Abstract
We present a single-longitudinal-mode Ho:Sc2SiO5 (Ho:SSO) laser pumped by a Tm:YAP laser for the first time. Two intra-cavity Fabry–Perot etalons were used to realize the single-longitudinal mode of operation. The maximum output power of 590 mW at 2111.91 nm was obtained with the incident power of 10.2 W, when the slope efficiency was 9.7% and the optical conversion efficiency was 5.8%. The M2 factor of the single longitudinal mode Ho:SSO laser was measured to be 1.17.
Highlights
Two-micrometer single-longitudinal-mode (SLM) lasers have become an attractive research topic due to their dramatic advantages
We report an SLM Ho:Sc2 SiO5 (SSO) laser with two intra-cavity F–P etalons, which was pumped by a Tm:YAP laser
In order to keep Tm:YAP crystal at 18 ◦ C, a thermoelectric cooler (TEC) was used to precisely control the temperature of the Tm:YAP crystal, which was placed in a copper heat-sink and wrapped in indium foil
Summary
Two-micrometer single-longitudinal-mode (SLM) lasers have become an attractive research topic due to their dramatic advantages. It is safe for eyes and it has fine transparency in the atmosphere [1,2]. The narrow width and the high quality of the laser are needed in spectroscopic measurements. There are several traditional methods to obtain SLM lasers, such as microchip lasers [4], torsion mode cavities [5], non-planar ring cavities [6], and coupled cavities with intra-cavity high-loss Fabry–Perot (F–P) etalons [7], which are the easiest methods of obtaining tunable SLM laser output.
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