75mm plate beam splitter 50/50

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:

• Type: Plate Beam Splitter (Non-Polarizing)

• Split Ratio: 50% Reflection / 50% Transmission (at 45° incidence)

• Diameter: 75 mm

• Thickness: 13 mm (enhanced stability, reduced ghosting)

• Substrate: N-BK7 Borosilicate Crown Glass (high homogeneity, low dispersion)

• Coatings:

  • Partial-Reflective Dielectric Coating (one side)

  • Broadband Anti-Reflection (AR) Coating (opposite side – marked with “AR” arrow)

• Wavelength Range: Optimized for Visible to Near-IR (~400–700 nm)

• 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:

• Lab Provenance: Designed for defense/laser applications, ensuring precision and durability.

• Robust Construction: 13mm thickness provides superior thermal and mechanical stability compared to thinner commercial optics.

• Performance-Optimized: Dielectric coatings offer higher damage threshold and better spectral control than metallic coatings.

Applications:

• Laser Systems: Beam splitting for alignment, power monitoring, or dual-path experiments (HeNe, diode, Argon lasers)

• Interferometry: Core component in Michelson or Mach-Zehnder interferometers for precision metrology

• Microscopy & Imaging: Beam combination for overlay imaging, holography, or augmented reality setups

• Spectroscopy: Splitting light for reference/sample channels in Vis/NIR spectrometers

• Education & Prototyping: Ideal for advanced optics courses, DIY telescopes, or optical demonstration benches