Coarse and fine-tuning of lasing transverse electromagnetic modes in coupled all-inorganic perovskite quantum dots

Inorganic perovskite lasers are of particular interest, with much recent work focusing on Fabry-Perot cavity-forming nanowires. We demonstrate the direct observation of lasing from transverse electromagnetic (TEM) modes with a long coherence time similar to 9.5 ps in coupled CsPbBr(3)quantum dots, which dispense with an external cavity resonator and show how the wavelength of the modes can be controlled via two independent tuning-mechanisms. Controlling the pump power allowed us to fine-tune the TEM mode structure to the emission wavelength, thus providing a degree of control over the properties of the lasing signal. The temperature-tuning provided an additional degree of control over the wavelength of the lasing peak, importantly, maintained a constant full width at half maximum (FWHM) over the entire tuning range without mode-hopping.

Automated summary

This study focuses on the observation and control of transverse electromagnetic (TEM) modes in inorganic perovskite lasers, demonstrating the tuning of emission wavelength through pump power and temperature. The research highlights the ability to maintain a constant full width at half maximum (FWHM) without mode-hopping over the entire tuning range.