Home Science Scientists demonstrate world’s first continuous-wave lasing of deep-ultraviolet laser diode at room temperature

Scientists demonstrate world’s first continuous-wave lasing of deep-ultraviolet laser diode at room temperature

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For the first time in the world, scientists have demonstrated continuous wave lasing of a deep UV laser diode at room temperature. Credit: Issey Takahashi

A research group led by 2014 Nobel laureate Hiroshi Amano of the Institute for Advanced Materials and Systems, Nagoya University (IMaSS), in collaboration with Asahi Kasei Corporation, has succeeded in the world’s first deep room-temperature continuous-wave laser oscillation. • Ultraviolet laser diodes (wavelengths up to the UV-C region).

These results are applied physics letterrepresents a step towards widespread use of the technology with potential for a wide range of applications. sterilization and medicine.

After decades of research and development since their introduction in the 1960s, laser diodes (LDs) have been successfully commercialized for many applications with wavelengths ranging from infrared to blue-violet. For example, optical communication devices using infrared LDs and Blu-ray discs using blue-violet LDs.

However, despite the efforts of research groups around the world, no one has been able to develop a deep UV LD. Since 2007, an important breakthrough has occurred with the advent of techniques to produce aluminum nitride (AlN) substrates, an ideal material for growing aluminum gallium nitride (AlGaN) films for UV light emitting devices.

Demonstration of room temperature continuous wave lasing. Credit: 2022 Asahi Kasei Corporation and Nagoya University

In 2017, Professor Amano’s research group began developing deep-UV LDs in cooperation with Asahi Kasei, which provided the 2-inch AlN substrate. Initially, it was too difficult to inject sufficient current into the device, which hindered further development of UV-C laser diodes.

However, in 2019, the research group successfully solved this problem using polarization-induced doping technology. They produced the first short-wave ultraviolet-visible (UV-C) LDs operating with short current pulses.However input power The power required for these current pulses was 5.2 W. This was too high for continuous wave lasing. This is because the power quickly heats up the diode and stops lasing.

For the first time in the world, scientists demonstrate continuous wave lasing of a deep UV laser diode at room temperature

The world’s first researcher to succeed in room-temperature continuous oscillation of a deep-ultraviolet laser diode. Credit: 2022 Asahi Kasei Corporation and Nagoya University

But now, researchers at Nagoya University and Asahi Kasei have reshaped the structure of the device itself, reducing the driving power required for the laser to operate at just 1.1W at room temperature. Early devices were found to require high levels of power to operate because crystal defects in the laser stripe prevented effective current paths from functioning. However, in this study, the researchers found that strong crystal strain produced these defects.

By skillfully adjusting the laser stripe sidewalls, we have suppressed defects, achieved efficient current flow to the active region of the laser diode, and reduced operating power.

The Transformative Electronics Facility (C-TEF), Future Electronics Integrated Research Center, Nagoya University’s industry-academia collaboration platform, made possible the development of new UV laser technology. Under C-TEF, researchers from partners such as Asahi Kasei will share access to state-of-the-art facilities on the Nagoya University campus, providing the people and tools needed to build reproducible, high-quality devices. It offers.

Research team representative Hari Ziyi was involved in the launch of the project in his second year at Asahi Kasei. “I wanted to do something new,” he said in an interview. It was said, ‘The age’.”

This work is a milestone in the practical application and development of semiconductor lasers in all wavelength ranges. In the future, UV-C LD may be applied in healthcare, virus detection, particle measurement, gas analysis, and high resolution. laser process.

“The application to sterilization technology could be groundbreaking,” said Zhang. “Unlike current LED sterilization methods, which are not time efficient, lasers can disinfect large areas over long distances in a short amount of time.” can be particularly useful for

Successful results have been reported in two papers. applied physics letter.

For more information:
Hiroshi Amano et al., Pseudomorphic AlGaN UV-C Laser Diode Suppression by Local Stress Control, applied physics letter (2022). DOIs: 10.1063/5.0124512

Hiroshi Amano et al., Key temperature-dependent properties of AlGaN-based UV-C laser diodes and demonstration of room-temperature continuous-wave lasers, applied physics letter (2022). DOIs: 10.1063/5.0124480

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Nagoya University

Quote: Scientists demonstrate world’s first continuous-wave lasing of deep-UV laser diode at room temperature (November 24, 2022) https://phys.org/news/2022-11-scientists-world- Retrieved 24 Nov 2022 from continuous-wave-lasing-deep-ultraviolet.html

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