Build an all-photonic Dynamic Spectral Flattener (DSF) to flatten the spectrum of a laser frequency comb to test with The Palomar Radial Velocity Instrument (PARVI) from 1400-1800 nm.
DSF test facility:
DSF device development:
Milestone: Laboratory demonstration and characterization of a 400-nm bandwidth DSF.
Experimental setup for characterizing the broadband all-photonic spectrum shaper. The light source for the tests was either a super-luminescent diode or an LFC. A paddle wheel polarization controller was used to align the polarization of the source with the TE mode of the waveguides. Light was injected via a v-groove array. The fully packaged PIC is shown. The electrodes on the circuit (chromium plated) as well as the AWGs can easily be seen in the photo. The output was routed to an OSA.
Nemanja Jovanovic, Pradip Gatkine, Boqiang Shen, Maodong Gao, Nick Cvetojevic, Katarzyna Ławniczuk, Ronald Broeke, Charles Beichman, Stephanie Leifer, Jeffrey Jewell, Gautam Vasisht, and Dimitri Mawet "An all-photonic, dynamic device for flattening the spectrum of a laser frequency comb for precise calibration of radial velocity measurements", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121885D (29 August 2022); https://doi.org/10.1117/12.2630301