The ridge structure on the lithium niobate substrate is fabricated by using a mixture of benzoic acid and adipic acid to have a larger depth-to-width ratio.

• 在铌酸锂基板上所制作的脊形结构，可改用苯甲酸与己二酸的混合酸作为质子交换源，结果有较佳的脊形结构外观比。