Atement: Not applicable. Conflicts of Interest: The authors declare no conflict of interest.
hvphotonicsCommunicationAn Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nmRotem Nahear, Neria Suliman, Yechiel Bach and Salman Noach Department of Applied Physics, Electro-Optics Engineering Faculty, Jerusalem College of Technology, Jerusalem 9372115, Israel; [email protected] (R.N.); [email protected] (N.S.); [email protected] (Y.B.) Correspondence: [email protected]: This paper presents a KGW Raman laser with an external-cavity configuration inside the two area. The Raman laser is pumped by unique, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is based on a KLTN crystal, enabling the use of a short crystal length, having a relatively low driving voltage. As a result of KGW bi-axial properties, the Raman laser is able to lase separately at two unique output wavelengths, 2273 and 2344 nm. The output YTX-465 Formula energies and pulse durations for these two lines are 0.42 mJ/pulse at 18.two ns, and 0.416 mJ/pulse at 14.7 ns, respectively. That is the first implementation of a KGW crystal pumped by an electro-optic active Q-switched Tm:Yap laser in the SWIR spectral range. Key phrases: strong state laser; two laser; Raman laser; KGW crystal; active Q-switch; electro-optics1. Introduction Lasers emitting at two improve a wide variety of applications simply because of their reasonably high absorption coefficients and also the intriguing atmospheric window at this spectral variety. They are employed in LIDAR; microsurgery [1]; the processing of polymers, semiconductors, and metals [2]; defense applications; and gas sensing industries [3]. However, SWIR solid-state laser technologies, specifically inside the area of 2 , has but to be fully mature, currently relying on a restricted range of doped-crystalline and rare-earth ions, including thulium, holmium, and chromium. The current technologies permits the generation of laser sources in aspect in the two spectral variety, but doesn’t cover it totally. Raman lasers leverage the principles of stimulated Raman scattering (SRS) to shift the light that comes into the crystal by a frequency corresponding towards the vibrational frequency of your material. Pumping Raman cavities at quite higher peak power densities enables frequency conversion and produces new laser lines and useful high-brightness sources. This extends the spectral spans of current lasers and fills the spectral gaps within this spectral range [4]. Raman lasers possess a handful of more positive aspects, including linewidth narrowing, pulse length shortening, and spatial beam good quality improvement by means of Raman beam cleanup [8]. The achieve of a Raman laser is dependent around the pump intensity and the acquire coefficient in the Raman crystal material. There are only a couple of publications on Raman lasers in the two area, mostly for two causes. The first will be the lack of suitable higher power pump sources for this spectral variety. The second is definitely the reduce within the Raman get coefficient at longer wavelengths, which can be roughly proportional to inverse wavelength. The outcome of these two reasons is reduced efficiency Raman lasers when compared with VIS and NIR. The first demonstrations of SRS conversion in two using Tm:KY(WO4 )two and BaWO4 Scaffold Library web crystals were reported more than a decade ago [9,10]. Having said that, these reports are missing the details regarding the obtained output power values. Considering the fact that 2013, many studies have demonstrated cry.