Simultaneous passively Q-switched dual-wavelength solid-state laser working at 1065 and 1066 nm.
ABSTRACT A passively Q-switched dual-wavelength solid-state laser is presented. The two wavelengths are emitted by two different crystals in order to avoid gain competition, and the synchronization between the pulses is obtained by external triggering of the saturable absorber. Sum frequency mixing is demonstrated, proving the interest of this source for terahertz generation in the 0.3-0.4 THz range through difference frequency generation.
SourceAvailable from: V. G. Tunkin[Show abstract] [Hide abstract]
ABSTRACT: We describe a compact dual-wavelength (1.047 and 1.053 μm) diode end-pumped Q -switched Nd:YLF laser source which has a number of applications in demand. In order to achieve its dual-wavelength operation it is suggested for the first time to use essentially nonmonotonous dependences of the threshold pump powers at these wavelengths on the cavity length in the region of the cavity semiconfocal configuration under a radius of the pump beam smaller than the radius of the zero Gaussian mode. Here we demonstrate one of the most interesting applications for this laser: difference frequency generation in a GaSe crystal at a frequency of 1.64 THz. A superconducting hot-electron bolometer is used to detect the THz power generated and to measure its pulse characteristics.Laser Physics Letters 01/2014; 11(1-1):015004. DOI:10.1088/1612-2011/11/1/015004 · 2.96 Impact Factor
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ABSTRACT: Multi-wavelength emissions have been demonstrated in many disordered laser crystals. Improving the emission controllability is crucial for their practical applications. However, it is difficult because the closely adjacent laser components cannot be effectively adjusted by the traditional resonator design. In this paper, the anisotropy of laser emission in a monoclinic, disordered crystal Nd:LuYSiO<sub>5</sub> (Nd:LYSO) is reported for the first time. By selecting crystal orientation, high power laser emission with different wavelengths and polarizations were obtained. For X-cut sample, 1076 nm single-wavelength laser output reached 7.56 W, which will be a useful light source for detecting carbonyl-hemoglobin and nitrite after frequency doubling. For Y- and Z-cut samples, 1076, 1079 nm dual-wavelength laser output reached 10.3 W and 7.61 W, with parallel and orthogonal polarizations, respectively, which are convenient to be used as the generation sources of 0.78 THz wave by type-I or type-II difference frequency. The output characteristic is well explained by a theoretical analysis on the stimulated emission cross-section. The present work reveals that the intrinsic anisotropy in disordered laser crystal can be utilized to elevate the emission controllability. Accordantly, the material's application scopes can be extended.Optics Express 02/2014; 22(3):2228-35. DOI:10.1364/OE.22.002228 · 3.53 Impact Factor
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ABSTRACT: A two-frequency picosecond laser based on α-cut Nd:YVO4–YVO4 composite vanadate crystals is experimentally studied for the s-polarised radiation at the 4F3/2 – 4I11/2 transition with frequency tuning using Fabry–Perot etalons of different thickness. The difference between the radiation wavelengths was tuned within the range of 1.2–4.4 nm. In the mode-locking regime, the two-frequency radiation power was 280 mW at an absorbed pump power of 12 W.Quantum Electronics 07/2013; 43(7):600. DOI:10.1070/QE2013v043n07ABEH015084 · 0.89 Impact Factor