Broadband Spectra and Efficient Laser Performance of a Disordered Nd:Sr0.7La0.3Mg0.3Al11.7O19 Crystal

Abstract

Here, we demonstrate the broadband spectra and efficient laser performance of a disordered Nd:Sr0.7La0.3Mg0.3Al11.7O19 (Nd:ASL) crystal. The polarized absorption and emission spectra were characterized and calculated with the Judd–Ofelt (J–O) theory, and the results show that this crystal has relatively large σ polarized absorption and emission cross sections, with peak emission cross sections of 4.5 × 10−20 cm2 at 1051 nm and an emission width of 30 nm at 1074 nm, which are favorable for pulsed lasers. The laser-diode-pumped continuous-wave (CW) and passively Q-switched lasers at 1051 nm were realized for the first time to our best knowledge. For CW laser, the maximum output power was 1.95 W with the slope efficiency of 42.6%, and for the passive Q-switching, the maximum output power was 0.73 W with the pulse width of 7.96 ns and peak power of 5.64 W. The results demonstrate that Nd:ASL crystal is a potential candidate for lasers, especially high-peak pulsed lasers such as Q-switching and mode-locking.

Enhanced broadband NIR emission in glass–ceramic fibers containing Nd3+/Yb3+ co‐doped YCa4O(BO3)3 disordered nanocrystal

“…21 Although lots of broadband NIR emissions in disordered crystals have been reported, few of them involve the 900 nm band. 22,23 Herein, a silica glass clad fiber containing a Nd 3+ /Yb 3+ :YCa 4 O(BO 3 ) 3 (abbreviated Nd 3+ /Yb 3+ :YCOB) disordered crystal core was drawn by the molten core method. The as-drawn precursor fiber core was found to be amorphous due to the precursor fiber was drawn at high temperature where fiber core was melted, whereas silica glass clad was softened.…”

“…These favorable traits can greatly improve pumping efficiency and generate ultrashort pulse lasers 21 . Although lots of broadband NIR emissions in disordered crystals have been reported, few of them involve the 900 nm band 22,23 …”

Highly efficient continuous-wave and mode-locking operation of a diode-pumped Nd:ASL disordered crystal laser

“…24) Sr 1−x Nd y La x−y Mg x Al 12−x O 19 (Nd:ASL) is a typical disordered crystal, in which Sr 2+ ions are partially substituted by La 3+ and Nd 3+ ions, and Al 3+ ions are partially substituted by Mg 2+ ions in SrAl 12 O 19 . 25) Among these ions, Mg 2+ and Al 3+ exhibit similar ionic radii (r Mg2+ = 66 pm, r Al3+ = 54 pm), the charge imbalance between Mg 2+ and Al 3+ causes the disordered structure of the crystal and leads to an inhomogeneous broadening of the absorption and emission spectra of the Nd:ASL crystal. In addition, the Nd:ASL single crystal features its quite high Nd 3+ doping concentration, because it possess a low concentration quenching rate and Nd:ASL crystal could allow 5 at% doping concentration compared to other Nd 3+ doped crystals whose doping concentration is usually less than 1%.…”