What is it about?

A magnetic responsive random laser was developed by roughening the surface of a NiFe alloy thin film-coated GaN substrate using an intense laser. By dispersing the magnetic materials and fabricating a surface roughness on the GaN surface after irradiation with intense laser pulses, we confirmed that the threshold of the random laser can be changed by applying an external magnetic field on the substrate.

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Why is it important?

This method provides a simple method of the fabrication of random lasers directly on a semiconductor substrate, which lasing properties can be modulated by the external stimuli (magnetic field).


Because spin manipulation by light, such as photoinduced magnetization reversal, photoinduced magnetic phase transition, and optically pumped spin polarization, has attracted considerable attention in the field of spintronics, the intra-cavity enhancement of the magneto-optical effect is expected to provide important insights not only for the control of photonic devices by external stimuli but also in the field of spintronics.

Hideki Fujiwara
Hokkai-Gakuen University

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This page is a summary of: Development of magnetic responsive random lasers fabricated by a laser-induced surface roughness, Applied Physics Letters, July 2021, American Institute of Physics, DOI: 10.1063/5.0058284.
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