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High efficiency >26 W diode end-pumped Alexandrite laser.

Achaya Teppitaksak, Ara Minassian, Gabrielle M Thomas

|July 1, 2014

Summary

Researchers achieved high-power, efficient operation of an Alexandrite laser using direct red diode-pumping. This breakthrough demonstrates over 26W continuous-wave output, significantly advancing diode-pumped Alexandrite laser technology.

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Area of Science:

Laser Physics
Solid-State Lasers
Optoelectronics

Background:

Alexandrite lasers are valuable solid-state lasers for various applications.
Previous diode-pumping methods for Alexandrite lasers were limited in output power.
Direct diode-pumping offers a more efficient and compact approach to laser excitation.

Purpose of the Study:

To demonstrate multi-ten Watt operation of an Alexandrite laser using direct red diode-pumping.
To achieve high efficiency in diode-pumped Alexandrite lasers.
To explore the performance capabilities of diode end-pumped Alexandrite rod lasers.

Main Methods:

Utilized direct red diode-pumping for an Alexandrite rod laser.
Investigated continuous-wave (CW) and Q-switched laser operation.

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Employed self-seeding feedback with an external grating for wavelength tuning.

Implemented polarization-switching for Q-switched operation.

Main Results:

Achieved CW output power exceeding 26W, an order of magnitude higher than previous systems.
Attained a slope efficiency of 49%, the highest reported for a diode-pumped Alexandrite laser.
Demonstrated wavelength tuning from 730 to 792nm.
Produced ~mJ pulse energy at 1kHz pulse rate in TEM(00) mode using Q-switching.

Conclusions:

Direct red diode-pumping enables unprecedented multi-ten Watt operation of Alexandrite lasers with high efficiency.
This work significantly advances the capabilities of diode-pumped Alexandrite laser systems.
The demonstrated performance opens new possibilities for high-power Alexandrite laser applications.