尼日利亚采购需求：布儒斯特角、浓度梯度晶体、倍频晶体、感应炉晶体、中红外晶体、钕玻璃激光器

I'm interested in understanding the ordering process for your products. Could you provide a detailed overview of what steps I need to follow? This would include everything from initial inquiries to final confirmations and payment methods. Additionally, it would be helpful to know if there are any specific requirements or documentation needed from my side to ensure a smooth transaction. Please share any relevant timelines for processing orders and shipping as well. Looking forward to your response!