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A grate tune
Researchers in the UK and Germany have developed a tunable quantum-dot based ultrashort pulse master oscillator power amplifier. They have achieved a 118-nm tuning range (1165-1283 nm) from 2nd-order grating diffraction, making the laser useful for non-linear imaging techniques, especially in the biomedical field.
MRI is often not possible for patients who have implanted medical devices such as pacemakers, implantable cardioverter and deep brain stimulators. Now, researchers in Korea have designed a medical implant to reduce the scattered electric fields, helping to make MRI safe for patients with metallic implants.
Why so difficult
The difficult nature of stimulated Brillouin scattering (SBS) in polymer optical fibres (POF) has been clarified by researchers in Japan by the observation of SBS in a silica graded-index multimode optical fibre with the same core diameter and length as those of a POF. They conclude that the difficulty lies in the material problems and not in the physical problems (multimode nature, etc).
A weathering look
Researchers in Italy present an optical approach to assessing road conditions such as the presence of ice and rain. Based on measuring the polarisation contrast in reflection and intensity of the diffused light in the near infrared, the method is applicable for a range of applications including road and air traffic safety.
Drops of gold
Improvement of the absorption of PbS colloidal quantum dot films (CQD) using plasmonic scattering has been studied by researchers in Turkey. They have developed an integrated circuit compatible method of introducing colloidal gold nanoparticles to PbS film during spin deposition. The work aims to produce low cost IC compatible IR detectors with improved responsivity