The employment of undergraduates majoring in optics is mainly in enterprises. For undergraduates, entering a military enterprise is well paid and the job is stable. Most of the state-owned optical instrument factories belong to the North Ordnance Corporation, which is the so-called military enterprise. Most of the optical talents they recruited went directly to the institutions affiliated to the former Ordnance Industry Department, such as Changchun Institute of Technology and Beijing Institute of Technology. After all, it belongs to a system, and most of the recruits graduated from such institutions. Nankai brand is not weak. You can try to invest in these enterprises.

The optical lenses of the enterprises you mentioned are all purchased directly from ready-made matching lenses, and there is basically no need for optical talents.

In fact, I suggest that you can also apply to the quality inspection and measurement departments of joint ventures and large state-owned enterprises. You must have studied applied optics and physical optics, as well as error theory and data processing. Most of the measurement and quality inspection used by enterprises are optical instruments, which are also counterparts.

If the research institute is not a subordinate unit of the enterprise, it is of course the establishment of the enterprise. For example, metrology institutes and quality inspection institutes in various provinces and cities have optical instrument rooms (or geometric measurement rooms) and biochemical analysis rooms, which are equivalent to you. Easier and more stable than the enterprise, and the treatment is not bad. The key is that it is difficult for undergraduates in enterprises to engage in scientific research (there are graduate students)! There is little chance for undergraduate to be promoted in large enterprises, the stability of small enterprises is poor, and foreign enterprises need high education. It should be better to have the opportunity to enter public institutions!