Measurements of the linewidth of a continuous-wave distributed feedback quantum cascade laser

作者：Kasyutich Vasili L^*; Martin Philip A

来源：Optics Communications, 2011, 284(24): 5723-5729.

DOI：10.1016/j.optcom.2011.07.076

• Quantum cascade laser
• Laser linewidth
• Two-sample variance

Two-sample (Allan) variance with a modified algorithm was applied to the determination of the experimental linewidth of a thermoelectrically-cooled continuous-wave distributed feedback quantum cascade laser at a wavelength of 4.333 mu m. From successive laser transmittance scans over the CO2 nu(3), (01(1)1 - 01(1)0) P(33) absorption line at 2307.653 cm(-1), two-sample variances were calculated for the laser frequency difference between different points on the sides of the absorption peak. From the minimum two-sample variance of the laser frequency difference between two adjacent points (5 Its between the points) on the same side of the absorption line the experimental laser linewidth was estimated to be less than 36(7) kHz at a laser power of similar to 25 mW, a laser current of 976 mA and a laser temperature of + 19.5 degrees C.

• 出版日期2011-12-1