Diode-pumped passively Q-switched Nd:YAG ceramic laser at 1319 nm with Co2+:LaMgAl11O19 crystal as the saturable absorber

Gold nano-triangles as saturable absorbers for a dual-wavelength passively Q-switched Nd:GYSGG laser

“…As can be seen, the pulse trains seem relatively stable under low pump power. Once the pump power is increased, the pulse trains become unstable with amplitude jitters which are common in passively Q-switched lasers [10,13,14]. The reason for the unstable pulse trains could be the oversaturation of the SA at high-incident intensity [12].…”

Gold nanorods as a saturable absorber for passively Q-switching Nd:YAG lasers at 1064.3 and 1112 nm

“…The repetition rates varied from 150 to 300 kHz with the pump power increasing from 5.7 to 8.09 W. The pulse width presented a rapid drop from 573 ns to 245 ns with the pump power increased from threshold power to 6.77 W as depicted in figure 3. When the pump power became higher than 6.77 W, the pulse width changed slowly due to the population inversion density of the gain medium depleted at a very short time and the pulse width was saturated [4].The shortest pulse width of 223 ns with 300 kHz repetition rates was obtained, corre sponding to pulse energy of 337.7 nJ. The 223 ns pulse width was shorter than the previous results obtained in the diode-side pumped GNRs Q-switched Nd:YAG laser [28].…”

“…Near-infrared lasers with nanosecond pulse duration have wide-ranging applications in nonlinear optical conversion, military and precision laser machining [1][2][3]. Passive Q-switching technology is a suitable method for generating nanosecond pulses [4,5]. For this kind of laser, the laser performances are dependent on the properties of the saturable absorber (SA), which modulates the intracavity loss periodically.…”

Passively Q-switched performance of a Nd:Gd3Ga5O12 eye-safe laser at 14234 nm with Co2+:LaMgAl11O19 as saturable absorber

“…So far, only V-doped yttrium aluminum garnet crystals have been employed as saturable absorbers for Q-switched lasers operating above 1.4 μm. Because the absorption spectrum of Co:LMA is arranged from 1100 to 1600 nm [17][18][19][20], additionally, owing to the excellent physical and optical performance at the wavelength of 1444 nm [16,18], Co:LMA is regarded as a potential saturable absorber for Q-switching lasers operating around 1.4 μm. However, the characteristics of the Co 2 :LaMgAl 11 O 19 used as the saturable absorber for a 1.4 μm laser have not been studied before.…”