Abstract: A laser calibration scheme comprising a tunable laser and a means of generating wavelength fiducial markers such as a gas absorption reference cell. The output wavelengths of the laser can be described by a set of one or more continuous functions of its tuning signals. The tuning signals across continous wavelength regions of the laser are measured and stored in a lookup table in memory. To target a desired wavelength, the laser first stabilizes to a gas absorption line in close proximity to the desired wavelength. A correction factor is generated by comparing the resulting tuning signals to those previously derived and stored on the lookup table. For the desired wavelength, a set of tuning signals is interpolated from the lookup table and the correction factor is applied to achieve a calibrated output.