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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Ultrafast diode-pumped Ti:sapphire laser with broad tunability.

Jamie C E Coyle, Alan J Kemp, John-Mark Hopkins

|April 4, 2018

Summary

This study presents a versatile femtosecond Ti:sapphire laser, tunable across a wide wavelength range. It achieves high output power and short pulses using semiconductor saturable absorber mirror (SESAM) and Kerr-lens mode-locking (KLM) methods.

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Area of Science:

Laser physics
Ultrafast optics
Materials science

Background:

Ti:sapphire lasers are crucial for generating ultrashort pulses.
Mode-locking techniques are essential for achieving femtosecond pulse durations.
Combining different mode-locking methods can enhance laser performance.

Purpose of the Study:

To develop a broadly tunable femtosecond diode-pumped Ti:sapphire laser.
To investigate the performance of semiconductor saturable absorber mirror (SESAM) and Kerr-lens mode-locking (KLM) techniques in this laser system.
To achieve high output power and short pulse durations across a wide wavelength range.

Main Methods:

Passive mode-locking using both SESAM and KLM techniques.
Diode-pumping the Ti:sapphire gain medium with 450 nm laser diodes.
Characterization of output power, pulse duration, and wavelength tunability.

Main Results:

SESAM mode-locking yielded up to 433 mW average output power with 62 fs pulses and 37 nm tunability (788-825 nm).
KLM mode-locking achieved up to 382 mW average output power with 54 fs pulses and 120 nm tunability (755-875 nm).
Broad wavelength tunability was demonstrated in both mode-locking regimes.

Conclusions:

The developed Ti:sapphire laser offers broad wavelength tunability and high performance.
Both SESAM and KLM techniques are effective for femtosecond pulse generation in this laser system.
This laser system is suitable for various applications requiring tunable ultrashort pulses.