Active Q-switch Tm:YLF based on electro-optic KLTN

Rotem Nahear, Yehuda Vidal, Salman Noach, Aharon J. Agranat

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations


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 ï3 and ï polarizations. This obviated the need for inserting a polarizer in the laser cavity, and allowed the shortening of the laser cavity.

Original languageAmerican English
Title of host publicationSolid State Lasers XXIX
Subtitle of host publicationTechnology and Devices
EditorsW. Andrew Clarkson, Ramesh K. Shori
ISBN (Electronic)9781510632813
StatePublished - 2020
EventSolid State Lasers XXIX: Technology and Devices 2020 - San Francisco, United States
Duration: 4 Feb 20206 Feb 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSolid State Lasers XXIX: Technology and Devices 2020
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© 2020 SPIE.


  • Active Q switch
  • Electro optics
  • SWIR lasers


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