Broadband emission and flat optical gain glass containing Ag aggregates for tunable laser

Abstract

Spectroscopic properties of Sm3+‐doped borate glass with silver aggregates were investigated, and it was found that the glass presented broad excitation and emission band covering violet‐infrared region. Furthermore, the optical gain coefficients at various wavelengths were measured via an amplified spontaneous emission technique, it was confirmed that the glass displayed flat net optical gain coefficient in almost full visible region. In addition, the fluorescent temperature quenching of the glass was examined, and it was seen that about 50% of room temperature emission intensity was kept when the sample was heated up to 325°C.

Full color white light, temperature self‐monitor, and thermochromatic effect of Cu+ and Tm3+ codoped germanate glasses

“…In the fitting process, the activation energy ∆E is confirmed to be 0.298 eV. From the above analysis, it is known that the developed Cu + /Tm 3+ co‐doped glass also displayed luminescence temperature quenching as the other luminescence materials do 45,46 . From Figure 8, it can be seen that the temperature quenching of Tm 3+ emissions is not obvious especially at relatively low temperature, this again confirms that the internal quantum efficiency of 1 D 2 of Tm 3+ is higher.…”

“…From the above analysis, it is known that the developed Cu + /Tm 3+ co-doped glass also displayed luminescence temperature quenching as the other luminescence materials do. 45,46 From Figure 8, it can be seen that the temperature quenching of Tm 3+ emissions is not obvious especially at relatively low temperature, this again confirms that the internal quantum efficiency of 1 D 2 of Tm 3+ is higher. The temperature quenching for the Cu + emissions is greater than that of Tm 3+ emissions, thus indicating that the temperature stability of Cu + emission is mediocre.…”

Net Optical Gain Coefficients of Cu+ and Tm3+ Single-Doped and Co-Doped Germanate Glasses

“…The differences between the NOGCs for the single-doped and co-doped glasses will be further explicated in future studies of the luminescence lifetime. Compared with the NOGCs at 2037 nm emission of the Ho 3+ /Tm 3+ /Ce 3+ tri-doped tellurite glasses (1.13 cm −1 ) [ 22 ], at 570 nm emission of the Sm 3+ /silver-aggregate-doped borate glass (2.27 cm −1 ) [ 7 ], and at 1.8 μm emission of the Er 3+ /Tm 3+ co-doped lead silicate glasses (1.12 cm −1 ) [ 23 ], the higher NOGCs of the Tm 3+ and Cu + co-doped samples indicate that the Tm 3+ and Cu + co-doped germanate glasses are a promising candidate for broadband tunable solid-state lasers. The relationship between NOGCs and wavelength for the co-doped glass is presented in Figure 4 c. As can be seen, the NOGC values of Tm 3+ and Cu + co-doped germanate glasses stayed within a stable range at different wavelengths.…”

“…To achieve a more efficient transmission network, an attractive method is to increase the number of transmission channels by broadening the gain bandwidth [ 6 ]. In addition, broadband tunable laser sources, which are widely used in scientific research, also require broadband solid-state gain media [ 7 ]. Therefore, there is growing interest in the development of continuous-wave (CW) broadband solid-state lasers.…”