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Optics Communications

Synthesis of white laser source based on nonlinear frequency conversion with stimulated Raman adiabatic passage

Fujie Li, Zhonghao Zhang, Ting Wan, Handa Zhang, Changshui Chen

Published Sep 2, 2021• 10 citations
Publisher
DOI
10.1016/j.optcom.2021.127427

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Abstract In recent years, a series of adiabatic passage techniques for atomic systems have been introduced into the field of nonlinear optics. We propose a theoretical model of the fourth-order three-process cascaded frequency conversion technique based on fractional stimulated Raman adiabatic passage (FSTIRAP). Building upon the STIRAP technique, the FSTIRAP technique splits the original third pump laser into two separate pump lasers, each subjected to Gaussian modulation. This achieves the simultaneous output of the first idler laser and the second idler laser with tunable output ratios at the end of the crystal, while ensuring the complete conversion of the signal laser. Numerical simulation results demonstrate that the FSTIRAP technique enables highly efficient frequency conversion, with the total conversion efficiency showing robustness across a wide range of pump laser intensities, coupling delay parameters, and crystal temperatures. Additionally, the output ratio of the first idler laser to the second idler laser can be controlled by independently tuning the delay parameter or the crystal temperature.
A cascaded sum frequency generation (SFG) conversion scheme based on the stimulated Raman adiabatic passage (STIRAP) technique is proposed for generating an ultraviolet laser radiation at 228 nm. The conversion involves two simultaneous SFG processes, in which the signal laser radiation is converted to ultraviolet laser radiation through a negligible intermediate laser radiation. Dark state expressions and adiabatic conditions are given. Numerical simulations demonstrate the efficient conversion processes in a nonlinear LaBGeO 5 (LBGO) crystal, and the effects of the coupling modulation function, pump laser intensity, and temperature on the quantum conversion efficiency are investigated. Tunable output of ultraviolet laser radiation in the 210–250 nm range is achieved by varying the signal or pump laser radiation wavelength while maintaining other input parameters. The large amount of optical data obtained in this work will contribute to the generation of deep ultraviolet laser sources based on nonlinear cascaded frequency conversion.
Abstract Nonlinear optical frequency conversion techniques enable the generation of new laser frequencies that are not directly accessible from laser sources. Lasers at different frequencies have distinct applications across various fields, including fiber-optic communication, medical imaging, material processing, display panel manufacturing, and biomolecular detection. We propose a theoretical model for four-process cascaded frequency conversion based on the chainwise stimulated Raman shortcut-to-adiabatic passage (C-STIRSAP) counter-diabatic (CD) driving technique. The model modifies the coupling functions of the chainwise stimulated Raman adiabatic passage (C-STIRAP) scheme by using the shortcuts to adiabaticity (STA) CD-driving method. Numerical simulation results demonstrate that the C-STIRSAP CD-driving technique allows efficient four-process frequency conversion over a wide range of delay and width parameters. Furthermore, it enhances the robustness of the process against variations in temperature and signal wavelength.