Schriber Cinia, Emaury Florian, Diebold Andreas, Link Sandro, Golling Matthias, Beil Kolja, Kränkel Christian, Saraceno Clara J, Südmeyer Thomas, Keller Ursula
Opt Express. 2014 Aug 11;22(16):18979-86. doi: 10.1364/OE.22.018979.
We present for the first time a SESAM-modelocked thin-disk laser (TDL) that incorporates two gain materials with different emission spectra in a single TDL resonator. The two gain media used in this experiment are the sesquioxide materials Yb:Lu2O3 and Yb:Sc2O3, which have their spectral emission peak displaced by ≈7 nm. We can benefit from a combined gain bandwidth that is wider than the one provided by a single gain material alone and still conserve the excellent thermal properties of each disk. In these first proof-of-principle experiments we demonstrate pulse durations shorter than previously achieved with the single gain material Yb:Lu2O3. The oscillator generates pulses as short as 103 fs at a repetition rate of 41.7 MHz and a center wavelength of around 1038 nm, with an average output power of 1.4 W. A different cavity layout provides pulses with a duration of 124 fs at an output power of 8.6 W. This dual-gain approach should allow for further power scaling of TDLs and these first results prove this method to be a promising new way to combine the record output-power performance of modelocked TDLs with short pulse durations in the sub-100 fs regime.
我们首次展示了一种SESAM锁模薄片激光器（TDL），该激光器在单个TDL谐振器中集成了两种具有不同发射光谱的增益材料。本实验中使用的两种增益介质是倍半氧化物材料Yb:Lu2O3和Yb:Sc2O3，它们的光谱发射峰偏移了约7 nm。我们可以受益于比单一增益材料单独提供的增益带宽更宽的组合增益带宽，同时仍保留每个薄片的优异热性能。在这些首次原理验证实验中，我们展示了比之前使用单一增益材料Yb:Lu2O3所实现的更短的脉冲持续时间。该振荡器在重复频率为41.7 MHz、中心波长约为1038 nm时产生短至103 fs的脉冲，平均输出功率为1.4 W。一种不同的腔布局在输出功率为8.6 W时提供持续时间为124 fs的脉冲。这种双增益方法应该能够进一步扩大TDL的功率，这些初步结果证明这种方法是一种很有前景的新方法，可将锁模TDL创纪录的输出功率性能与亚100 fs范围内的短脉冲持续时间相结合。
