Longitudinal and transversal coherence in powder laser emission was studied using two different interferometric techniques. It has been shown that longitudinal coherence length in Nd_0.5La_0.5Al_3(BO_3)_4 powder (ceramics) laser emission corresponds to 0.7 A linewidth. This value is in agreement with the results of direct spectroscopic linewidth measurements published in the literature. The transversal coherence has not been shown to be noticeable when the distance between two points on the emitting surface is equal to ≈85 μm. The possible explanation of the result obtained is discussed.
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