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

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

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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

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KEYWORDS

Spectroscopy

Diffraction gratings

Photonic integrated circuits

Collimation

Diffraction

Free space

Metrology

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