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The level linearity of an optical spectrum analyzer (OSA) refers to the ability of the device to provide accurate and consistent measurements of the optical power across different input signal levels. In other words, it assesses how well the OSA maintains a linear response in terms of power measurements over a range of input signal strengths and is measured in Decibels (dB).
Ideally, an OSA should exhibit excellent level linearity, i.e., when the input power increases or decreases, the OSA's measurements should follow a linear trend, and the output power displayed by the instrument should be proportional to the input power.
A team of researchers led by Dr. Jan Jeske at Fraunhofer Institute for Applied Solid State Physics (IAF) has developed a new sensor system using Laser Threshold Magnetometry (LTM). This system combines nitrogen-vacancy (NV) diamond and a laser diode in an optical resonator, marking a major breakthrough in magnetic field measurement for medical applications. This innovative system allows for the precise detection of extremely small magnetic fields, such as those generated by brain waves, opening up novel possibilities for medical diagnostics and treatment. The research, recently published in Science Advances, marks the first successful demonstration of a dual-media laser system, representing significant progress within the BMBF-funded NeuroQ project... read more
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