Bias-T tuning

The tuning of a QC laser is performed by changing the temperature of the active zone.  Therefore a small sub-threshold DC bias current can be used to control the emission wavelength of pulsed laser via its heating effect. This method of operation is described in more details in Appendix B.2 of the Manual.

Some of the first reported gas detection experiments were performed using the bias-T tuning method; for example the N2O and CH4 detection experiment reported in this 1998 Optics Letter.