Infrared laser stimulated broadband white emission of transparent Cr:YAG ceramics obtained by solid state reaction sintering

• Published in: Optical materials Vol. 111; p. 110673
• Main Authors: Chaika, M.A., Tomala, R., Strek, W.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2021
• Subjects: Ceramics; Cr:YAG; Intervalence charge transfer; Tetravalent chromium; White light emission; Cr:YAG; White light emission; Intervalence charge transfer; Ceramics; Tetravalent chromium
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2020.110673

In the present work, the Light Induced White Emission (LIWE) was investigated as one of the sources of laser loss in transparent Cr:YAG ceramics. We have found that transparent Cr:YAG ceramics is capable of generating bright LIWE at excitation powers above a certain threshold. Intensity of LIWE strongly depends on the excitation power and ambient pressure. The host temperature estimated from Cr3+ luminescence was found to be below 600 °C, while the most intense white emission was found between 50 and 400 °C. The mechanism of the laser induced white emission was discussed in terms of Intervalence Charge Transfer (IVCT) in chromium mixed valence pair. •We have found that transparent Cr:YAG ceramics is capable of generating bright LIWE.•The host temperature estimated from Cr3+ luminescence was found to be below 600 °C.•The most intense white emission was found between 50–400 °C.•The laser induced white emission was discussed in terms of Intervalence Charge Transfer (IVCT) in chromium mixed valence pair.