Group Delay Dispersion Calculator


Group delay dispersion (GDD) is a crucial parameter in the field of optics, particularly in the study of ultrafast laser pulses. It measures how the delay of a pulse varies with frequency, which affects the pulse shape and duration. This article will guide you through understanding GDD, how to use a GDD calculator, the formula involved, an example calculation, and some frequently asked questions.

How to Use

Using the group delay dispersion calculator is simple. Input the necessary parameters, such as the change in group delay and the change in frequency. Click the “Calculate” button to obtain the GDD value.


The formula for calculating group delay dispersion is:


  • Δτg​ is the change in group delay,
  • Δω is the change in angular frequency.

Example Solve

Let’s consider an example to understand how to use the formula. Suppose we have a change in group delay of 50 fs and a change in frequency of 0.2 THz. The GDD can be calculated as:

Frequently Asked Questions (FAQs)

What is group delay dispersion?

Group delay dispersion (GDD) is a measure of how the group delay of a pulse changes with frequency, affecting the pulse’s temporal profile.

Why is GDD important in optics?

GDD is important because it influences the shape and duration of ultrafast laser pulses, which are critical in many scientific and industrial applications.

How can I minimize GDD in my optical setup?

Minimizing GDD can be achieved by using dispersion-compensating elements such as chirped mirrors or prisms in your optical setup.


Understanding and calculating group delay dispersion is essential for anyone working with ultrafast optics. Using the GDD calculator provided here simplifies this process, ensuring accurate and quick results.

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