Method for producing an optical system having at least two separate optical components and at least one optical connection between the two optical components , comprising the following steps: a) providing a first optical component and a second, separate optical component , the first optical component having a first beam profile and the second optical component having a second beam profile ; b) designing the optical system while specifying an arrangement of the first optical component and the second optical component and the form and target position of a first beam-shaping element and a second beam-shaping element , the first beam-shaping element being fixedly connected to the first optical component and the second beam-shaping element being fixedly connected to the second optical component , with the first beam-shaping element being configured to modify the first beam profile and the second beam-shaping element being configured to modify the second beam profile , in such a way that, after positioning the first optical component and the second optical component , an optical coupling is formed between the first optical component and the second optical component ; c) producing the first beam-shaping element and the second beam-shaping element using a three-dimensional direct-writing lithography method in situ at the target position, whereby a first optical component supplemented by the first beam-shaping element and a second optical component supplemented by the second beam-shaping element are obtained; and d) positioning and fixing the first optical component supplemented by the first beam-shaping element and the second optical component supplemented by the second beam-shaping element on a common base plate , whereby the optical system is obtained. a) providing a first optical component and a second, separate optical component , the first optical component having a first beam profile and the second optical component having a second beam profile ; b) designing the optical system while specifying an arrangement of the first optical component and the second optical component and the form and target position of a first beam-shaping element and a second beam-shaping element , the first beam-shaping element being fixedly connected to the first optical component and the second beam-shaping element being fixedly connected to the second optical component , with the first beam-shaping element being configured to modify the first beam profile and the second beam-shaping element being configured to modify the second beam profile , in such a way that, after positioning the first optical component and the second optical component , an optical coupling is formed between the first optical component and the second optical component ; c) producing the first beam-shaping element and the second beam-shaping element using a three-dimensional direct-writing lithography method in situ at the target position, whereby a first optical component supplemented by the first beam-shaping element and a second optical component supplemented by the second beam-shaping element are obtained; and d) positioning and fixing the first optical component supplemented by the first beam-shaping element and the second optical component supplemented by the second beam-shaping element on a common base plate , whereby the optical system is obtained. <EOS>