300nm Laser diodes from BeamQ.

Towards continuous-wave UV-B laser diodes 300nm laser diodes

Researchers in Japan claim the lowest threshold current density so far for a UV-B laser diode (LD) emitting at a wavelength of 300nm [Shunya Tanaka et al, Appl. Phys. Lett., vol118, p163504, 2021]. The 13.3kA/cm2 threshold was achieved by a team from Meijo University, Mie University, Asahi-Kasei Corp and Nagoya University, who focused particularly on optimizing the waveguide thickness and cladding structures.

The researchers see sub-10kA/cm2 thresholds as necessary to realizing continuous-wave operation, which would boost the potential for UV laser diode applications in industry, medicine and biotechnology. A further requirement is for operating voltages to be less than 10V. The UV-B wavelength range is 280-315nm.

Recent Progress of Electrically Pumped AlGaN Diode Lasers in the UV-B and -C Bands.