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Proceedings Paper

Active Q-switch Tm:YLF based on electro-optic KLTN
Author(s): Rotem Nahear; Yehuda Vidal; Salman Noach; Aharon J. Agranat
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Paper Abstract

Electro-optic active Q-switching in a Tm:YLF laser operating at 1.88 μm is demonstrated using a potassium lithium tantalate niobate (KLTN) crystal as the electro-optic medium. Upon approaching the ferroelectric phase transition temperature, KLTN manifests an exceptionally strong quadratic electro-optic effect. Operation with low driving voltages of 550V on a 3 mm wide and 2mm long crystal were demonstrated. Pulse energy of 1.4 mJ with 17 ns pulse duration was obtained at 1 kHz repetition rate with 9.5W incident pump power. A special trapezoidal configuration of the KLTN crystal was used in order to suppress the acousto-optic oscillations that are generated due to the strong electrostriction manifested in KLTN close to the phase transition temperature which lead to strong instabilities in the laser performance. New EO Q switching mechanism was implemented, in which the resonator gain rather than the loss was shifted between two levels by exploiting the different gain of the Tm:YLF crystal in the  and  polarizations. This obviated the need for inserting a polarizer in the laser cavity, and allowed the shortening of the laser cavity.

Paper Details

Date Published: 3 March 2020
PDF: 6 pages
Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 112590X (3 March 2020); doi: 10.1117/12.2548025
Show Author Affiliations
Rotem Nahear, Jerusalem College of Technology (Israel)
The Hebrew Univ. of Jerusalem (Israel)
Yehuda Vidal, The Hebrew Univ. of Jerusalem (Israel)
Salman Noach, Jerusalem College of Technology (Israel)
Aharon J. Agranat, The Hebrew Univ. of Jerusalem (Israel)

Published in SPIE Proceedings Vol. 11259:
Solid State Lasers XXIX: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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