Frequency characterization of a swept- and fixed-wavelength external-cavity quantum cascade laser by use of a frequency comb.
نویسندگان
چکیده
The instantaneous optical frequency of an external-cavity quantum cascade laser (QCL) is characterized by comparison to a near-infrared frequency comb. Fluctuations in the instantaneous optical frequency are analyzed to determine the frequency-noise power spectral density for the external-cavity QCL both during fixed-wavelength and swept-wavelength operation. The noise performance of a near-infrared external-cavity diode laser is measured for comparison. In addition to providing basic frequency metrology of external-cavity QCLs, this comb-calibrated swept QCL system can be applied to rapid, precise broadband spectroscopy in the mid-infrared spectral region.
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ورودعنوان ژورنال:
- Optics express
دوره 20 11 شماره
صفحات -
تاریخ انتشار 2012