Abstract
Stimulated Raman scattering (SRS) microscopy is regarded as a sensitive molecular-vibrational imaging
method. Its quantum enhancement (QE) is attracting attention for achieving sub-shot-noise sensitivity,
while previous QE-SRS suffered from low optical power, which limits the sensitivity. We present a QESRS
microscope based on quantum-enhanced balanced detection (QE-BD), which allows us to operate
QE-SRS in high-power regimes (＞30 mW) that are comparable to classical SRS microscopes. We observed
a squeezing level of 3.6 dB without an SRS microscope, and the demonstrated QE-SRS imaging
shows 2.89 dB noise reduction compared with classical balanced detection SRS microscopy. These results
confirm that QE-SRS with QE-BD can work in the high-power regime, paving the way for breaking
the sensitivity of classical SRS microscopes.
