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 BMS-8 medchemexpress College of Technologies, 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 in the 2 region. The Raman laser is pumped by distinctive, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is primarily based on a KLTN crystal, enabling the use of a quick crystal length, having a comparatively low driving voltage. Due to the KGW bi-axial properties, the Raman laser is in a position to lase separately at two distinct output wavelengths, 2273 and 2344 nm. The output energies and pulse durations for these two lines are 0.42 mJ/pulse at 18.2 ns, and 0.416 mJ/pulse at 14.7 ns, respectively. This can be the initial implementation of a KGW crystal pumped by an electro-optic active Q-switched Tm:Yap laser within the SWIR spectral range. Keywords: strong state laser; 2 laser; Raman laser; KGW crystal; active Q-switch; electro-optics1. Introduction Lasers emitting at two enhance a wide selection of applications because of their fairly high absorption Cholesteryl sulfate web coefficients and the intriguing atmospheric window at this spectral range. They’re utilized in LIDAR; microsurgery [1]; the processing of polymers, semiconductors, and metals [2]; defense applications; and gas sensing industries [3]. Even so, SWIR solid-state laser technologies, especially within the area of 2 , has but to be fully mature, at present relying on a restricted array of doped-crystalline and rare-earth ions, such as thulium, holmium, and chromium. The current technology makes it possible for the generation of laser sources in part in the two spectral range, but does not cover it totally. Raman lasers leverage the principles of stimulated Raman scattering (SRS) to shift the light that comes in to the crystal by a frequency corresponding for the vibrational frequency with the material. Pumping Raman cavities at quite higher peak power densities enables frequency conversion and produces new laser lines and helpful high-brightness sources. This extends the spectral spans of existing lasers and fills the spectral gaps in this spectral range [4]. Raman lasers have a couple of additional positive aspects, for example linewidth narrowing, pulse length shortening, and spatial beam quality improvement via Raman beam cleanup [8]. The gain of a Raman laser is dependent around the pump intensity as well as the obtain coefficient of your Raman crystal material. You can find only a number of publications on Raman lasers inside the 2 region, mostly for two causes. The first could be the lack of suitable high energy pump sources for this spectral range. The second could be the reduce within the Raman get coefficient at longer wavelengths, that is around proportional to inverse wavelength. The outcome of those two motives is reduce efficiency Raman lasers when compared with VIS and NIR. The first demonstrations of SRS conversion in 2 applying Tm:KY(WO4 )2 and BaWO4 crystals had been reported greater than a decade ago [9,10]. Nevertheless, these reports are missing the information about the obtained output power values. Considering that 2013, several studies have demonstrated cry.