Spherically Shaped Optical Beamsplitter for Distortion Reduction

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Solution Overview

Problem

Conventional cubic beamsplitters suffer from distortion when light strikes their faces at oblique angles, causing displacement issues in optical systems due to refractive effects, which are difficult to compensate for without repositioning system components.

Innovation Solution

A spherically shaped optical beamsplitter with a unitary spherically shaped exterior surface and a partially-reflective layer positioned internally, allowing for rotation to maintain light propagation without distortion by ensuring incident light is received and transmitted normally to the surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a conventional cubic beamsplitter is used, then the device structure is simple and easy to manufacture, but light striking at oblique angles causes distortion and displacement

Engineering Contradiction:

Improvebeamsplitter shapeVSAvoidmanufacturing complexity

Core Design Contradiction:

ShapeVSEase of manufacture

Solution Approach 1:

The patent applies spherical curvature to the beamsplitter surface, replacing the conventional flat cubic shape with a spherical or spheroidal form. This curved geometry ensures that light rays incident at different angles maintain normal incidence relationships with the surface, eliminating refraction-induced distortion and displacement while preserving manufacturing feasibility through spherical molding techniques.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Device complexity

If a conventional cubic beamsplitter is used, then the device complexity is low, but repositioning components is required to compensate for distortion

Engineering Contradiction:

Improvebeamsplitter structureVSAvoidsystem alignment

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The spherical geometry inherently eliminates the need for complex alignment procedures by ensuring normal light incidence across all angles, thereby reducing operational complexity without sacrificing structural simplicity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The spherical beamsplitter design is self-aligning, automatically maintaining proper optical path relationships without requiring external adjustment mechanisms or complex positioning systems.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The spherically shaped beamsplitter prevents distortion by ensuring light is propagated without angular displacement, maintaining beam integrity and reducing the need for complex repositioning of system components.

Implementation Method 1

The partially-reflective layer is positioned in the interior. Means is provided for rotating the spherically shaped optical beamsplitter

Methodology Applied

Scientific EffectPartial reflection: Reflection

Implementation Method 2

The transmission through the beamsplitter is refracted according to Fresnel's Equations

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS7701638B2Spherically shaped optical beamsplitter

Publication Date: 2010.04.20 UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY

AI summary

A rotatable optical beamsplitter comprises an optically-transparent material and a partially-reflective layer. The optically-transparent material has a unitary spherical exterior surface. The partially-reflective layer is located at least partially within the optically transparent material. The spherically shaped optical beamsplitter demonstrates reduced optical distortion.