Photonically integrated spectroscopy platform using grating-to-grating coupling (Conference Presentation)

Doug Bopp; Songbai Kang; Matthew T Hummon; John E. Kitching; Vladimir A. Aksyuk; Kartik A. Srinivasan; Sangsik Kim; Daron A. Westly

doi:10.1117/12.2298114

Translator Disclaimer

14 March 2018 Photonically integrated spectroscopy platform using grating-to-grating coupling (Conference Presentation)

Doug Bopp, Songbai Kang, Matthew T Hummon, John E. Kitching, Vladimir A. Aksyuk, Kartik A. Srinivasan, Sangsik Kim, Daron A. Westly

Author Affiliations +

Proceedings Volume 10548, Steep Dispersion Engineering and Opto-Atomic Precision Metrology XI; 105481J (2018) https://doi.org/10.1117/12.2298114
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

In the pursuit of developing a portable wavelength reference, a photonically integrated chip (PIC) was developed to perform high resolution spectroscopy in a small package. The PIC outcouples light from one grating into free space where it is reflected and directed into an adjacent grating that couples into a separate waveguide. These gratings are extreme-mode-converters which convert the confined mode with a characteristic mode size of less than a micron to a collimated 100 micron diameter beam in order to mitigate transit time broadening for high resolution spectroscopy as well as reduce the diffraction angle. A miniature atomic vapor cell is inserted in the path of the beam to complete the spectroscopic platform. Preliminary results demonstrate sub-Doppler features. Coupling into the chip is achieved using fiber arrays enabling the spectroscopic signal to be routed back through an optical fiber and monitored. A laser is then locked to these sub-Doppler features completing an integrated wavelength reference. Analysis of the atom-light interactions made available by this platform will be discussed with an emphasis on the application of such structures to portable wavelength metrology.

Conference Presentation

Citation Download Citation

Doug Bopp, Songbai Kang, Matthew T Hummon, John E. Kitching, Vladimir A. Aksyuk, Kartik A. Srinivasan, Sangsik Kim, and Daron A. Westly "Photonically integrated spectroscopy platform using grating-to-grating coupling (Conference Presentation)", Proc. SPIE 10548, Steep Dispersion Engineering and Opto-Atomic Precision Metrology XI, 105481J (14 March 2018); https://doi.org/10.1117/12.2298114

ACCESS THE FULL ARTICLE