  We propose a method to engineer repulsive long-range interactions between
ultracold ground-state molecules using optical fields, thus preventing
short-range collisional losses. It maps the microwave coupling recently used
for collisional shielding onto a two-photon transition, and takes advantage of
optical control techniques. In contrast to one-photon optical shielding [Phys.
Rev. Lett. 125, 153202 (2020)], this scheme avoids heating of the molecular gas
due to photon scattering. The proposed protocol, exemplified for 23Na39K,
should be applicable to a large class of polar diatomic molecules.
