The preliminary data of studying optical gain properties of active media using the open aperture z-scan technique without an additional probe beam are demonstrated. The prospects of evaluating pump induced photodynamic processes parameters in UV solid-state active media on the pumping and lasing wavelengths: excited-state absorption and photoionization cross-sections of active ions, effective absorption and ionization cross-sections of color centers and recombination rates are discussed.
We have discovered that total intracavity losses, being dependent on color centers amount, go down for higher pump
energies for LiCaAlF6: Ce3+. This dependence is explained by the formation by the pump radiation and destruction of
color centers due to laser radiation. The more energy remains in the lasing cavity, the lower the color centers absorption.
Such dependencies were investigated for active medium crystals grown by different methods. Influence of growth
conditions on active media characteristics is discussed.
As a result we have shown for the first time that the crystal LiCaAlF6:Ce3+ internal losses depend on the pump energy.
Method has been worked out to determine the intracavity losses of the laser, which allows evaluation of prospects of its
practical use in the most correct way.
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