UV-VIS absorption and NIR-stimulated emission of Nd³⁺: PVA films

• Published in: Journal of applied polymer science Vol. 113; no. 2; pp. 887 - 895
• Main Authors: Adiyodi, Amrutha K, Jyothy, P.V, Unnikrishnan, N.V
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.07.2009; Wiley
• Subjects: Amplification; Applied sciences; Computational efficiency; Cross sections; Electrical, magnetic and optical properties; Emission; Exact sciences and technology; Judd-Ofelt parameters; Mathematical analysis; neodymium; Organic polymers; Physicochemistry of polymers; polyvinyl alcohol; Polyvinyl alcohols; Properties and characterization; rare earth; Stimulated emission; Transition probabilities; Fluorescence; Luminescent material; Experimental study; Judd-Ofelt parameters; Polyvinylalcohol; Stimulated emission; Lanthanide ion; neodymium; Neodymium III Ions; Near infrared spectrum; polyvinyl alcohol; Optical properties; Concentration effect; Doped polymer; Ultraviolet visible spectrum; rare earth; Optical absorption
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.29971

Neodymium-doped polyvinyl alcohol films were prepared and the optical properties of the films were investigated. By applying Judd-Ofelt theory, the Ω parameters were obtained from the absorption spectrum. Various radiative parameters like transition probability for each level (AJ), total transition probability (AT), branching ratio (βR), radiative lifetime (τrad), and absorption cross-section (σA) were calculated. The theoretically obtained branching ratio and integrated absorption cross-section are found to be greater for the transition ⁴F₃/₂ [rightward arrow] ⁴I₁₁/₂. From the emission spectrum peaked at 1064-nm stimulated emission cross-section (σE), the line width (Δλeff) is calculated to be 6.21 x 10⁻²¹ cm² and 41 nm, respectively. Further the variation of the optical gain with the length of the film was studied and the slope efficiency (η = 8.5%) was determined from laser measurements. These results clearly support the potentiality of the Nd³⁺: polyvinyl alcohol films in realizing optical amplification and stimulated emission.