Kavli Affiliate: Michael Higley, Alipasha Vaziri, Kristina Nielsen
| Authors: Che-Hang Yu, Yiyi Yu, Liam M. Adsit, Jeremy T. Chang, Jad Barchini, Andrew H. Moberly, Hadas Benisty, Jinkyung Kim, Brent K Young, Kathleen Heng, Deano M. Farinella, Austin Leikvoll, Rishaab Pavan, Rachel Vistein, Brandon R. Nanfito, David G. C. Hildebrand, Santiago Otero-Coronel, Alipasha Vaziri, Jeffery L. Goldberg, Anthony J. Ricci, David Fitzpatrick, Jessica A Cardin, Michael Higley, Gordon B. Smith, Prakash Kara, Kristina J. Nielsen, Ikuko T. Smith and Spencer LaVere Smith
Multiphoton microscopy can resolve fluorescent structures and dynamics deep in scattering tissue, but applying this technique in vivo can be limited by short working distance water-immersion objectives. Here we present an ultra long working distance (20 mm) air objective called the Cousa objective. It is optimized for performance across multiphoton imaging wavelengths, offers a > 4 mm^2 field-of-view with submicron lateral resolution, and is compatible with commonly used multiphoton imaging systems. We share the full optical prescription, and report performance including in vivo 2-photon and 3-photon imaging in a range of species and preparations.