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报道一种新型光纤化宽带可调连续波中红外激光器系统,该激光系统采用准相位匹配(QPM)的差频产生(DFG)技术,非线性晶体为多周期的周期性极化掺镁铌酸锂晶体(PPMgLN),掺镱光纤激光器(YDFL)用作抽运光源,可调激光器经掺铒光纤放大器(EDFA)功率提升后作为信号光源。利用建立的准相位匹配-差频产生系统,获得了连续波中红外差频光输出;实验发现,温度导致相位失谐的半峰全宽(FWHM)为4.5℃;通过优化选择晶体周期,并结合调节信号光波长和控制温度,该准相位匹配-差频产生系统可在3.1~3.6μm内连续调谐。
A new type of broadband tunable continuous wave infrared laser system is reported. The laser system adopts the technique of quasi-phase matching (DFG) and the non-linear crystal is multi-period periodically polarized magnesium doped niobate Lithium crystal (PPMgLN) and Ytterbium doped fiber laser (YDFL) are used as pumping light source. The tunable laser is amplified by EDFA power and used as signal light source. By using the established quasi-phase matching-difference frequency generation system, the continuous-wave infrared difference frequency light output was obtained. The FWHM of the phase mismatch caused by temperature was found to be 4.5 ℃. By optimizing the crystal period and In combination with adjusting the wavelength of the signal light and the control temperature, the quasi-phase-matching-difference generation system can be continuously tuned in the range of 3.1 to 3.6 μm.