Wide Angle Polymer-on-Glass (POG) 850nm Diffuser for VCSEL Beam Shaping Product Discription

This wide-angle POG is specifically designed for VCSEL (Vertical Cavity Surface Emitting Laser) light sources with a wavelength of 850 nm, delivering a uniform 60°x60° rectangular beam. It utilizes proven polymer-on-glass (POG) micro-nanoimprint technology to directly bond a precisely engineered light-spreading plate to a D263T glass substrate. The POG diffuser fundamentally suppresses the center-two-spot effect and interference fringes commonly found in VCSEL arrays, enabling the diffuser to produce a uniformly distributed light spot with an exceptionally flat energy distribution even at ultra-wide angles.

Wide Angle POG 850nm Diffuser 60X60 deg For VCSEL Key Features

• This diffuser is specifically designed for 850nm VCSEL light sources. It homogenizes the input beam, offers a transmittance of over 85%, minimizes stray light, and is compatible with mainstream VCSEL array chips.
• The spot output intensity exhibits a flat-top distribution, with a full field of view of 60° × 60°. It features sharp edges and ensures no gaps in the illuminated area. The diffuser ensures uniform light distribution across the surface, minimizing and eliminating high-intensity hotspots.
• The diffuser structure is directly formed on the glass surface as a single, adhesive-free unit, offering excellent thermal stability and withstanding harsh industrial environments.
• Standard thickness is 0.35 mm, with Borofloat D263T as the substrate material. We offer circular, square, and custom shapes.

Wide Angle POG 850nm Diffuser 60X60 deg For VCSEL Technical Specifications

Environment Testing Result Of 850nm VCSEL Diffuser Optical Performance and Uniformity Profile

• This POG 850nm 60°×60° diffuser underwent three environmental reliability tests. Each test utilized 10 samples, with the following acceptance criteria: consistent light distribution pattern, a field of view (FOV) variation not exceeding ±3%, and a center brightness variation not exceeding ±3%.
• High-Temperature Storage: +85°C for 602 hours. Following the test, the light distribution pattern, FOV, and brightness all met the specified standards.
• Thermal Shock: Cycling between -40°C and +85°C, with a dwell time of 0.5 hours at each temperature extreme. After the test, no delamination or deformation of the microstructure was observed, and optical consistency met the specified standards.
• High-Temperature and High-Humidity Endurance: +95°C at 95% relative humidity for 504 hours. Following the test, no degradation was observed in the light distribution pattern, FOV, or brightness.

Custom Capability of 850nm 940nm Diffuser  Flat-top laser homogenizer

850nm 940nm Diffuser  Flat-top laser homogenizer Applications

• ToF 3D Depth Sensing

  ToF cameras rely on wide-angle, highly uniform infrared flood illumination to capture accurate depth maps. Direct emission from VCSEL arrays often results in central hotspots and interference fringes, leading to errors in depth data. Designed as a diffuser specifically for ToF 3D sensing, this product utilizes a “Polymer-on-Glass” (POG) engineered diffuser fabricated via micro-optics technology. By incorporating a zero-order suppression design, it completely eliminates central zero-order hotspots, delivering a pristine, flat-top homogenized laser output that serves as an ideal illumination source for ToF systems.

• LiDAR Beam Shaping

  Short-range solid-state LiDAR and Flash LiDAR systems require simultaneous illumination of the entire detection area to acquire synchronized Time-of-Flight (ToF) data. Conventional lens-based beam shaping struggles to simultaneously satisfy the requirements for a wide field of view, high uniformity, and rectangular coverage. Consequently, specialized LiDAR beam-shaping optics are required to transform the divergent light from VCSELs into a rectangular, flat-top spot with uniform energy distribution.
  When placed within the LiDAR’s optical transmission path, this diffuser—functioning as a POG engineered diffuser—acts as a micro-lens array fabricated using Polymer-on-Glass micro-optics technology. It homogenizes the 850nm VCSEL light source into a flat-top profile, generating a 60° × 60° rectangular light field while simultaneously suppressing the zero-order component to prevent excessive energy concentration at the center.

• Automotive In-Cabin Monitoring

  Driver Monitoring Systems (DMS) and Occupant Monitoring Systems (OMS) require wide-angle, highly uniform infrared illumination of the vehicle cabin without any visible red glow. Direct illumination using VCSELs often results in issues such as central overexposure and peripheral underexposure, thereby compromising the accuracy of facial and posture recognition. To address this, specialized diffusers for automotive in-cabin monitoring are essential. By pairing this 850nm VCSEL diffuser with the VCSEL light source of the cabin monitoring auxiliary light, the POG engineered diffuser—fabricated as a monolithic Polymer-on-Glass structure—effectively suppresses the zero-order component to eliminate central hotspots. The diffuser outputs a 60° × 60° rectangular, flat-top homogenized light field, ensuring uniform coverage across both the driver and passenger areas.