J. Eur. Opt. Society-Rapid Publ. 22, 55( 2026) 541
4 Conclusion
This paper presents a mid-infrared OPO based on a shared cavity structure and a c-mount packaged LD pump source. This efficient design achieves good spatial mode self-consistency and cavity power enhancement of the fundamental and signal lights through a shared cavity, significantly improving the conversion efficiency. Meanwhile, the adoption of a shared cavity structure greatly reduces the complexity and cost of the OPO system, enabling a compact, economical and reliable integrated device. Using a lowpower LD and a simple shared cavity structure, mid-infrared laser output can be achieved. Such a configuration not only maintains system miniaturization and operational simplicity but also expands the potential for applications in spectroscopy, sensing, and infrared imaging where tailored mid-infrared laser radiation is highly desirable.
The continuous-wave operation mode has limitations in peak power and transient detection capability. Therefore, future work will focus on the research of pulsed shared-cavity OPOs by adopting Q-switched or mode-locked structures, it is expected to obtain high peak power and narrow pulse width mid-infrared output while maintaining the high efficiency and stability of the shared-cavity structure. This direction is expected to further expand the application of the system in fields such as lidar, nonlinear spectroscopic imaging, and ultrafast detection. At the same time, exploring pulsed shared-cavity OPOs based on other nonlinear crystals( such as PPLT, PPKTA, ZGP, etc.) will also be an important way to achieve wider coverage of the mid-infrared band.
Funding
This paper was supported by the Natural Science Foundation of Xiamen City( 3502Z202673045).
Conflicts of interest The authors declare that there are no conflicts of interest.
Data availability statement
Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.
Author contribution statement
Conceptualization, Yi-Ping Wang and Hong-Yi Lin; methodology, Yi-Ping Wang; validation, Shi-Chuang Jiang and Hong-Yi Lin; formal analysis, Yi-Ping Wang, Hong Liu and Hong-Yi Lin; investigation, Shi-Chuang Jiang, Dong Sun and Hong Liu; resources, Yi-Ping Wang, Liang-Qin Gang and Hong-Yi Lin; writing – original draft preparation, Yi-Ping Wang and Hong-Yi Lin; writing – review and editing, Dong Sun and Hong Liu; visualization, Liang- Qin Gan and Hong-Yi Lin; supervision, Dong Sun, Liang-Qin Gan and Hong-Kai Nian; project administration, Yi-Ping Wang and Hong-Kai Nian; funding acquisition, Yi-Ping Wang, Hong-Kai
Nian and Hong-Yi Lin. All authors have read and agreed to the published version of the manuscript.
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