RETRACTED — Studies on the effect of instability of divergence, pointing and amplitude of green and yellow radiation pulses of copper vapour laser in second harmonic and sum frequency conversion

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalplicy).The Publisher hereby confirms that the retraction of this article was in no way due to any wrong-doing by the authors. On the contrary, the authors were the victims of a third party who invalidated the editorial process of this article by faking reviewer reports.