Our latest journal article on stabilizing a dispersive spectrograph using moire fringes from a Michelson interferometer, accepted by J. Astr. Tele. Instr. Sys. June 2026. The technique is called crossfading, since it combines the heterodyned fringing signal with the ordinary nonfringing spectrum.

"Spectrograph stabilization using a single-delay interferometer on the Hale Telescope" by David J. Erskine, Jerry Edelstein, Edward H. Wishnow, Martin M. Sirk, Eric V. Linder, and Dayne E. Fratanduono. Also described in this -->

poster for upcoming SPIE Astronomy conference in Copenhagen, July 2026. Associated proceedings here.

---- New paper on spectrograph stabilization using moire fringes

Our previous paper described how to perform crossfading on two separate delays. The new paper extends this same crossfading technique but uses the nonfringing spectrum in place on one of the two delays, so it combines a single delays fringes with the ordinary spectrum that is also present in the data. "Method for boosting dispersive spectrograph stability 1000× using interferometry with crossfaded pairs of delays" by David J. Erskine.

Another poster, on different topic of measuring PSF of the KPF spectrograph simultaneously all over the detector chip, to be presented at same SPIE Astronomy meeting. Associated proceedings here.