This article is cited in 26 papers

Nonlinear optical phenomena

Visualiser of two-micron laser radiation based on Ho:CaF₂ crystals

A. A. Lyapin^a, P. A. Ryabochkina^a, S. N. Ushakov^b, P. P. Fedorov<sup>b

a</sup> Ogarev Mordovia State University, Saransk
^b A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow

Abstract: The anti-Stokes luminescence spectra of Ho:CaF₂ crystals corresponding to the ⁵G₄ → ⁵I₈, ⁵G₅ → ⁵I₈, ⁵F₃ → ⁵I₈, ⁵F₄(⁵S₂) → ⁵I₈, ⁵F₅ → ⁵I₈, ⁵S₂ → ⁵I₇, ⁵I₄ → ⁵I₈, ⁵I₅ → ⁵I₈, ⁵F₅ → ⁵I₇, ⁵F₃ → ⁵I₆, ⁵I₆ → ⁵I₈, ⁵F₅ → ⁵I₆, and ⁵I₅ → ⁵I₇ transitions upon excitation of the ⁵I₇ level of Ho³⁺ ions are studied. A method for visualisation of IR radiation in the two-micron range using Ho:CaF₂ crystals is proposed. The energy efficiency of conversion of two-micron laser radiation to radiation in the red spectral range 620 – 690 nm by a 1 mol % HoF₃:CaF₂ crystal is estimated to be no higher than 0.02%.

Keywords: Ho:CaF₂ crystals, anti-Stokes luminescence, visualisation of IR radiation.

PACS: 78.60.Lc, 42.79.Nv, 42.70.Mp

Received: 27.02.2014
Revised: 21.03.2014

 English version: Quantum Electronics, 2014, 44:6, 602–605

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