Kinetic and spectroscopic investigations of Yb:YCa4O(BO3)3 (Yb:YCOB) single crystals

Continuous-Wave and Passive Q-Switching Laser Performance of Yb:YCa<inline-formula><tex-math>$_{\bf 4}$ </tex-math></inline-formula>O(BO<inline-formula><tex-math>$_{\bf 3}$</tex-math></inline-formula>)<inline-formula> <tex-math>$_{\bf 3}$</tex-math></inline-formula> Crystal

“…The emission spectrum remains nearly unchanged over this pump power range, this ensures the absence of absorption variation caused by wavelength changing, as occurred in the case of a previously reported Yb:YCOB laser [6]. The smallsignal (unsaturated) absorption, η a = 0.90, is very close to the calculated value of 0.93 if an averaged absorption cross-section of σ a = 1.0 × 10 −20 cm 2 is taken [15]. The step of data appearing at P in = 1.0 W was caused by range changing of the power meter during the measurement.…”

Growth and spectral properties of Yb:Ca0.28Ba0.72Nb2O6 disordered crystal

“…For this crystal, the E ZL is equal to 10288 cm −1 and the value of Z l /Z u is 0.60. The emission cross-section is 0.27 × 10 −20 cm 2 at 1007 nm, which is much larger than the reported values of 0.12 × 10 −20 cm 2 [6], 0.2 × 10 −20 cm 2 [28], and 0.16 × 10 −20 cm 2 [29] for Yb:Ca 4 YO(BO 3 ) 3 , Yb:Sr 3 Y(BO 3 ) 3 , and Yb:CaF 2 , respectively. According to the absorption and fluorescence spectra, the Stark energy levels at room temperature were determined.…”

“…In the fluorescence intensity of 5 at.% Yb:CBN, there are three broad bands centered at 977, 1008, and 1078 nm, respectively, and the full wave at half maximum (FWHM) is as high as 68 nm, which is 8 times than that of Yb:YAG (8.5 nm) [24], making it an attractive gain medium for ultrashort pulse generation. Other Yb 3+ -doped disordered gain mediums such as Yb:Ca 4 YO(BO 3 ) 3 , Yb:NaY(WO 4 ) 2 , Yb:CaGdAlO 4 , and Yb:CNNG have fluorescence spectrums with FWHM bandwidth of about 65 [6], 48 [9], 57 [10], and 21 nm [12], respectively. The inhomogeneous broadening fluorescence spectrum is remarkably smooth and is a result of disordered crystal structure which offers disordered replacement by doped Yb 3+ ions.…”

“…The broader emission spectra are favorable for developing diode-pumped ultrashort laser and tunable laser systems by mode-locking techniques. Thus, various Yb 3+ -doped crystals have been investigated in the femtosecond laser and tunable laser, especially disordered crystals with considerable inhomogeneous broadening of the optical spectra, such as Ca 4 Y(BO 4 ) 3 O [6,7], NaY(WO 4 ) 2 [8,9], CaGdAlO 4 [10], CaNb 2 O 6 [5,11], and CNGG [12,13], etc., which generated stable pulses of 35, 53, 47, 251, and 73 fs, respectively. Hence, Yb 3+ -doped disordered gain media have proven themselves as viable alternatives as femtosecond source generators.…”

Yttrium

“…Crdoped Y 3 Al 5 O 12 (YAG-Cr) increased their emission intensity with increasing firing temperature and the intensities observed for phosphorus powder (Matsubara et al 2000). The results of a comparison of spectral and luminescence properties of YCOB and certain other yttrium-containing crystals indicate that these crystals are very good elements for the construction of diode-pumping tunable lasers with supershort pulses of light generation (Lebedev and Voroshilov 2000).…”