Yokogawa introduces AQ6377, a new wide-band optical spectrum analyser (OSA) for environmental sensing and medical applications.
In environmental sensing applications, lasers are used to detect gases such as CO2, N2O and NO, achieved by identifying their wavelength absorption lines. However, the side modes of the laser, which are normally hard to detect, reduce the laser’s capability to distinguish between the various gases.
In the 3.5-5µm range (mid-infrared), Yokogawa’s AQ6377 is the only OSA capable of analysing the wavelength spectrum of lasers, including their side modes, with high accuracy.
Quantum Cascade Lasers (QCL), which are increasingly being used for medical spectroscopy diagnostics, operate using a pulsed technique, across a very wide wavelength range. The Yokogawa AQ6377 performs stable measurements in this wide wavelength range and evaluates pulsed QCL signals with low repetition rates, which has hitherto been difficult to achieve.
Key features of the AQ6377, which together provide the capability to visualise the side-modes of MWIR lasers, include a wavelength resolution of 0.2nm, a wavelength accuracy of ±0.5nm, a high dynamic range of 50dB, and a level sensitivity down to -60dBm.