宽带可调谐光源瞬时波长测量方法研究

激光波长作为“米”基准的重要实现途径之一,其量值准确性在计量校准、精密测量以及光谱探测等领域具有十分重要的意义。目前基于标准物质吸收谱线的波长基准仅能用于单一波长的计量校准,对于宽带光源波长校准手段有限。本文开展宽带连续调谐激光波长校准技术研究,利用飞秒激光频率梳宽光谱、光频可溯源至原子频率标准、稳定性高的特点,对宽带调谐光源在调谐输出时的连续光波长进行测量,最终实现了1 nm带宽下可调谐激光器调谐输出过程中瞬时值的测量,并利用该结果对可调谐激光器在121 GHz带宽的调频非线性度进行了评价。

Research on instantaneous wavelength measurement method of broadband tunable light source

As one of the important ways to realize the "meter" benchmark, the accuracy of laser wavelength is of great significance in the fields of metrological calibration, precision measurement and spectral detection. However, at present, the wavelength reference based on the absorption spectrum of reference materials can only be used for the metrological calibration of single wavelength, and the calibration methods for the wavelength of broadband light source are limited. This paper mainly researches on broadband continuous tuning laser wavelength calibration technology. Using the characteristics of wide spectrum, optical frequency traceable to atomic frequency standard and high stability of femtosecond laser frequency comb, the continuous optical wavelength of broadband tunable light source during tuning output is measured. Finally, the measurement of instantaneous value of the tunable laser in the tuning output process under the bandwidth of 1 nm is realized. Meanwhile, the frequency modulation nonlinearity of tunable laser in 121 GHz bandwidth is evaluated by using the measurement results.