News Article

CST Publishes Findings Of CoolBlue Project


Single wavelength, blue laser diode offers increased power, lower complexity and smaller size

Thomas Slight, Research Engineer at CST Global,
has successfully published his research paper covering next-generation, GaN,
DFB laser diodes in the Applied Physics Express (APEX) letters journal. APEX
reports on new findings in applied physics and is affiliated with the Institute
of Physics (IoP).

Slight's paper, ‘Continuous-wave operation of
(Al,In)GaN distributed-feedback laser diodes with high-order notched gratings',
summarises the findings of the government-funded, “Quantum Cooling using Mode
Controlled Blue Lasers” project, known as CoolBlue.

The paper reports on the continuous-wave,
room-temperature operation of distributed feedback laser diodes (DFB-LD) with
high-order notched gratings. It covers the design, fabrication and
characterisation of the DFB devices, which are based on the (Al,In)GaN material

Slight explains: “The single wavelength, blue
laser diode source, developed in the project, offered increased power, lower
complexity and smaller size over conventional laser sources. The paper shows it
is possible to transform quantum sensors from laboratory instruments into
miniaturised, robust systems, for a far wider range of commercial applications.
In practice, these are associated with ultra-cold, atom-based, quantum sensing
systems, such as atomic clocks.”

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