Polymer Homogenization DOEs DOE25H-1064-7-FTS27

Overview

The DOE25H-1064-7-FTS27 is a polymer homogenization diffractive optical element (DOE) that converts a Gaussian input beam into a uniform square flat-top spot of 75.8×75.8 μm. The diffractive phase pattern is written in liquid crystal polymer on a Liquid Crystal Polymer/N-BK7 Window Plate substrate, so the element stays thin (Ø25.4×3.2 mm) while delivering >90% diffraction efficiency (FWHM). It works at 1064 nm with a 7 mm incident spot (M2<1.3) and a 100 mm effective focal length, over a 15×15 mm clear aperture.

Applications

• Laser material processing and micromachining
• Flat-top illumination and beam homogenization
• Laser marking, drilling and surface texturing
• Machine vision and structured illumination

Construction & Performance

The liquid-crystal-polymer layer is patterned lithographically and protected by the substrate window, which keeps the diffractive structure thin and light compared with a surface-relief element on bulk glass. Spot unevenness is <10% (RMS), transmittance is >98 % and the edge roll-off is 8.5 μm. The part expects a uniform polarization state and tolerates ±0.3 mm (±5% of input beam diameter) of eccentricity and ±5 ° of tilt. Key specifications for this model:

• Component size: Ø25.4×3.2 mm
• Operating Wavelength: 1064 nm
• Incident spot diameter: 7 mm
• Output beam spot size: 75.8×75.8 μm
• Clear Aperture: 15×15 mm
• Output beam shape: Square
• Component Material: Liquid Crystal Polymer/N-BK7 Window Plate
• Surface finish: 60/40
• AR Coating: 700-1100 nm
• Reflectivity: Ravg < 0.5% (0° angle of incidence)
• Transmittance (@working wavelength): >98 %
• Diffraction efficiency (FWHM): >90%
• Unevenness (RMS): <10%
• Incident beam quality: M2<1.3
• Incident light spot polarization state: Uniform polarization state
• Incident light eccentricity (XYdisplacement): ±0.3 mm (±5% of input beam diameter)
• Incident light tilt: ±5 °
• Edge Roll-Off (13.5% to 90%): 8.5 μm
• Effective Focal Length (EFL): 100 mm

Storage & Handling

Handle the DOE by its edges and keep the patterned polymer face clean; it is softer than a bare glass surface, so never wipe it dry or with abrasive tissue. Blow off loose particles first, then use optical-grade solvent with lens tissue only when necessary. Respect the specified incident spot size, beam quality and polarization state, and store the element in its original container in a clean, dry place away from direct sunlight and elevated temperature.