Broadband Diffractive Diffuser Discription

Broadband diffractive diffusers, also known as flat-top diffusers, are diffractive optical elements specifically designed for multi-wavelength medical and aesthetic systems. Coligh manufactures and customizes broadband beam homogenizers for medical and aesthetic laser systems. Unlike traditional diffusers optimized for a single wavelength, our broadband diffusers convert non-uniform laser beams into flat-top beams, delivering consistent, uniform beam shaping with extremely low zero-order intensity across a spectral range. A single broadband diffuser can serve multiple laser sources within a system.

 Broadband Diffractive Diffuser Product Features

• We use high-purity UV-grade fused silica, which features an extremely low coefficient of thermal expansion and high thermal conductivity. This ensures that the diffuser does not deform or experience thermal drift under continuous high-energy laser irradiation. Additionally, combined with our specially designed high-damage-threshold anti-reflective coating, it can withstand high-energy laser densities, offering exceptional durability.
• Our broadband beam homogenizer offers broad spectral compatibility and can be designed and customized to operate across a wide wavelength range from ultraviolet to infrared, covering 200–2100 nm, while maintaining stable optical performance throughout the entire range.
• We employ advanced micro-nano fabrication techniques using lithographically defined diffractive microstructures to convert Gaussian beam profiles into a uniform flat-top distribution. The output beam exhibits excellent uniformity and near-zero zero-order intensity, eliminating the central bright spot.
• Leveraging our proprietary anti-reflective coating design, our diffusers achieve an overall transmittance of over 90% within the specified wavelength range and are capable of withstanding high peak power and high repetition rate laser puls

Why Choose Coligh For Your Broadband Diffractive Diffuser Project

• We have a complete, vertically integrated production chain encompassing optical design, micro-nano processing, precision replication, and coating, ensuring stable delivery times and consistent quality control.
• We possess our own photolithography and etching processing platforms, capable of achieving structural precision at the micron or even nanometer level, guaranteeing the uniformity and consistency of the diffuser
• We can fully customize our products according to client requirements; customization options include beam shape, divergence angle, and spot size.
• Our team of oR&D works closely with clients to provide collaborative R&D support. We offer rapid prototyping services, delivering customized samples within just 4–6 weeks, thereby helping you shorten the overall product development cycle and accelerate your time-to-market.

Coligh  Broadband Diffractive Diffuser Custom Capability

 Broadband Beam Homogenizer Application

• Multi-Wavelength Aesthetic Workstations
  Modern high-end aesthetic laser systems frequently integrate multiple laser sources—each targeting specific indications (such as pigmentation, vascular lesions, skin rejuvenation, or resurfacing)—onto a single platform. A broadband diffuser is positioned within the common optical path where the beams from these multiple sources are combined. Regardless of which wavelength is currently in use, the laser beam passes through this single diffuser for shaping and homogenization, producing a consistent “flat-top” beam profile that is then projected onto the treatment area via a handpiece.
• Tunable or Frequency-Doubled Laser Systems
  Some aesthetic laser devices utilize tunable lasers (such as OPO lasers) or generate different wavelengths through frequency doubling (e.g., converting 1064 nm to 532 nm). In these systems, where the operating wavelength changes dynamically, a broadband diffuser is placed at the laser’s output aperture. Because this diffuser employs a micro-refractive structure (rather than relying on diffraction principles), its beam-shaping performance remains virtually unchanged across a broad range of wavelengths. Consequently, regardless of the specific wavelength to which the laser is tuned, the diffuser consistently produces a flat-top spot with identical divergence angles and uniformity.
• Laser Skin Rejuvenation
  Certain novel aesthetic devices employ a combination of multi-colored lasers (e.g., red, yellow, and green light), applied either simultaneously or sequentially, to target distinct chromophores (such as melanin, hemoglobin, and collagen). Given the significant wavelength differences among these various colors (e.g., 532 nm green, 585 nm yellow, and 660 nm red), a broadband diffuser is installed within the optical path following the combination of these multi-colored beams. This diffuser delivers an identical flat-top shaping effect across the entire broad spectrum ranging from visible light to the near-infrared region. As each colored laser passes through this single diffuser—whether sequentially or simultaneously—it produces a uniform, flat-top spot profile.