A new criterion for determining optical damage of nonlinear optical crystals, based on the use of an RF oscillator circuit

By | 15.09.2024
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K. V. Zotov, N. V. Tereshchenko, A. Yu. Ostapiv, G. Yu. Ivanov, O. A. Ryabushkin

  • Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudnyi, Moscow oblast, Russia
  • Kotelnikov Institute of Radioengineering and Electronics (Fryazino Branch), Russian Academy of Sciences, 141190, Fryazino, Moscow oblast, Russia
Abstract: A criterion is proposed for determining laser breakdown in nonlinear optical crystals, based on measuring the absorption coefficient of optical radiation. A possibility of using a Pierce oscillator is demonstrated to determine the optical absorption coefficient in real time. The proposed criterion is applied to find the optical damage threshold of a lithium niobate crystal, which is 500 mJ/cm2, taking into account the self-focusing effect.
Keywords: laser damage threshold, lithium niobate crystal, optical absorption.
The work was performed within the framework of state assignment no. FFWZ-2022-0004 “Space-2”.
Received: 15.09.2023
Revised: 05.10.2023
Accepted: 05.10.2023