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HomeTechWorld’s First Continuous-Wave Lasing of Deep-Ultraviolet Laser Diode at Room Temperature

World’s First Continuous-Wave Lasing of Deep-Ultraviolet Laser Diode at Room Temperature

World’s First Steady-Wave Lasing of Deep-Ultraviolet Laser Diode at Room Temperature

Researchers efficiently carried out the world’s first room-temperature continuous-wave lasing of a deep-ultraviolet laser diode. Credit score: 2022 Asahi Kasei Corp. and Nagoya College

Scientists have efficiently carried out the world’s first room-temperature continuous-wave lasing of a deep-ultraviolet laser diode (wavelengths right down to UV-C area). These outcomes symbolize a step towards the widespread use of a know-how with the potential for a variety of purposes, together with sterilization and drugs. Printed right now (November 24) within the jorunal Utilized Physics Letters, the examine was carried out by a analysis group led by 2014 Nobel laureate Hiroshi Amano at Nagoya University’s Institute of Materials and Systems for Sustainability (IMaSS) in central Japan, in collaboration with Asahi Kasei Corporation, has 

Since they were introduced in the 1960s, and after decades of research and development, successful commercialization of laser diodes (LDs) was finally achieved for a number of applications with wavelengths ranging from infrared to blue-violet. Examples of this technology include optical communications devices with infrared LDs and blue-ray discs using blue-violet LDs. However, despite the efforts of research groups around the world, no one could develop deep ultraviolet LDs. A key breakthrough only occurred after 2007 with the emergence of technology to fabricate aluminum nitride (AlN) substrates, an ideal material for growing aluminum gallium nitride (AlGaN) film for UV light-emitting devices.

Continuous-Wave Lasing of Deep-Ultraviolet Laser Diode at Room Temperature

In world first, scientists demonstrate continuous-wave lasing of deep-ultraviolet laser diode at room temperature. Credit: Issey Takahashi

Starting in 2017, Professor Amano’s research group, in cooperation with Asahi Kasei, the company that provided 2-inch AlN substrates, began developing a deep-ultraviolet LD. At first, sufficient injection of current into the device was too difficult, preventing further development of UV-C laser diodes. But in 2019, the research group successfully solved this problem using a polarization-induced doping technique. For the first time, they produced a short-wavelength ultraviolet-visible (UV-C) LD that operates with short pulses of current. However, the input power required for these current pulses was 5.2 W. This was too high for continuous-wave lasing because the power would cause the diode to quickly heat up and stop lasing.

But now, researchers from Nagoya University and Asahi Kasei have reshaped the structure of the device itself, reducing the drive power needed for the laser to operate at only 1.1W at room temperature. Earlier devices were found to require high levels of operating power because of the inability of effective current paths due to crystal defects that occur at the laser stripe. But in this study, the researchers found that the strong crystal strain creates these defects. By clever tailoring of the side walls of the laser stripe, they suppressed the defects, achieving efficient current flow to the active region of the laser diode and reducing the operating power.

Nagoya College’s industry-academic cooperation platform, known as the Heart for Built-in Analysis of Future Electronics, Transformative Electronics Services (C-TEFs), made doable the event of the brand new UV laser know-how. Beneath C-TEFs, researchers from companions comparable to Asahi Kasei share entry to state-of-the-art services on the Nagoya College campus, offering them with the folks and instruments wanted to construct reproducible high-quality gadgets. Zhang Ziyi, a consultant of the analysis crew, was in his second 12 months at Asahi Kasei when he grew to become concerned within the challenge’s founding. “I wanted to do something new,” he stated in an interview. “Back then everyone assumed that the deep ultraviolet laser diode was an impossibility, but Professor Amano told me, ‘We have made it to the blue laser, now is the time for ultraviolet’.”

This analysis is a milestone within the sensible utility and improvement of semiconductor lasers in all wavelength ranges. Sooner or later, UV-C LDs might be utilized to healthcare, virus detection, particulate measurement, gasoline evaluation, and high-definition laser processing. “Its application to sterilization technology could be groundbreaking,” Zhang stated. “Unlike the current LED sterilization methods, which are time-inefficient, lasers can disinfect large areas in a short time and over long distances”. This know-how might particularly profit surgeons and nurses who want sterilized working rooms and faucet water.

The profitable outcomes have been reported in two papers within the journal Utilized Physics Letters.

References:

“Key temperature-dependent characteristics of AlGaN-based UV-C laser diode and demonstration of room-temperature continuous-wave lasing” by Ziyi Zhang, Maki Kushimoto, Akira Yoshikawa, Koji Aoto, Chiaki Sasaoka, Leo J. Schowalter and Hiroshi Amano, 24 November 2022, Utilized Physics Letters.
DOI: 10.1063/5.0124480

“Local stress control to suppress dislocation generation for pseudomorphically grown AlGaN UV-C laser diodes” by Maki Kushimoto, Ziyi Zhang, Akira Yoshikawa, Koji Aoto, Yoshio Honda, Chiaki Sasaoka, Leo J. Schowalter and Hiroshi Amano, 24 November 2022, Utilized Physics Letters.
DOI: 10.1063/5.0124512

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