Design of a virtual wavelength meter using LabView for quantum cascade laser

摘要

In this paper virtual Wavelength Meter (WM) for Quantum Cascade Laser (QCL) using LabView is presented. Virtual WM has two features, firstly it can provide the emission wavelength of QCL according to change in temperature and current and secondly it provides the necessary parameters values for tuning a QCL at a required wavelength. Virtual WM can make system compact, cost effective, flexible and more user friendly, when used in gas detection system. We present the design, development and implementation of virtual WM using Hamamatsu's QCL, which we tuned from 2189 cm-1 to 2192 cm-1 by changing temperature from 13°C to 25°C and bias current from 720 mA to 820 mA. We were able to detect 7 ppm CO gas using QCL, which was tuned using developed virtual WM.