achromatic中文

Thorlabs' Mach-Zehnder interferometer clock box subassemblies are designed to be used inside a swept source OCT system with a central wavelength of either 850 nm or 1300 nm. The internal fiber couplers are optimized for flat wavelength responses and coupling losses that have a very low polarization dependence, which make the output signals independent of input polarization changes. The clock box contains two detectors, providing a power monitor signal and a k-clock signal that monitors the output frequency of the swept source. Both outputs have a 200 MHz bandwidth, and the k-clock uses a balanced detection scheme to maximize rejection of common mode noise.

To understand this definition of focal length, we need to define optical center as well. A ...

Relaylens

2019128 — What are the f-numbers on machine vision camera lenses? f-stop explained! · Most lenses are designed to be optimal in the F4-F5. · The higher f- ...

Now, making use of equations \(\ref{eq:2.10.1}\) and \(\ref{eq:2.10.6a,b}\), we obtain the condition that the powers will be the same in red and blue:

It is not the intention of this chapter to study lens aberrations. However, the design of an achromatic doublet lens lends itself to the sort of calculation we are doing in this chapter.

Convexlens

A combination of two lenses in contact, a converging lens made of crown glass and a weaker diverging lens made of flint glass, can be designed so that the combination is a converging lens that is almost achromatic. Flint glass is a little denser than crown glass, and has a higher refractive index and a greater dispersive power.

If we want to make the first lens equibiconvex, so that \(a = b\), and if \(n_1 = 1.5\), Equation \(\ref{eq:2.10.2}\) tells us that \(a\) = 6.86 cm. If \(n_2 = 1.6\), Equation \(\ref{eq:2.10.3}\) then tells us that \(c = −144\) cm. That \(c\) is negative tells us that our assumption that the flint lens was concave to the right was wrong; it is convex to the right.

Close focusing distance ... This indicates the distance to the nearest point that can be focused. Generally, a Fieldscope is used to make distant objects appear ...

Opticallens

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I have indicated the indices and the radii of curvature. The power (reciprocal of the focal length) of the first lens by itself is

Doubletlens

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The schematic of the system is shown in figure 2 below. An internally fiber network is used to tap 5% of the input light to generate Power Monitor and k-clock signals. The remaining light is transmitted to the Output pigtail. Specially designed couplers are used to achieve a flat wavelength response for both the transmitted and the Power Monitor signal. (see figures 3 and 4 below). Both signals of the MZI are detected by an ultra-low noise amplified balanced photo detector.

Since they can not meet on the right side , therefore real image can not be formed. (b). Focal length of the lens (f) = 12 mm. Object distance (u) = 7 mm. Now ...

Asphericallens

Suppose that, instead of making the crown lens equibiconvex, you elect to make the last surface flat – i.e. \(c\) = ∞. What, then, must \(a\) and \(b\) be?

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Telephotolens

Apochromaticlens

An achromatic doublet is typically made of a positive crown glass lens whose power is positive but which decreases with increasing wavelength (i.e. toward the red), cemented to a weaker flint glass lens whose power is negative and also decreases (in magnitude) with increasing wavelength. The sum of the two powers is positive, and varies little with wavelength, going through a shallow minimum. Typically, in designing an achromatic doublet, there will be two requirements to be satisfied: 1. The power or focal length in yellow will be specified, and 2. You would like the power in red to be the same as the power in blue, and to vary little in between.

Although originally designed for OCT systems, this clock can also be used for other synchronization applications.For more details on the clock, please see the Operating Principles Tab.

The other is that the total power in the red is to equal the total power in the blue, and I now make use of equations \(\ref{eq:2.10.5a,b}\) and \(\ref{eq:2.10.7a,b}\):

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Here C, D and F refer to the wavelengths of the C, D and F Fraunhofer lines in the solar spectrum, which are respectively, H\(\alpha\) (656.3 nm), Na I (589.3 nm), H\(\beta\) (486.1 nm), and which may be loosely referred to as “red”, “yellow” and “blue”. A typical value for a crown glass would be about 0.016, and a typical value for a flint glass would be about 0.028.

For example, suppose that we want the focal length in yellow to be 16 cm ( \(P^{(D)}= 0.0625\) cm-1) and that the dispersive powers are 0.016 and 0.028. Equations \(\ref{eq:2.10.8}\) and \(\ref{eq:2.10.11}\) then tell us that we must have \( P_1^{(D)}= 0.14583\) cm-1 \) and \(P_2^{(D)}= -0.083\) cm-1. (\(f_1 =6.86\) cm and \(f_2 = -12.0\) cm).

202281 — I have seen a lot of people use adapters (24 pin female to 10 pin male) but I was hoping if someone would be able to show me a diagram of how ...

This page titled 2.10: Designing an Achromatic Doublet is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Jeremy Tatum via source content that was edited to the style and standards of the LibreTexts platform.

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Rapidly swept laser sources typically use sinusoidal tuning elements to achieve the very fast optical frequency sweep speeds required for OCT imaging applications. Hence, accurate and reliable re-calibration of the OCT signal is required so that the final data points are equidistant in frequency. The Thorlabs swept source laser features a built-in Mach-Zehnder Interferometer (MZI) with balanced detector output that can be used for just this purpose. A frequency clock is derived from the zero crossings of the MZI interference fringe signal; these zero crossings are equally spaced in optical frequency (k-space). While this clock is intended for OCT applications, it can also be used in other synchronization applications.

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