A second-harmonic generation nonlinear frequency converter includes a nonlinear optical crystal. The top panel is disposed laterally between the left panel and the right panel, with the top panel oriented substantially perpendicular to the left and right panels. The fiber substrate is wound about the supports such that the fiber substrate forms at least one flat section extending between adjacent supports. Through the identification of mutants for a particular gene, data may be obtained regarding the function and phenotypic effects of that gene, and thereby, the gene can be employed in the creation of novel biotechnological products. An erase pulse is then applied to erase the negative and positive charges respectively formed on the scan and sustain electrodes. A control circuit provides electronic commutation and current control, based on rotor position signals generated with the aid of a control magnet on the rotor shaft.