Abstract: A method for preparing a filling material includes: dissolving FeCl3·6H2O and an imprinted molecule in water to form a reaction solution; adding DMF to the reaction solution and stirring for dissolution; adding BDC to the reaction solution and stirring for dissolution; soaking PC into the reaction solution and stirring; and treating the reaction solution by a hydrothermal method to remove a molecule of an additive decomposition product and prepare the filling material imprinted with a casting structure of the molecule of additive decomposition product. The present invention can effectively and selectively adsorb the additive decomposition products and achieve the effects of effectively removing the additive decomposition products, preventing the decomposition products from being mixed in an electrodeposition film of the copper, realizing the uniform distribution of current on the cathode and the anode, improving the quality and preparing an electrolytic copper foil for high-frequency signal transmission.

Abstract: A birefringent quartz plate is inserted in the laser cavity to generate two orthogonal polarized beams with different frequencies, and with the amount of frequency difference depending upon the angle of orientation of the crystalline axis of the quartz plate with respect to the longitudinal axis of the laser beam in the cavity. Frequency differences between the generated dual frequency beams can be varied from tens of MHz to more than 1000 MHz, with tuning or variation being effected by a mechanism for rotating the quartz plate. This apparatus provides a dual-frequency laser for interferometry, laser Doppler velocimeters and other applications.