  Intracellular lasers are emerging as powerful biosensors for multiplexed
tracking and precision sensing of cells and their microenvironment. This
sensing capacity is enabled by quantifying their narrow-linewidth emission
spectra, which is presently challenging to do at high speeds. In this work, we
demonstrate rapid snapshot hyperspectral imaging of intracellular lasers. Using
integral field mapping with a microlens array and a diffraction grating, we
obtain images of the spatial and spectral intensity distribution from a single
camera acquisition. We demonstrate widefield hyperspectral imaging over a
3$\times$3 mm$^2$ field of view and volumetric imaging over
250$\times$250$\times$800 $\mu$m$^3$ volumes with a spatial resolution of 5
$\mu$m and a spectral resolution of less than 0.8 nm. We evaluate the
performance and outline the challenges and strengths of snapshot methods in the
context of characterising the emission from intracellular lasers. This method
offers new opportunities for a diverse range of applications, including
high-throughput and long-term biosensing with intracellular lasers.
