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Investigation of nonlinear absorption in YAP and YAG single crystals doped with Co and co-doped with Si

Bajor A. L., Kisielewski J., Kopczyński K., Łukasiewicz T., Mierczyk J., Mierczyk Z., Młyńczak J., Pawlak D. A., Świrkowicz M.

Opto-Electronics Review

2009

Vol. 17, No. 2

187-192

Since our attempts to grow YAP:Co,Si non-linear absorbers have failed, we switched to Czochralski grown YAGs doped with the same ions. This time, however, the new material was found to exhibit excellent, non-linear absorption, which can be used directly in Q-switching elements in laser systems. In this work we report on technology of YAG single crystals doped with Co and Si, their optical properties, and, finally, on their non-linear absorption. An explanation on why the YAPs were found to be inefficient in non-linear absorption was also provided.

YAG:V³⁺ : new passive Q-switch for lasers generating radiation within near infrared range

Mierczyk Z., Frukacz Z.

Opto-Electronics Review

2000

Vol. 8, No. 1

67-74

The paper presents results of investigations on growth conditions of yttrium-aluminium garnet doped with trivalent vanadium YAG:V³⁺ ions and investigations of these crystals for their application in passive Q-switches of laser resonators generating radiation within near infrared range. Absorption spectra of the crystals were examined. It was sated that within a spectral range of 720-1500 nm there are three absorption bands with their maxima for the wavelengths of 822 nm, 1098 nm, and 1282 nm. For these maxima the crystal absorption is nonlinearly dependent on intensity of incident radiation, i.e., crystal is a saturable absorber. The process of reduction of V⁵⁺ and V⁴⁺ ions to V³⁺ ones was carried out by means of crystals heating what significantly increases concentration of V³⁺ ions that are responsible for nonlinear absorption. Saturation characteristics have been determined and modulation properties in the systerm of YAG:Nd laser, generating giant-pulses of wavelengths of 1064 nm and 1318 nm have been investigated. Detailed review of the literature and the results of hitherto carried out investigations have been also performed.