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Product Description

Used to Compensate for the Phase Difference of Light Beams Caused by the Non-zero Thickness of Optical Components
UV Fused Silica Substrate, Suitable for the 250 nm-450 nm Wavelength Range
Optimal Incident Angle 45°, Commonly Used in High-precision Optical Interference Applications
Two Specifications Available: Circular (with Wedge Angle) and Rectangular (without Wedge Angle)

The LBTEK 45° beam splitter compensator is an optical window used to compensate for phase differences between beams. It is often paired with beam splitters made of the same substrate material and thickness, ensuring that all beams pass through substrates of identical thickness. This minimizes phase discrepancies between split beams, thereby yielding superior experimental results. Depending on the wavelength range, the substrate materials of these compensators typically feature low refractive index, high uniformity, and low thermal expansion coefficients. Currently, LBTEK offers 45° beam splitter compensators with UV-grade fused silica substrates suitable for the 250 nm–450 nm wavelength range. These are available in two size options: circular (1-inch diameter) and rectangular (25 mm × 36 mm). LBTEK's 45° beam splitter compensators deliver excellent performance, efficiently eliminating phase differences between beams. Additionally, LBTEK provides various customization services, including tailored materials, wavelength compatibility, and dimensions/thickness specifications. For specific customization requirements, please contact LBTEK Technical Support.

Attribute

Optical component materialUV fused silica

Clear Aperture＞90%CA

Anti-reflection coating reflectivityRavg＜1.0%@250 nm-450 nm ,45°AOI

Wavefront Distortion (Clear Aperture)λ/10@632.8 nm

20/10

Edge grinding size0.2 mm-0.4 mm，45°

45° Beam Splitter Compensators, Anti-Reflection Coating, Circular

Capable to Compensate for the Phase Difference Caused by Beams Passing Through Optical Substrates of Varying Thicknesses
Commonly Used in High-precision Interferometric Applications, Paired With Beam Splitters
30 Arcmin Wedge Angle Design on the Rear Surface to Reduce Ghosting

The 45° beam-splitting compensator provided by LBTEK is an optical window that can be used to compensate for the phase difference caused by beams passing through substrates of different thicknesses. Unlike the 0° angle of incidence design of traditional window plates, the optimal angle of incidence for the beam-splitting compensator is designed at 45°, making it generally used in conjunction with beam splitters.

LBTEK 45° Beam Splitter Compensator Mounted in Circular Flat Mount Holder

	Product Model	Operating Wavelength	Diameter	Thickness	Unit Price	Compare	Lead Time
	BCP05-633-SP	633 nm	12.7 mm	3.0 mm	$98.45		Contact
	BCP10-UV	250 nm-450 nm	25.4 mm	5.0 mm	$99.23		6 weeks

45° Beam Splitter Compensators, Anti-reflection Coating, Rectangular

Capable to Compensate for the Phase Difference Caused by Beams Passing Through Optical Substrates of Varying Thicknesses
Commonly Used in High-precision Interferometric Applications, Used in Conjunction with Beam Splitters
Parallel Front and Rear Surfaces, 1.0 mm Thickness, More Suitable for Compact Optical Paths

The 45° beam splitter compensator provided by LBTEK is an optical window that can be used to compensate for the phase difference caused by beams passing through substrates of different thicknesses. Unlike the 0° angle of incidence design of traditional window plates, the optimal angle of incidence for the beam splitter compensator is designed at 45°, making it generally used in conjunction with beam splitters.

LBTEK 45° Beamsplitter Compensator mounted in a fixed holder mount

	Product Model	Operating Wavelength	Size	Thickness	Unit Price	Compare	Lead Time
	BCPR-25×36-UV	250 nm-450 nm	25.0 mm×36.0 mm	1.0 mm	$117.01		6 weeks