The 568-968 Digimatic Borematic Set ABSOLUTE Snap-Open Bore Gauge enables the operator to take measurements more accurately and more quickly than ever before. Once the origin point is set with the ORIGIN button, the Borematic retains the setting for the entire battery life. Therefore no longer repeated origin setting (presetting) is necessary. The ABSOLUTE linear encoder eliminates the fear of over-speed errors.

Definition: the frequency dependence of the group velocity in a medium, or (quantitatively) the derivative of the inverse group velocity with respect to angular frequency

The calculator is not calculating the chromatic dispersion of silica, but only converting chromatic dispersion values given with different units. The value which you obtain just resulted from the conversion of the original value of −1.88 ps/(nm km) to the other units.

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This quantity is usually specified with units of ps/(nm km) (picoseconds per nanometer wavelength change and kilometer propagation distance). For example, 20 ps/(nm km) at 1550 nm (a typical value for telecom fibers) corresponds to −25 509 fs2/m.

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The group velocity dispersion is the group delay dispersion per unit length. The basic units are s2/m. For example, the group velocity dispersion of silica is +35 fs2/mm at 800 nm and −26 fs2/mm at 1500 nm. Somewhere between these wavelengths (at about 1.3 μm), there is the zero-dispersion wavelength.

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See also: chromatic dispersion, group delay dispersion, group velocity mismatchand other articles in the categories general optics, fiber optics and waveguides, light pulses

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Enter input values with units, where appropriate. After you have modified some values, click a "calc" button to recalculate the field left of it.

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It is important to realize the different signs of GVD and Dλ, resulting from the fact that a long wavelength corresponds to a smaller optical frequency. In order to avoid confusion, the terms normal and anomalous dispersion can be used instead of positive and negative dispersion. Normal dispersion implies that the group velocity decreases for increasing optical frequency; this occurs in most cases.

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T-mount to C-mount lens adapter. This has the standard 1-inch x 32TPI C-mount threads on the inside, and M42x0.75 T-thread on the outside.

I am wondering about the example numbers you are giving here. Specifically the −26 fs2/mm at 1500 nm; by using the calculator, I get 2.25 · 103 fs2/m. Why is there a difference or am I missing something here?

○ A Certificate of Calibration is included when calibration services are ordered from MRM Metrology Inc. ○ Use CAL 568-968 when requesting calibration services from MRM Metrology.

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1" Stage micrometer for measurements using a microscope.

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Group velocity dispersion is the phenomenon that the group velocity of light in a transparent medium depends on the optical frequency or wavelength. The term can also be used as a precisely defined quantity, namely the derivative of the inverse group velocity with respect to the angular frequency (or sometimes the wavelength):

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For optical fibers (e.g. in the context of optical fiber communications), the group velocity dispersion is usually defined as a derivative with respect to wavelength (rather than angular frequency). This can be calculated from the above-mentioned GVD parameter:

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