According to consulting reports, recently, the Lehigh University team led by Kumar in collaboration with Sandia National Laboratories published a paper in the journal Nature Communications. A simple and effective technology for power is "surface-emitting" (this technology is very different from those using "edge-emitting" structures). Of these two types of lasers, the surface-emitting structure of semiconductor lasers offers unique advantages for the miniaturization, packaging, and testing of commercial production lasers.
This published study describes a new technology that introduces a specific type of periodicity into the optical cavity of a laser, which essentially radiates high-quality beams with high radiation efficiency, thereby making the laser pointer more efficient. powerful. The study called its scheme "hybrid second- and fourth-order Bragg grating" (this is different from the typical second-order Bragg grating of a surface-emitting laser, in the past 30 years A wide variety of such lasers have been widely used). Researchers claim that their hybrid grating scheme is not limited to terahertz lasers, and that this scheme has the potential to improve the performance of a wide range of surface-emitting semiconductor lasers emitting at different wavelengths.
This study discusses the experimental results of a single-chip single-mode terahertz laser pointer. The laser's power output is 170 milliwatts, which is by far the most powerful laser of its kind. Studies have shown that the so-called hybrid grating can make the laser emit a specific wavelength of laser through a simple periodic change of the marking grating in the laser cavity while maintaining the beam quality. Kumar insists that their technology can be continuously improved in the future to achieve power levels of 1 watt and above. As long as this threshold is overcome, it can attract industry attention and gradually realize the potential commercialization of terahertz laser instruments.