Abstract
We theoretically demonstrate a model which can be used to analyze frequency up-conversion of a laser wavelength by using thermal population. The proposed model uses a rate equation model of ytterbium-doped fiber with thermal population effect. The rate and power propagation equations are set up and numerically analyzed to elucidate the dependence of frequency up-conversion efficiency and thermal-optical conversion efficiency on ambient thermal power. The analytical techniques and numerical results show that using pump laser at 1 000 nm, the wavelength can be converted into 900 nm with an up-conversion quantum efficiency of about 99.97% and a cooling efficiency of about 11.1%. This theoretical model is a promising candidate for vast applications in energy-efficient laser and energy-utilizing field.
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Foundation item: the National Natural Science Foundation of China (Nos. 60377023 and 60672017), the Program for New Century Excellent Talents in Universities (NCET), and the Shanghai Optical Science and Technology Project (No. 05DZ22009)
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Nkonde, S., Jiang, C. Lasing Frequency Up-Conversion by Using Thermal Population. J. Shanghai Jiaotong Univ. (Sci.) 24, 579–583 (2019). https://doi.org/10.1007/s12204-019-2116-0
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DOI: https://doi.org/10.1007/s12204-019-2116-0