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Diffractive micro-lens array (DLA) for uniform and selective picosecond laser treatment.

Jongman Choi1, Ta Minh Duc1, Hyejin Kim2

  • 1Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea.

Biomedical Optics Express
|May 19, 2023
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Summary

A novel diffractive micro-lens array (DLA) enables uniform, selective picosecond laser treatments for skin rejuvenation and pigment removal. This optical element achieves deeper, more controlled micro-injuries than traditional diffractive optical elements or micro-lens arrays.

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Area of Science:

  • Dermatology
  • Optical Engineering
  • Biomedical Optics

Background:

  • Picosecond Nd:YAG lasers are used in dermatology for pigmented lesions and skin rejuvenation.
  • Current optical elements like diffractive optical elements (DOE) and micro-lens arrays (MLA) have limitations in achieving uniform and selective laser treatment.

Purpose of the Study:

  • To design and develop a novel diffractive micro-lens array (DLA) combining DOE and MLA features.
  • To evaluate the DLA's efficacy in achieving uniform and selective laser treatment for dermatological applications.

Main Methods:

  • Optical simulation and beam profile measurement were used to characterize the DLA.
  • Histological analysis assessed the micro-injury patterns and depths generated by DLA-assisted laser treatment.
  • Comparison with traditional DOE and MLA treatments.

Main Results:

  • DLA generated a uniform square macro-beam composed of multiple micro-beams.
  • DLA-assisted laser treatment created micro-injuries at various skin depths (up to 1200 µm).
  • DOE resulted in shallow penetration, while MLA produced non-uniform micro-injuries.

Conclusions:

  • The DLA offers uniform and selective laser treatment capabilities.
  • DLA-assisted picosecond Nd:YAG laser irradiation shows potential for effective pigment removal and skin rejuvenation.
  • DLA represents an advancement over DOE and MLA for dermatological laser treatments.