Details

Autor(en) / Beteiligte

• Antonov, V A
• Firsov, K N
• Gavrishchuk, E M
• Ikonnikov, V B
• Kononov, I G
• Kotereva, T V
• Kurashkin, S V
• Podlesnykh, S V
• Rodin, S A
• Savin, D V
• Sirotkin, A A
• Titirenko, A M
• Zhavoronkov, N V

Titel

Luminescent and lasing characteristics of polycrystalline Cr:Fe:ZnSe exited at 2.09 and 2.94 µm wavelengths

Ist Teil von

• Laser physics letters, 2019-08, Vol.16 (9)

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The luminescence of Cr2+ and Fe2+ in Cr:Fe:ZnSe polycrystals excited at room temperature by pulsed lasers at wavelengths of 2.09 and 2.94 m was studied. For comparison, we also studied the luminescence in single crystals and polycrystals of Fe:ZnSe with iron ion concentration in the range from 5.6  ×  1018 to 5.7  ×  1019 cm−3. Doping of the polycrystalline samples was carried out using a high-temperature diffusion process with subsequent control of the dopants concentration distribution over the crystal depth. The dependence of the luminescence lifetime τlt of Fe2+ ions on the dopants concentration in crystals excited at a wavelength of 2.94 m was obtained. It was found that chromium quenches the luminescence of Fe2+ no less actively (if no more) than iron itself. The τlt values were measured for Fe:ZnSe excited at a wavelength of 2.94 m and Cr:Fe:ZnSe samples with the same maximum Fe2+ ions concentrations ( 0.9  ×  1019 cm−3) at wavelengths of 2.94 m and 2.09 m. A noticeable increase in τlt value and luminescence rise time was observed in Cr:Fe:ZnSe crystals excited at a wavelength of 2.09 m (τlt     460 ns) compared to 2.94 m (τlt     240 ns). For comparison, the value of τlt in Fe:ZnSe was about 340 ns. The obtained results confirm the fast energy transfer in Cr:Fe:ZnSe crystals from excited chromium ions to iron ions. The output characteristics of lasers on Fe:ZnSe and Cr:Fe:ZnSe polycrystalline active elements with pumping by HF laser radiation were compared. The slope efficiency with respect to the absorbed energy of Cr:Fe:ZnSe lasers was significantly lower, and the generation threshold was two times higher than for Fe:ZnSe lasers. The prospects for creating a room temperature laser, in which the excitation of iron ions will be carried out through energy transfer from chromium ions, are analyzed.