Dependence of the Yb^3+ emission cross section and lifetime on temperature and concentration in yttrium aluminum garnet

High-Power and High Efficiency Yb:YAG Ceramic Laser at Room Temperature

“…(Saikawa et al, 2002) Very recently, we have reported the first study of a tunable Yb:YAG ceramic laser (Nakamura et al, 2008b) that exhibits continuous tunability with a spectral range of 63.5 nm from 1020.1 to 1083.6 nm for T = 1% at a maximum output power of 1.6 W. In this section, we investigated the broader tunability range of a 1.4 W Yb:YAG ceramic laser using a 1% output coupler and a prism; this range was twofold broader than that in our previous work. (Nakamura et al, 2008b) Comparing the emission spectra of a Yb:YAG crystal (Dong et al, 2003) doped with 10 at.% Yb 3+ and the ceramic Yb:YAG (Dong et al, 2006) with 9.8 at.% Yb 3+ reported by Dong et al, we found that the ceramic Yb:YAG had a slightly higher emission intensity and the possibility of producing shorter-wavelength oscillation than the crystal Yb:YAG. To consider the difference in the emission spectra in the short-wavelength region, we employed a dichroic mirror (DM; Layertec No.…”

DiPOLE - An Efficient and Scalable High Pulse Energy and High Average Power Cryogenic Gas Cooled Multi-Slab Amplifier Concept

“…The operating temperature quoted corresponds to the helium gas temperature measured at the input to the amplifier. The saturation fluence for the amplifier is between 2.4 J/cm 2 and 3.7 J/cm 2 for temperatures between 100 K and 175 K, respectively, based on reported emission cross-section data of Dong et al [7]. Numerical model predictions with and without the inclusion of ASE losses are also shown in Fig.…”

Concentration-Dependent Laser Performance of Yb:YAG Ceramics and Passively Q-switched Yb:YAG/Cr,Ca:YAG Lasers

“…The thin disk laser has been demonstrated to be a good way to generate high power with good beam quality owing to the efficiently cooling of gain medium and good overlap of the pump beam and laser beam (Giesen et al, 1994). However, in the thin disk case, the pump beam must be folded many times into thin laser gain 3 pump wavelength of 941 nm and laser wavelength of 1030 nm) (Fan 1993) of Yb:YAG gain medium and easy growth of high quality and moderate concentration crystal without concentration quenching (Patel et al, 2001), smaller emission cross section of Yb:YAG (about one tenth of that for Nd:YAG) (Dong et al, 2003) is more suitable to obtain high pulse energy output than Nd:YAG in passively Q-switched solid-state lasers. Another interest in Yb:YAG lasers is that the frequency doubled wavelength of 515 nm matches the highest power line of Ar-ion lasers, thereby leading to the possibility of an all solid-state replacement (Fan & Ochoa 1995).…”