https://ph04.tci-thaijo.org/index.php/SUJST <p>The journal aims to provide a medium for the dissemination of advances in engineering, science, agricultural technology, medicine and public health, and related technology. All contributions that have not been published in other journals, reports, proceedings or other types of publications are welcomed. Contributions are accepted only in English and may be research papers, short communications, or review articles. </p> <p>Continuing efforts have been made by the editorial board members to maintain the high quality of the journal by single-blind peer-review in careful and fair manner. A special attention has been focused therefore on the novelty and readers' benefit together with practical applicability if necessary. All the accepted manuscripts are edited by a specialist who is a native and professionally-educated English speaker.</p> Institute of Research and Development en-US Suranaree Journal of Science and Technology 0858-849X https://ph04.tci-thaijo.org/index.php/SUJST/article/view/10033 <p>The influence of the alkali-earth ions (Mg²⁺, Ca²⁺, Sr²⁺) on structural (FTIR) and spectroscopic (optical absorption and near infrared emission) properties of Nd³⁺-doped lithium aluminophosphate glasses were systematically examined and discussed. Under an excitation wavelength of 580 nm, the emission spectra of Nd³⁺-doped glasses showed three prominent peaks at 900, 1058, and 1327 nm, it was related to the ⁴F_3/2 ⁴I_9/2, ⁴I_11/2, and ⁴I_13/2 transitions, respectively. It was found that the peak emission intensity occurs at a wavelength of 1058 nm. The &nbsp;were calculated by applying Judd-Ofelt theory to the absorption and emission measurements, which resulted in the radiative transition probability and stimulated emission cross-section being calculated. As a result, when compared to , , and , have a larger compositional dependency on ionic radius and modifier content. In addition, it was found that the stimulated emission cross-section of , respectively. The luminescence intensity is greatly increased, and the underlying mechanism is clearly seen when cationic replacements of Sr²⁺, Ca²⁺, and Mg²⁺ are carried out. The research proved that spectroscopic properties of trivalent Nd³⁺ depend significantly on the kind of presence of alkali-earth ions in glass host matrices and could be used as a lasing application.</p> Phalada Thongyoy Chittra Kedkaew Piyachat Meejitpaisan Rajanavaneethakrishna Rajaramakrishna Nuttawadee Intachai Suchart Kothan Natthakridta Chanthima Pham Hong Minh Thanapong Sareein Copyright (c) 2025 Suranaree Journal of Science and Technology 2025-06-13 2025-06-13 32 3 030296(1 11) 10.55766/sujst10033