Co^2+:YSGG saturable absorber Q switch for infrared erbium lasers

Abstract

Passive Q switching of Er:glass (1.53 microm) with a new, robust, solid-state saturable absorber, Co(2+):Y(3)Sc(2)Ga(3)O(12), has been demonstrated. Q-switched pulses of 20 ns and 4 mJ of energy were obtained. An absorption cross section of 5 x 10(-20) cm(2) was measured. Preliminary results for a Co(2+):Y(3)Al(5)O(12) saturable absorber Q switch are also discussed.

Development of Saturable Absorbers for Laser Passive Q‐Switching near 1.5 μm Based on Transparent Ceramic Co2+:MgAl2O4

“…3 Many types of passive switching materials have been developed, the most popular being based on the transition-metal cations like Cr 4+ , V 3+ , or Co 2+ as the active dopant. [4][5][6][7] For some important infrared lasers in the 1. [7][8][9][10][11][12][13][14][15][16][17] Until recently, only doped single-crystals or glass-ceramic (low scale)-based saturable absorbers were practically employed.…”

Doping-induced emission of infrared light from Co2+-doped ZnSe quantum dots

“…(0.74 Å ), which makes it easier to incorporate into the lattice of ZnSe. As promising fluorescence host materials, the major advantage of Co-doped ZnSe crystals is their much higher absorption cross sections, which can lead to a much lower saturation fluence thereby reducing vulnerability to damage [9]. The luminescence properties of visible light-emitting ZnSe QDs have been studied by doping with Mn 2?…”

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

“…They are distinguished primarily by short relaxation times of the bleached state (<10 nsec) and comparatively low σ a values in the region 1.5 μm (<10 -19 cm 2 , Table 3). Gain modulation of a glass Er glass laser was demonstrated using PS based on Co 2+ :Y 3 Sc 2 Ga 3 O 12 and Co 2+ :Y 3 Al 5 O 12 [24]. The best result was achieved with Co 2+ : Y 3 Sc 2 Ga 3 O 12 crystal.…”

“…The best result was achieved with Co 2+ : Y 3 Sc 2 Ga 3 O 12 crystal. The pulse duration was 20 nsec; energy, 4 mJ [24]. However, radiation focusing in the PS using a 5-cm lens was used for this in the 23.5-cm cavity.…”