title: Precise wavelength calibration in continuous-wave cavity ringdown spectroscopy based on the HITRAN database.
abstract: We describe the wavelength calibration method of a narrowband laser diode in continuous-wave (CW) cavity ringdown spectroscopy (CRDS). The method uses known spectral lines as wavelength markers to calibrate and refine the wavelength-current relation of laser diodes, and their spectral positions are taken directly from the HITRAN 2004 database. We built a compact CW CRDS apparatus with a 1.517 microm (approximately 6594 cm-1) distributed feedback (DFB) laser diode as the light source and a 25 cm long glass ceramic as the cavity in which to demonstrate the method. A wavelength precision of approximately 0.8 x 10(-3) cm-1 was obtained by comparing the HITRAN 2004 database, which was approximately four times more precise than that of the conventional method.
authors.affiliation: Department of Optoelectronic Engineering, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. zhqitan@sina.com
authors.forename: Zhongqi
authors.initials: Z
authors.lastname: Tan
authors.forename: Xingwu
authors.initials: X
authors.lastname: Long
authors.forename: Jie
authors.initials: J
authors.lastname: Yuan
authors.forename: Yun
authors.initials: Y
authors.lastname: Huang
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang