SINGLE-FREQUENCY TI:SAPPHIRE LASER WITH INTRACAVITY ETALON

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 高分辨率光谱学的准确性通常从根本上受到激发激光的光谱线宽的限制。观测由于光声相互作用引起的发射光的光谱偏移需要亚GHz带宽的激光器。 然而，在宽带模式下操作的Ti：蓝宝石激光器通常产生大约1GHz或更大的带宽。 通过在激光腔内插入标准具，可将钛宝石激光器的线宽缩窄到10 MHz，效率为60~70%。 通过采用有源频率控制，可以以最小的损耗实现线宽进一步减小到500 kHz的范围。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. High resolution spectroscopy is often fundamentally limited in accuracy by the spectral linewidth of the excitation laser. Observing spectral shifts in emission light due to opto-acoustic interactions requires sub-GHz bandwidth lasers. However, Ti:Sapphire lasers operating in broadband mode typically produce a bandwidth on the order of 1 GHz or more. By inserting an etalon in the laser cavity, the Ti:Sapphire laser linewidth can be narrowed to the range of 10 MHz with 60~70% efficiency. Further reduction in linewidth to the range of 500 kHz can be achieved with minimal loss by employing active frequency control.