetic field is attributed to the increase in heat transfer from the plasma to the target, vapor pressure, and shock pressure. The Ablation due to melt ejecejection is also calculated using vapor pressure through simulation and compared with the experimentally measured Depth. In the presence of magnetic field, we introduce the magnetic pressure in Clausius–Clapeyron vapor pressure equation to account for the combined effect of magnetic field and atmospheric pressure on the vapor pressure of plasma. The ratio of calculated Ablation Depth at 0.3 T with respec…

  • Effect of variation of magnetic field on laser Ablation Depth of copper and aluminum targets in air atmosphere
    Journal of Applied Physics, 2016
    Co-Authors: Khwairakpam Shantakumar Singh, Ashwini K Sharma
    Abstract:

    We report on the effect of transverse magnetic field on laser Ablation of copper and aluminum targets both experimentally and numerically. The Ablation Depth is found to increase with magnetic field from 0 to 0.3 T and decreases at a higher magnetic field (0.5 T). It is demonstrated that the nanosecond laser Ablation is mainly due to melt ejecejection and it solely depends on the thermo-physical parameters of the material. The increase in Ablation Depth with magnetic field is attributed to the increase in heat transfer from the plasma to the target, vapor pressure, and shock pressure. The Ablation due to melt ejecejection is also calculated using vapor pressure through simulation and compared with the experimentally measured Depth. In the presence of magnetic field, we introduce the magnetic pressure in Clausius–Clapeyron vapor pressure equation to account for the combined effect of magnetic field and atmospheric pressure on the vapor pressure of plasma. The ratio of calculated Ablation Depth at 0.3 T with respect to the absence of magnetic field is close to the corresponding experimental Depth ratios indicating that the laser Ablation modeling in the present work is validated. As the magnetic field increases, we observed the scattered mass at the center and around the crater. The size of deposited mass at the center is found to decrease at higher magnetic field which is attributed to breaking of large droplets into smaller ones due to increase in instability at higher magnetic field.

Alice Z. Chuang – One of the best experts on this subject based on the ideXlab platform.

  • Prediction of corneal haze using an Ablation Depth/corneal thickness ratio after laser epithelial keratomileusis
    Journal of Refractive Surgery, 2004
    Co-Authors: Shrabanee Mitra, Alice Z. Chuang
    Abstract:

    PURPOSE: To investigate the usefulness of Ablation Depth/corneal thickness (AD/CT) ratio to predict corneal haze after laser epithelial keratomileusis (LASEK) using a retrospective, comparative, interventional case series. METHODS: Fifty patients (90 eyes; mean age 40.9 years) with myopia, hyperopia, and/or astigmatism underwent bilateral or unilateral LASEK for correction of refractive error. After epithelial flaps were created using an 18% alcohol solution, bilateral or unilateral LASEK was performed using the Alcon Autonomous LADARVision 4000 excimer laser. usual acuity (best spectacle-corrected and uncorrected) and refractive error were measured before and after LASEK. Corneas were assessed by two independent evaluators under a slit-lamp biomicroscope with broad tangential illumination. The relative haze scale was quantitated: 0 (clear), 0.5+ (trace), 1+ (mild), 2+ (moderate), 3+ (marked), and 4+ (severe). RESULTS: Mean preoperative spherical equivalent refraction was -5.46 ± 3.74 D (range -12.375 to +5.00 D), mean Ablation Depth was 93.04 ± 45.03 μm (range 21.2 to 207.2 μm), and mean AD/CT ratio was 0.18 ± 0.09 (range 0.04 to 0.41). Of 90 eyes, 40 eyes had a higher Ablation Depth (AD/CT ratio >0.18) and 50 eyes had a lower Ablation Depth (AD/CT ratio

  • prediction of corneal haze using an Ablation Depth corneal thickness ratio after laser epithelial keratomileusis
    Journal of Refractive Surgery, 2004
    Co-Authors: Shrabanee Mitra, Alice Z. Chuang
    Abstract:

