High Power Homogenizing DOE DOE25Q-343-FTS48-6-SP

Overview

The DOE25Q-343-FTS48-6-SP is a high-power homogenizing diffractive optical element (DOE) that reshapes a Gaussian input beam into a uniform square flat-top spot of 48×48 μm. The phase profile is written into UV fused silica by surface-relief processing and is calculated point-to-point from the incident beam, the 100 mm effective focal length and the target output geometry. The element measures 16×16 mm, installed in a Ø25.4×4 mm mechanical housing and operates at 343 nm with a 6 mm incident spot (M2<1.3), giving a 15×15 mm clear aperture, >98 % transmittance and >90 % diffraction efficiency (FWHM).

Applications

• Laser medical and aesthetic systems
• Laser material processing and micromachining
• Laser surface treatment and cleaning
• Flat-top illumination and beam homogenization

Construction & Performance

UV-grade fused silica keeps absorption low and the damage threshold high, so the element tolerates the high average and peak powers typical of industrial and ultraviolet lasers. Because the surface relief is deterministic rather than scattering, the output keeps its square shape with sharp edges, <10 % unevenness (RMS) and an edge roll-off of 3.15 μm. Alignment tolerances are ±0.3 mm (±5% of the input beam diameter) eccentricity and ±5 ° tilt. Key specifications for this model:

• Component size: 16×16 mm, installed in a Ø25.4×4 mm mechanical housing.
• Operating Wavelength: 343 nm
• Output beam spot size: 48×48 μm
• Output beam shape: Square
• Clear Aperture: 15×15 mm
• Effective Focal Length (EFL): 100 mm
• Component Material: UV fused silica
• Incident spot diameter: 6 mm
• Incident beam quality: M2<1.3
• Incident light eccentricity: ±0.3 mm (±5% of the input beam diameter)
• Incident light tilt: ±5 °
• Surface Quality (Scratch/Dig): 60/40
• Transmittance (@working wavelength): >98 %
• Edge Roll-Off (13.5% to 90%): 3.15 μm
• Unevenness (RMS): <10 %
• Diffraction efficiency (FWHM): >90 %

Storage & Handling

Handle the DOE by its housing and keep the diffractive surface free of dust and fingerprints; the surface relief is finer than a polished optical surface, so avoid abrasive wiping. Blow off loose particles before any contact cleaning, then use optical-grade solvent with lens tissue. Observe the orientation of the structured face when mounting, respect the specified incident spot size and beam quality, and store the element in its original container in a clean, dry environment away from direct sunlight.