PassiveQ-switching of a diode-pumped 1520 nm Er:Yb:YAl₃(BO₃)₄micro-laser with a Co²⁺:Mg_0.4Al_2.4O₄saturable absorber

Abstract

Using an Er:Yb:YAl3(BO3)4 crystal as the gain medium and a Co2+:Mg0.4Al2.4O4 spinel crystal as the saturable absorber, an efficient passively Q-switched 1520 nm pulse laser was realized in a plano–plano cavity end-pumped by a 970 nm diode laser. At an absorbed pump power of 14.8 W and output mirror transmission of 4.6%, a 1520 nm pulse laser with 11.1 μJ energy, 16 ns duration and 27 kHz repetition rate was obtained, which resulted in about 0.7 kW output peak power. Furthermore, the influence of the output mirror transmission on the pulse energy, duration and repetition rate was also investigated.

Structural and Optical Properties of Co2+-Doped PbSe Nanocrystals in Chalcogeneide Glass Matrix

“…The observed structures in the optical absorption spectra of PbSe:Co 2+ system, analyzed in this study, are similar to those observed in other materials, both in bulk as well as in the nanocrystalline form, ,− ,,,, when the Co 2+ ion is in the tetrahedral site, and are not consistent with the optical properties of the Co 2+ ion when it is in the octahedral sites. , The crystal field strength Δ for the tetrahedral site is lower than the charged ion in the octrahedral site (Δ ( Td ) ≈ 0.5 Δ ( Oh ) ). , This leads to a big change in the optical transitions’ energy observed in the optical absorption spectra …”

“…In this context, the melting-nucleation approach appears as an appropriate synthesis technique since it allows the growth of DMS NCs embedded in different glass matrices, which can avoid undesirable effects on the nanostructures, such as corrosion and humidity. − An interesting case is the Co 2+ ion. As this ion is introduced into the tetraedral site, it shows a characteristic d–d absorption/emission in the visible and near-infrared spectral range that can be used in a broad range of applications as blue pigments (Al 2 O 4 :Co 2+ ), optoelectronics and spintronics (ZnO:Co 2+ ), , phosphors (ZnAl 2 O 4 :Co 2+ ), , Q -switch and nonlinear optics, − and infrared lasers (MgAl 2 O 4 :Co 2+ ) ,− materials.…”

Er 3+ ,Yb 3+ :glass-Co 2+ :MgAl 2 O 4 diffusion bonded passively Q-switched laser

“…These features make the eye-safe laser an important light source in a wide range of applications, such as in medicine, range-finding, atmospheric sensing, and optical communication. [1][2][3][4][5][6][7][8] Compared with Raman lasers [9] and optical parametric oscillators (OPOs) [10] pumped by high peak power Nd lasers, the laserdiode-pumped Er 3+ ,Yb 3+ :glass-Co 2+ :MgAl 2 O 4 passively Qswitched lasers have aroused a great deal of interest due to their compactness, low cost and high reliability. In 2000, Gunnar Karlsson demonstrated a miniature Er:Yb:glass laser that was Q-switched by a Co 2+ :MgAl 2 O 4 (Co 2+ :spinel) saturable absorber for the first time.…”

Eye-safe 155 μm passively Q-switched Er,Yb:GdAl_3(BO_3)_4 diode-pumped laser

“…Er,Yb-codoped oxoborate crystals possess good spectro scopic characteristics and appropriate thermomechanical prop erties for efficient laser operation [8]. A passively Q-switched regime of operation was demonstrated by the usage of Er, УЬ:СаСа40 ( Б 0 з ) з [9], Er, УЬ:УА1з (БО з ) 4 (YAB) [10,11], Er, yb:LuA13(B 0 3) 4 (LuAB) [12], and Er, yb:Sr3Lu2 (B 0 3) 4 [13] crystals. A pulse energy of 5.25 pJ at a repetition rate of 60 kHz corresponding to an average output power of 315 m W was realized for Er, УЬ:УА13 ( Б 0 3) 4 crystal [10].…”