  The field of integrated photonics has significantly impacted numerous fields
including communication, sensing, and quantum physics owing to the efficiency,
speed, and compactness of its devices. However, the reliance on off-chip bulk
lasers compromises the compact nature of these systems. While silicon photonics
and III-V platforms have established integrated laser technologies, emerging
demands for ultra-low optical loss, wider bandgaps, and optical nonlinearities
necessitate other platforms. Developing integrated lasers on less mature
platforms is arduous and costly due to limited throughput or unconventional
process requirements. In response, we propose a novel platform-agnostic laser
integration technique utilizing a singular design and process flow, applicable
without modification to a diverse range of platforms. Leveraging a two-step
micro-transfer printing method, we achieve nearly identical laser performance
across platforms with refractive indices between 1.7 and 2.5. Experimental
validation demonstrates strikingly similar laser characteristics between
devices processed on lithium niobate and silicon nitride platforms.
Furthermore, we showcase the integration of a laser with a resonant
electro-optic comb generator on the thin-film lithium niobate platform,
producing over 80 comb lines spanning 12 nm. This versatile technique
transcends platform-specific limitations, facilitating applications like
microwave photonics, handheld spectrometers, and cost-effective Lidar systems,
across multiple platforms.
