Product Description
75mm Diameter 50/50 Plate Beam Splitter – Non-Polarizing, Dielectric Coated (Research-Grade Surplus)
This is a high-performance, non-polarizing plate beam splitter sourced from defense laboratory surplus. Built on a precision N-BK7 substrate with dielectric partial-reflective and anti-reflection (AR) coatings, it delivers reliable 50/50 splitting with minimal absorption and scatter for demanding visible to near-IR applications.
Key Specifications:
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Type: Plate Beam Splitter (Non-Polarizing)
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Split Ratio: 50% Reflection / 50% Transmission (at 45° incidence)
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Diameter: 75 mm
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Thickness: 13 mm (enhanced stability, reduced ghosting)
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Substrate: N-BK7 Borosilicate Crown Glass (high homogeneity, low dispersion)
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Coatings:
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Partial-Reflective Dielectric Coating (one side)
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Broadband Anti-Reflection (AR) Coating (opposite side – marked with “AR” arrow)
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Wavelength Range: Optimized for Visible to Near-IR (~400–700 nm)
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Incidence Angle: 45° (standard)
Condition:
✅ RESEARCH-GRADE SURPLUS – OPTICAL SURFACE PRISTINE
⚠ MECHANICAL: Minor edge nick outside clear aperture – does not affect performance
📐 ARROW MARKING: Clear “AR” indicator for correct orientation
Why This Beam Splitter Is a Superior Value:
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Lab Provenance: Designed for defense/laser applications, ensuring precision and durability.
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Robust Construction: 13mm thickness provides superior thermal and mechanical stability compared to thinner commercial optics.
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Performance-Optimized: Dielectric coatings offer higher damage threshold and better spectral control than metallic coatings.
Applications:
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Laser Systems: Beam splitting for alignment, power monitoring, or dual-path experiments (HeNe, diode, Argon lasers)
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Interferometry: Core component in Michelson or Mach-Zehnder interferometers for precision metrology
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Microscopy & Imaging: Beam combination for overlay imaging, holography, or augmented reality setups
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Spectroscopy: Splitting light for reference/sample channels in Vis/NIR spectrometers
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Education & Prototyping: Ideal for advanced optics courses, DIY telescopes, or optical demonstration benches



