Gain anticipation of Ho3+ in ion-exchangeable germanate waveguide glasses

Efficient infrared emissions at similar to 1.2 and similar to 2.0 mu m were recorded in Ho3+-single-doped and Ho3+/Yb3+-co-doped aluminum germanate glasses (NMAG), respectively. The maximum stimulated emission cross-sections for the similar to 1.2- and similar to 2.0 mu m emissions were derived to be 2.3x10(-21) and 5.8x10(-21)cm(2), respectively; then the gain cross-sections were further evaluated and the effective gains have been anticipated. In addition, the channel waveguide fabricated by K+-Na+ ion-exchanged method exhibited a complete single mode at 1.55 mu m and the field diameters were identified to be horizontally 10.6 mu m and vertically 6.7 mu m. Effective amplified spontaneous emission at similar to 2.0 mu m was recorded under 980nm laser pumping. Broad bandwidth, large emission cross-section and perfect thermal ion-exchangeability indicate that Ho3+- and Yb3+-doped NMAG glasses are promising for the development of optical amplifier, tunable laser and light source operating at similar to 1.2 and similar to 2.0 mu m. [GRAPHICS] .