帮我检查逻辑并按照SCI论文标准润色下面这段话：In 1993 Bowman studied the performance of a side-pumped TmHoYAG laser with varying dopant concentrations of the crystal but only obtained an average output power of 76W 13 as t

In 1993, Bowman conducted a study on the performance of a side-pumped Tm,Ho:YAG laser with varying dopant concentrations of the crystal. However, the results showed that the system suffered from detrimental up-conversion losses, which only allowed for an average output power of 7.6W [13]. It was not until 2014 that Zhang Chao et.al employed two side-pumped laser modules with Tm:YAG and Tm,Ho:YAG in the same cavity, which generated a continuous wave (cw) output power of 37W at 2.1μm [14]. This is currently the highest 2.09μm output power achieved with co-doped Tm,Ho:YAG. However, the optical-to-optical efficiency for this system is only 3.1%.