Bell, Lebohang TKgomo, Mosima BNgcobo, Sandile2020-06-102020-06-102020-05Bell, L. T., Kgomo, M.B. and Ngcobo, S. 2020. Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes. Optics Express, vol. 28(11): 16907-169231094-4087https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-11-16907https://doi.org/10.1364/OE.385569http://hdl.handle.net/10204/11458© 2020 Optical Society of America under the terms of the OSA Open Access Publishing AgreementIn this article, we demonstrate selective excitation of second harmonic higher-order modes inside a diode end-pumped solid-state laser resonator that comprises of a nonlinear potassium titanyl phosphate (KTP) crystal and a digitally addressed holographic end-mirror in a form of a reflective phase-only spatial light modulator (SLM). The emitted second harmonic higher-order modes at 532 nm are generated by an intracavity nonlinear KTP crystal that is pumped by high-order fundamental modes operating at 1064 nm. The fundamental modes are digitally controlled by displaying a computer-generated hologram in the formof a grey-scale image to the SLM screen for on-demand high-order modes. The phase matching of the fundamental mode to the generated frequency-doubled mode is achieved by controlling the phase of the digital hologram to either achieve a high or quasi-degree of orbital angular momentum conservation. We show that we can intracavity generate frequency-doubled high-order Laguerre-Gaussian modes and Hermit-Gaussian modes that are either quasi or fully reproducible in the far-field. To the best of our knowledge, this is the first laser to generate frequency-doubled on-demand higher-order modes inside the cavity at the visible (green) wavelength of 532 nm.enDigital lasersSpatial light modulatorNonlinear opticsKTPSolid state lasersArticleBell, L. T., Kgomo, M. B., & Ngcobo, S. (2020). Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes. http://hdl.handle.net/10204/11458Bell, Lebohang T, Mosima B Kgomo, and Sandile Ngcobo "Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes." (2020) http://hdl.handle.net/10204/11458Bell LT, Kgomo MB, Ngcobo S. Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes. 2020; http://hdl.handle.net/10204/11458.TY - Article AU - Bell, Lebohang T AU - Kgomo, Mosima B AU - Ngcobo, Sandile AB - In this article, we demonstrate selective excitation of second harmonic higher-order modes inside a diode end-pumped solid-state laser resonator that comprises of a nonlinear potassium titanyl phosphate (KTP) crystal and a digitally addressed holographic end-mirror in a form of a reflective phase-only spatial light modulator (SLM). The emitted second harmonic higher-order modes at 532 nm are generated by an intracavity nonlinear KTP crystal that is pumped by high-order fundamental modes operating at 1064 nm. The fundamental modes are digitally controlled by displaying a computer-generated hologram in the formof a grey-scale image to the SLM screen for on-demand high-order modes. The phase matching of the fundamental mode to the generated frequency-doubled mode is achieved by controlling the phase of the digital hologram to either achieve a high or quasi-degree of orbital angular momentum conservation. We show that we can intracavity generate frequency-doubled high-order Laguerre-Gaussian modes and Hermit-Gaussian modes that are either quasi or fully reproducible in the far-field. To the best of our knowledge, this is the first laser to generate frequency-doubled on-demand higher-order modes inside the cavity at the visible (green) wavelength of 532 nm. DA - 2020-05 DB - ResearchSpace DP - CSIR KW - Digital lasers KW - Spatial light modulator KW - Nonlinear optics KW - KTP KW - Solid state lasers LK - https://researchspace.csir.co.za PY - 2020 SM - 1094-4087 T1 - Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes TI - Digital laser for on-demand intracavity selective excitation of second harmonic higher-order modes UR - http://hdl.handle.net/10204/11458 ER -