  Besides major advantages for telecommunication applications, VCSELs have
attracted interest for their potential for neuro-inspired computing, frequency
comb generation or high-frequency spin oscillations. In the meantime, strain
applied to the laser structure has been shown to have a significant impact on
the laser emission properties such as the polarization dynamics or
birefringence. In this work, we further explore the influence of strain on
VCSELs and how this effect could be used to fine tune the laser wavelength.
Through a comprehensive investigation, we demonstrate consistent wavelength
shift up to 1 nm and report a sensitivity between 0.12 to 0.18 nm /
millistrain. We also record birefringence values up to 292 GHz. Our results
show that controlled strain level could be considered for fine wavelength
tuning and possibly alleviate the selection of VCSEL for precise wavelength
requirements.
