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. The LDD driver is equipped to accept a dual input.  This method of operation is described in more details in Appendix B.3 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.