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Negative dispersion using pairs of prisms.

R L Fork, O E Martinez, J P Gordon

|September 2, 2009

Summary

Pairs of prisms can achieve negative group-velocity dispersion without negative material properties. This novel prism arrangement minimizes losses and maintains beam collinearity, offering adjustable dispersion control.

Area of Science:

Optics and Photonics
Wave Propagation

Background:

Negative material dispersion is typically required for negative group-velocity dispersion.
Existing methods for achieving negative dispersion often involve complex setups or material limitations.

Purpose of the Study:

To demonstrate negative group-velocity dispersion using only prism pairs.
To develop a prism arrangement with minimal optical losses and precise dispersion control.

Main Methods:

Utilizing a specific pair of prisms to induce negative group-velocity dispersion.
Minimizing optical losses through Brewster-surface reflections.
Ensuring the transmitted beam is collinear with the incident beam.

Main Results:

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Achieved negative group-velocity dispersion without relying on negative material properties.

The described prism arrangement limits losses to Brewster-surface reflections.

Demonstrated continuous adjustment of dispersion, including through zero.

Produced a transmitted beam that is collinear with the incident beam, with no transverse displacement.

Conclusions:

Prism pairs offer a viable method for achieving negative group-velocity dispersion.
The developed arrangement provides a practical solution for tunable dispersion with minimal loss and collinear output.