    PURPOSE: To investigate the usefulness of Ablation Depth/corneal thickness (AD/CT) ratio to predict corneal haze after laser epithelial keratomileusis (LASEK) using a retrospective, comparative, interventional case series. METHODS: Fifty patients (90 eyes; mean age 40.9 years) with myopia, hyperopia, and/or astigmatism underwent bilateral or unilateral LASEK for correction of refractive error. After epithelial flaps were created using an 18% alcohol solution, bilateral or unilateral LASEK was performed using the Alcon Autonomous LADARVision 4000 excimer laser. Visual acuity (best spectacle-corrected and uncorrected) and refractive error were measured before and after LASEK. Corneas were assessed by two independent evaluators under a slit-lamp biomicroscope with broad tangential illumination. The relative haze scale was quantitated: 0 (clear), 0.5+ (trace), 1+ (mild), 2+ (moderate), 3+ (marked), and 4+ (severe). RESULTS: Mean preoperative spherical equivalent refraction was -5.46 +/- 3.74 D (range -12.375 to +5.00 D), mean Ablation Depth was 93.04 +/- 45.03 microm (range 21.2 to 207.2 microm), and mean AD/CT ratio was 0.18 +/- 0.09 (range 0.04 to 0.41). Of 90 eyes, 40 eyes had a higher Ablation Depth (AD/CT ratio > 0.18) and 50 eyes had a lower Ablation Depth (AD/CT ratio < 0.18); 92.5% of eyes in the higher ratio group developed clinically significant haze (1+ or greater). In the lower ratio group, 94% of eyes developed no more than 1+ corneal haze, if any. CONCLUSION: The Ablation Depth/corneal thickness ratio is useful for predicting corneal haze after LASEK. An AD/CT ratio of 0.18 or more suggests that patients have a high risk of developing clinically significant haze (1+ or more) after LASEK.

  • Prediction of corneal haze using an Ablation Depth/corneal thickness ratio after laser epithelial keratomileusis.
    Journal of refractive surgery (Thorofare N.J. : 1995), 2004
    Co-Authors: Ning Lin, Shrabanee Mitra, Alice Z. Chuang, Steven B. Yee, Richard W. Yee
    Abstract:

    PURPOSE To investigate the usefulness of Ablation Depth/corneal thickness (AD/CT) ratio to predict corneal haze after laser epithelial keratomileusis (LASEK) using a retrospective, comparative, interventional case series. METHODS Fifty patients (90 eyes; mean age 40.9 years) with myopia, hyperopia, and/or astigmatism underwent bilateral or unilateral LASEK for correction of refractive error. After epithelial flaps were created using an 18% alcohol solution, bilateral or unilateral LASEK was performed using the Alcon Autonomous LADARVision 4000 excimer laser. Visual acuity (best spectacle-corrected and uncorrected) and refractive error were measured before and after LASEK. Corneas were assessed by two independent evaluators under a slit-lamp biomicroscope with broad tangential illumination. The relative haze scale was quantitated: 0 (clear), 0.5+ (trace), 1+ (mild), 2+ (moderate), 3+ (marked), and 4+ (severe). RESULTS Mean preoperative spherical equivalent refraction was -5.46 +/- 3.74 D (range -12.375 to +5.00 D), mean Ablation Depth was 93.04 +/- 45.03 microm (range 21.2 to 207.2 microm), and mean AD/CT ratio was 0.18 +/- 0.09 (range 0.04 to 0.41). Of 90 eyes, 40 eyes had a higher Ablation Depth (AD/CT ratio > 0.18) and 50 eyes had a lower Ablation Depth (AD/CT ratio < 0.18); 92.5% of eyes in the higher ratio group developed clinically significant haze (1+ or greater). In the lower ratio group, 94% of eyes developed no more than 1+ corneal haze, if any. CONCLUSION The Ablation Depth/corneal thickness ratio is useful for predicting corneal haze after LASEK. An AD/CT ratio of 0.18 or more suggests that patients have a high risk of developing clinically significant haze (1+ or more) after LASEK.