帮我检查这段话的逻辑并精简润色：The unfavorable up-conversion loss which is strongly related to dopant concentration is the crucial factor in limiting the high output power of TmHoYAG laser and efficient operation ma

The crucial factor limiting the high output power and efficient operation of Tm,Ho:YAG laser is the unfavorable up-conversion loss, which strongly depends on dopant concentration. Typically, the dopant concentrations of Tm3+ and Ho3+ range from 4% to 6% and 0.3% to 1.5%, respectively. However, high Tm3+ concentration leads to excessive heat generation due to the linearly dependent up-conversion processes, which compromises laser performance, especially under intense pumping. Therefore, while high dopant concentration ensures high absorption efficiency and efficient cross-relaxation, it has few disadvantages and should be carefully considered.