Spectroscopic and de-excitation properties of (Cr,Nd):YAG transparent ceramics

Concentration-dependent fluorescence decay and energy transfer in Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic powder

“…Lupei and co-workers reported a rapid energy transfer process that was termed "superexchange ET". 20) Despite our careful observation, such a rapid energy transfer was not detected in our samples. This difference may be related to the ceramic manufacturing process (sol-gel method or solid-state reaction synthesis).…”

“…15) The process of energy transfer from Cr 3+ to rare-earth ions doped in garnet crystals has been reported by several researchers. [15][16][17][18][19][20] In our previous report, the fluorescence decay of Nd 3+ in Nd/Cr:YAG ceramics that follows Cr 3+ excitation that was calculated using rate equations, including dipole-dipole interactions and energy transfer via excitation energy migration into the rate equations, was consistent with experimental results for 293-473 K. 18) Dipole-dipole energy transfer parameters and the rate of energy transfer via excitation energy migration increased rapidly with an increase in temperature, and the energy transfer efficiency increased slightly. 18) Therefore, Nd/Cr:YAG ceramics can operate without sacrificing performance even at the high temperatures that are generated during pumping with a flash lamp.…”

“…18) Therefore, Nd/Cr:YAG ceramics can operate without sacrificing performance even at the high temperatures that are generated during pumping with a flash lamp. Lupei et al 20) reported the concentration dependence of the energy transfer efficiency from Cr 3+ to Nd 3+ in YAG. They showed that an increase in Nd 3+ concentration increased the energy transfer efficiency more effectively than increasing the Cr 3+ concentration.…”

Rod-Type Ce/Cr/Nd : YAG Ceramic Lasers with White-Light Pump Source

“…Nd/Cr : YAG ceramic lasers that have pure Cr 3+ ions were developed at the first time [19]. Many optical properties of Nd/Cr : YAG ceramic laser were investigated [13,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Subsequently, many laser systems with Nd/Cr : YAG ceramics pumped by lamp light and solar light were reported [4,13,20,29,32,33,35,37,38].…”

Analyses of energy transfer of Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic powders at the 4 T 1 level of Cr3+ ion excitation

“…[11][12][13][14][15][16] However, melt-grown Nd/Cr:YAG single crystal is difficult to fabricate because of the partial transformation of Cr 3+ to Cr 4+ . 17) The Cr 4+ in YAG has a near-infrared absorption band that matches the emission wavelength of Nd:YAG, which degrades the laser performance. Interest in co-doping of laser materials has been revitalized with the advent of polycrystalline laser materials produced using transparent ceramic techniques.…”