Abstract
The power scaling of laser devices can contribute to the future of humanity. Giant microphotonics have been advocated as a solution to this issue. Among various technologies in giant microphotonics, process control of microdomains with quantum mechanical calculations is expected to increase the optical power extracted per unit volume in gain media. Design of extensive variables influencing the Gibbs energy of controlled microdomains in materials can realize desired properties. Here we estimate the angular momentum quantum number of rare-earth ions in microdomains. Using this process control, we generate kilowatt-level laser output from orientation-controlled microdomains in a laser gain medium. We also consider the limitations of current samples, and discuss the prospects of power scaling and applications of our technology. This work overturns at least three common viewpoints in current advanced technologies, including material processing based on magnetohydrodynamics, grain-size control of transparent polycrystals in fine ceramics, and the crystallographic symmetry of laser ceramics in photonics.
Highlights
We proposed the concept of giant microphotonics (G-MiP)[1]
While the repetition rate means the speed at which a laser works, the extraction energy density can show the upper limit of the inversion density in laser gain media, and describe the value of the work done by optical devices
We chose FAP as a host material in this work because of its potential as a high-energy laser gain medium with biocompatibility. Because of their large stimulated emission cross section σe and high thermal conductivity, apatite crystals including F− in their crystal structure were originally proposed as laser host materials for the laser driver in the “Mercury Project”[11], which aimed to increase the repetition rate of current laser drivers for inertial confinement fusion by 105 times[12]
Summary
We proposed the concept of giant microphotonics (G-MiP)[1]. G-MiP generates very bright pulsed optical fields (giant pulses) from the microdomains in laser gain media using the extremely high stored energy realized by microchip laser (MCL) technology and the technology of controlled microdomain with quantum mechanical calculations (QC-MD). We synthesize orientation-controlled Yb3+-doped fluoroapatite Ca5(PO4)3F (Yb:FAP) with QC-MDs under a magnetic field B of 1.4 T This synthesis represents the design of the Gibbs energy using QC-MD technology, and it generates kilowatt-level laser output. We chose FAP as a host material in this work because of its potential as a high-energy laser gain medium with biocompatibility Because of their large stimulated emission cross section σe and high thermal conductivity, apatite crystals including F− in their crystal structure were originally proposed as laser host materials for the laser driver in the “Mercury Project”[11], which aimed to increase the repetition rate of current laser drivers for inertial confinement fusion by 105 times[12]. This work is the starting point for the development of radical brain–machine interfaces for biomonitoring and assistance with neurological functions[14]
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