Abstract
Multiple ultrashort laser pulses are widely used in optical spectroscopy, optoelectronic manipulation, optical imaging and optical signal processing etc. The laser pulse multiplication, so far, is solely realized by using the optical setups or devices to modify the output laser pulse from the optical gain medium. The employment of these external techniques is because the gain medium itself is incapable of modifying or multiplying the generated laser pulse. Herein, with single femtosecond laser pulse excitation, we achieve the double-pulsed stimulated emission with pulse duration of around 40 ps and pulse interval of around 70 ps from metal-halide perovskite multiple quantum wells. These unique stimulated emissions originate from one fast vertical and the other slow lateral high-efficiency carrier funneling from low-dimensional to high-dimensional quantum wells. Furthermore, such gain medium surprisingly possesses nearly Auger-free stimulated emission. These insights enable us a fresh approach to multiple the ultrashort laser pulse by gain medium.
Highlights
Multiple ultrashort laser pulses are widely used in optical spectroscopy, optoelectronic manipulation, optical imaging and optical signal processing etc
To characterize the optical gain behavior, the film sample is pumped by a 400-nm laser beam with a stripe spot dimension of 5 mm × 0.2 mm focused by a cylindrical lens to form a waveguide
The photoluminescence (PL) is dominated with a broad spontaneous emission centered at around 800 nm, which originates from the HD perovskite QWs
Summary
Multiple ultrashort laser pulses are widely used in optical spectroscopy, optoelectronic manipulation, optical imaging and optical signal processing etc. The double or multiple laser pulses generation from single ultrashort laser pulse is mainly achieved by using the delay lines and interferometer[11,12,13], multi-order wave plate and polarizer[14], birefringent crystal array[15,16], liquid crystal arrays[17], or integrated passive photonic devices[18], etc All these techniques are using external optical or mechanical methods to modify the output laser pulses from the gain medium, which simulates our interest on whether there is a type of optical gain medium with unique optical properties and carrier dynamics that is capable of generating multiple laser pulses. To our best knowledge, the effects of this carrier funneling process on the optical gain dynamics have rarely been studied in such perovskite MQW system
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