Franczyk, Marcin, Ryszard Stępień, Dariusz Pysz, Ireneusz Kujawa, and Ryszard Buczyński. “Phosphate Yb3+ Doped Air-Cladding Photonic Crystal Fibers for Laser Applications”. Photonics Letters of Poland 6, no. 1 (March 31, 2014): pp. 47–49. Accessed November 20, 2024. http://m.photonics.pl/PLP/index.php/letters/article/view/6-17.