OpticalCoherenceTomographyppt

Dispersion is the separation of light into its component wavelengths. When light is passed through an optical medium such as a lens, not only speed but also direction will depend on the wavelength of light. If the light consists of multiple wavelengths, this difference in speed and direction separates the beam into its component parts.

The international glass code is a six-digit number, where the first three digits are the index of refraction at 59.3. nm minus one, then rounded to three digits. This is followed by Abbe’s number, rounded to three digits and with decimal numbers removed. The international glass code of BK7, a Schott borosilicate crown glass, is 517642. That refers to an index of refraction of 1.5168, and an Abbe value of 64.17. Checking the international glass code is a great way to find both the index of refraction and the dispersion level of a particular type of glass.

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Optical dispersion can be harnessed for beam splitting purposes, but more often it’s an unwanted side effect of the nature of light. The splitting by wavelengths causes what is called chromatic aberration, and you may see a halo or fringes of colors at contrast points on images.

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To understand how dispersive properties can produce undesired effects, imagine a simple telescope with just two focusing lenses. Let’s assume that this telescope is perfect in all ways except that the maker did not account for dispersion. Ideally, the telescope should give a clear view of the object, and all refracted rays would meet at the focus. But dispersion can wreack havoc on your otherwise perfect system.

In this article, part five in a series on optical pitfalls and how to avoid them, we’ll look at just how the dispersive properties of matter change how light behaves. We’ll also look at how we can predict how much a given substrate disperses light.  Not all substrates have significant dispersive properties, but many do. This dispersive behavior of any material can be quantified in a simple way by a number we call Abbe’s value.

OCT is a high-resolution cross-sectional imaging technique that is non-invasive and utilizes NIR light to penetrate into the sample.

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As a vertically integrated supplier, we offer supply chain simplification with a single source for (design for manufacture and assembly) DFMA, engineering, test, manufacture, and integration. Even if we don't make all the subcomponents for your system, we are able to integrate 3rd party components. All of our external suppliers have been through a rigorous qualification process with us, and we have confidence in our component suppliers.

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The lower the Abbe number of a substrate, the higher the dispersion.  We can classify glass according to how much it disperses light; crown glass has an Abbe number of 55 or greater, and flint glass has a dispersion number of less than 50.

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When you, the end user, attempt to focus the telescope, you’ll find you’re playing a losing game. When you bring the red part of the spectrum into focus, blue elements of the image might show a halo. Refocus the other way, and now your blue is in focus, but the red now has the halo. We call this chromatic aberration.

Thanks to our established buying power, design for manufacture focus and continuous improvement, we can help customers overcome these challenges. Expertise in component selection and integration into high-quality and effective OCT subsystems that can be manufactured in volume and to the highest standards is key to systems innovation.

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One beautiful example of this can be seen when you pass visible light—- white light— through a prism. Each color band travels along a slightly different path, and the result is a rainbow of colors.

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Often we imagine light as a single ray, always maintaining its own integrity even while manipulated by lenses, mirrors, and other optical devices. It turns out that concept of light useful though it might be in its simplicity isn’t always a very good visual for what is going on. Different wavelengths of light behave differently and propagate at different speeds. The index of refraction itself changes as wavelength changes. That makes a good knowledge of the dispersive properties of optical materials very important if you don’t want to run into unpleasant surprises.

The Abbe Value is a number that tells us how much the index of refraction of a particular substance depends on the wavelength of light. It is calculated with the index of refraction at three different wavelengths: 486.1 nm, the blue hydrogen f line; 589.3 nm, the yellow sodium d line, and 656.3, the red hydrogen c line.

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You may have carefully chosen your optical materials based on refractive index, durability, and a host of other important parameters, but if you ignore dispersive properties you could run into trouble.

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Customers invariably require bespoke OCT system design, which is dedicated to specific applications, and therefore need to carefully choose their components and supplier to maximize system performance while minimizing cost and development time.

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We understand our customers’ need for high performance, as well as flexibility in design. For decades we have developed integrated subsystems, such as the critical fused fiber coupler, which was initially for the long-distance optical communications industry and is now available for OCT too. We have invested in R&D and listened to our customers’ needs, developing key components such as the optical delay line, PDR (polarization diverse receiver), and collimator for OCT interferometers, as well as subsystems and fully bespoke OCT systems.

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OCT system development success is not solely dependent on an OEM choosing the optimal combination of parts but rather a consideration of time to market and development and manufacture costs is paramount. The approach to design can make the difference between an OCT project reaching the market at the right time and price point or getting delayed in costly refinement cycles.

From an initial focus on biomedical procedures such as cardiology, skin cancer investigations to ophthalmology in the 1990s, optical coherence tomography (OCT) is now being seriously considered for applications such as materials analysis in markets ranging from oil and gas, to food processing and automotive paint testing.

We have the ability to look at a customer's schematic and know where the problems lay. We can help you to develop your system to get better image quality/resolution, speed, stability, smoothness, and reliability.

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We understand the challenge. Optical Coherence Tomography (OCT) systems manufacturers need to deliver systems capable of higher resolution imaging, faster and at lower costs than ever before. You need fit-for-purpose components and systems that are to specification, budget, and timeline. To achieve this at scale, whilst reducing costs over the product lifetime, requires efficient and effective system design.

In addition to standard OCT components and subsystems, we have the design, engineering, and manufacturing expertise to produce custom products. We work with our OEM customers, using our expertise to design, develop, test, and manufacture the solutions customers need to ensure their OCT imaging systems offer the highest degree of functionality and ease of use.

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Chromatic aberration is why it’s important to either choose materials with low dispersion or to design a system where dispersion gets ‘canceled out’ by interactions between elements.