4 Beam-interference module
An external module for the transformation of uniform laser intensity to periodical pattern
4BIM
Functions
Transformation of the conventional laser beam with Gaussian intensity profile to periodically modulated intensity patterns
A large variety of periodical intensity patterns
Compatibility with most ultra-short lasers
Applications
Hierarchical micro/nano-structuring for super-hydrophobic surface creation
Light-harvesting amplification induced by periodical microstructure
Overview
The main and most prominent application of periodically modulated laser interference intensity profile is functional surface structuring at a high processing rate. The hierarchical micro/nanostructures can be created which has superb functional properties like the self-cleaning effect and absorption enhancement by light trapping.
Technical specifications
Number of interfering laser beams: 2, 3, and 4
Interference period: 1 μm
Orientation control of half-wave phase plates for each interfering beam: 0° - 180°, step 2°
The controlled polarization direction of each interfering beam: 0° - 360°, step 4°
Dimensions (xyz): 60 × 15 × 15 cm³
Operating ambient temperature: 15°C to 30°C
Requirements for an external laser source
Incoming beam radius at level 1/e2: 2 mm - 4 mm
Pulse repetition rate: 0 Hz to 100 MHz
Gaussian beam quality: M2 < 1.3
The damage threshold of optics: 10 J/cm² at 532 nm, 10 ns, 20 Hz
Controls
Manual control of polarization direction. The intensity pattern characteristics are controlled by manually adjusting the polarization vector orientation control of each beam by controlling the orientations of half-wave phase plates. The precision optomechanical components are selected for the finest tuning of the periodically modulated interference intensity distribution.
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