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Cryogenically-cooled Yb:YGAG ceramic mode-locked laser.

J Mužík, M Jelínek, V Jambunathan

|February 3, 2016

Summary

A novel Yb:YGAG ceramic laser, cooled with liquid nitrogen, achieves ultrashort pulses. This laser material offers a broader emission spectrum for enhanced pulse generation compared to Yb:YAG.

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Area of Science:

Laser Physics
Materials Science
Solid-State Lasers

Background:

Yb:YGAG (Ytterbium-doped Yttrium Gallium Aluminum Garnet) ceramics offer potential for ultrashort pulse generation due to their broad emission spectrum.
Cryogenic cooling enhances laser performance by narrowing spectral linewidths, but can limit bandwidth.
Comparing Yb:YGAG to Yb:YAG (Yttrium Aluminum Garnet) at low temperatures is crucial for understanding their suitability for advanced laser applications.

Purpose of the Study:

To investigate the performance of a liquid-nitrogen-cooled, SESAM mode-locked Yb:YGAG ceramic laser.
To evaluate the ultrashort pulse generation capabilities of Yb:YGAG at low temperatures.
To explore the continuous-wave operation and wavelength tunability of Yb:YGAG ceramics at 80 K.

Main Methods:

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Fabrication and characterization of a SESAM mode-locked Yb:YGAG ceramic laser.
Operation at liquid nitrogen temperature (77 K).
Measurement of pulse duration, repetition rate, and wavelength.

Main Results:

A stable pulse train with a 119-MHz repetition rate at 1026 nm was achieved.
Ultrashort pulses with a duration of 2.4 ps were measured, significantly shorter than those from cryogenically-cooled Yb:YAG.
Laser performance in continuous-wave operation and wavelength tunability at 80 K was investigated.

Conclusions:

Yb:YGAG ceramic lasers are highly suitable for ultrashort pulse generation, outperforming Yb:YAG at low temperatures.
The broad emission spectrum of Yb:YGAG at low temperatures is key to achieving shorter pulse durations.
Further investigation into continuous-wave and tunable operation of Yb:YGAG ceramics at cryogenic temperatures is warranted.