El-Agmy, R.M. and Al-Hosiny, N.M. 2019. Thermal analysis and CW laser operation at 1.998 µm in end pumped Tm:YAP lasers. Photonics Letters of Poland. 11, 4 (Dec. 2019), 103–105. DOI:https://doi.org/10.4302/plp.v11i4.938.