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Extravascular administration, such as oral or intramuscular routes, is a non-invasive drug delivery method, often preferred for ease and patient compliance. A key factor here is absorption, which dictates how quickly and effectively the drug enters the bloodstream from the administration site. Absorption follows either zero-order or first-order kinetics.
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Spectral-Integrated Thermal Absorption Model for Broadband Laser-Protective Reflectors Under Supercontinuum

Yukang Feng1,2, Yanzhi Wang1,2, Yulin Zhang1,2

  • 1Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 15, 2026
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Summary
This summary is machine-generated.

High-power lasers damage targets, but nanometer multilayer coatings offer protection. A new model shows short-wavelength-prioritized reflectors best manage laser energy absorption and reduce temperature rise for broadband laser protection.

Keywords:
laser coatingssupercontinuum lasertemperature risethin film design

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • High-power multiwavelength lasers cause thermal damage to valuable targets.
  • Nanometer-scale multilayer coatings with high reflectivity are crucial for laser protection.
  • Limited research exists on thermal responses of these coatings under multiwavelength irradiation and their broadband protection capabilities.

Purpose of the Study:

  • To develop a universal laser-energy absorption model for nanometer multilayer coatings.
  • To design and experimentally validate ultrabroadband all-dielectric nanometer multilayer reflectors.
  • To investigate the thermal response and protection mechanisms under supercontinuum laser irradiation.

Main Methods:

  • Proposed a novel universal laser-energy absorption model based on spectral intensity integration.
  • Designed ultrabroadband all-dielectric nanometer multilayer reflectors (average reflectance >99.9% from 450-1200 nm).
  • Experimentally evaluated reflector temperature under supercontinuum laser irradiation and used finite-element method for simulations.

Main Results:

  • The energy absorption model revealed exponential decay behavior characterized by two absorption coefficients.
  • Short-wavelength absorption contributes more significantly to temperature rise than long-wavelength absorption.
  • A short-wavelength-prioritized reflector demonstrated the smallest temperature increase, proving effective for broadband laser protection.

Conclusions:

  • The developed model accurately predicts reflector temperature rise under laser irradiation, validated by experimental data.
  • Short-wavelength-prioritized reflectors are highly effective for broadband laser protection.
  • Findings offer valuable insights for the thermal evaluation and design of laser-protective reflectors.