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Unambiguous chirp characterization using modified-spectrum auto-interferometric correlation and pulse spectrum.

B Yellampalle, R D Averitt, A J Taylor

|June 17, 2009

Summary

Modified-spectrum auto-interferometric correlation (MOSAIC) is a visual diagnostic for ultrashort laser pulses. Chirp ambiguity is resolved when the pulse spectrum is known, enabling complete pulse characterization.

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Area of Science:

Optics and Photonics
Ultrafast Laser Science
Quantum Information

Background:

Conventional second-order interferometric autocorrelation traces are used for ultrashort laser pulse analysis.
Modified-spectrum auto-interferometric correlation (MOSAIC) offers a sensitive and visual chirp diagnostic method.
Chirp ambiguity can arise in pulse characterization if the field amplitude or spectrum is unknown.

Purpose of the Study:

To investigate the limitations and capabilities of MOSAIC for ultrashort laser pulse characterization.
To demonstrate the conditions under which MOSAIC can lead to chirp ambiguity.
To develop and experimentally validate a technique for unique chirp reconstruction using MOSAIC.

Main Methods:

Construction of example pulse shapes with nearly identical MOSAIC traces.
Theoretical analysis of chirp ambiguity in MOSAIC diagnostics.
Development of a novel reconstruction technique combining MOSAIC envelopes and pulse spectrum information.

Main Results:

Demonstration that MOSAIC alone can be ambiguous for chirp diagnosis without spectral information.
Identification of specific pulse shapes yielding similar MOSAIC traces, highlighting ambiguity.
Successful experimental demonstration of complete pulse characterization using the new technique.

Conclusions:

MOSAIC is a qualitative tool for chirped pulses when spectral information is absent.
Knowledge of the pulse spectrum is crucial for unique chirp reconstruction with MOSAIC.
The developed reconstruction technique enables comprehensive ultrashort laser pulse characterization.