stepwise synthesis meaning in Chinese

分步合成
逐步合成

This thesis reviewed the development of tunable lasers , analyse the character and preparation of laser - dye , and introduce the theory of turnable lasers . base on analysis and research , using the solid dye samples made by a stepwise synthesis technique through a sol - gel process , some experiments were done
本论文首先对可调谐激光器的发展、研究进展及应用进行了简单回顾，然后对固态激光染料的特性、制备进行了分析和讨论，进而对可调谐染料激光器的调谐原理进行了理论上的分析和讨论。