Leindecker Nick, Marandi Alireza, Byer Robert L, Vodopyanov Konstantin L, Jiang Jie, Hartl Ingmar, Fermann Martin, Schunemann Peter G
E.L. Ginzton Laboratory, Stanford University, Stanford California 94305, USA.
Opt Express. 2012 Mar 26;20(7):7046-53. doi: 10.1364/OE.20.007046.
We report the extension of broadband degenerate OPO operation further into mid-infrared. A femtosecond thulium fiber laser with output centered at 2050 nm synchronously pumps a 500-μm-long crystal of orientation patterned GaAs providing broadband gain centered at 4.1 µm. We observe a pump threshold of 17 mW and output bandwidth extending from 2.6 to 6.1 µm at the -30 dB level. Average output power was 37 mW. Appropriate resonator group dispersion is a key factor for achieving degenerate operation with instantaneously broad bandwidth. The output spectrum is very sensitive to absorption and dispersion introduced by molecular species inside the OPO cavity.
我们报告了宽带简并光学参量振荡器（OPO）操作进一步扩展到中红外波段的情况。一台输出中心波长为2050 nm的飞秒铥光纤激光器同步泵浦一块500μm长的取向图案化砷化镓晶体，该晶体提供中心波长为4.1μm的宽带增益。我们观察到泵浦阈值为17 mW，在-30 dB水平下输出带宽从2.6μm扩展到6.1μm。平均输出功率为37 mW。合适的谐振器群色散是实现具有瞬时宽带宽的简并操作的关键因素。输出光谱对OPO腔内分子种类引入的吸收和色散非常敏感。
