Lasing Characteristics of CH₃NH₃PbCl₃ Single‐Crystal Microcavities under Multiphoton Excitation

Abstract Photoluminescence of CH₃NH₃PbCl₃ single crystals under multiphoton excitation is studied. The emission intensity and wavelength, which are related to the phase of the single crystals, are found to be dependent on the operating temperature and pressure. High optical gain (>110 cm⁻¹ @ ≈395 nm) and high absorption coefficient (≈9 × 10⁻¹⁰ cm⁹ GW⁻⁵ @ 2400 nm) can also be obtained from the single crystals. With suitable design of the resonant optical amplification, lasing emission at ≈395 nm is demonstrated from the single‐crystal microcavities under 2400 nm excitation. Hence, it is verified that CH₃NH₃PbCl₃ single crystals can offer new opportunities for novel nonlinear photonics applications.