Room-temperature cascaded mid-infrared (MIR) pulsed laser output in Er:YAG crystal is reported. The 1469nm characteristic wavelength of the cascade emission is observed. The characteristic wavelength of the excited-state absorption (ESA) is determined as 1676nm. An Er:YAG crystal with concentration of 10at.% is adopted to compare the laser output energy in the cascaded and non-cascaded configuration. The maximum single pulse energy of MIR laser increases from 1.04mJ (non-cascade) to 1.51mJ (cascade), corresponding to a ratio of 45.2%. The “cyclic cascade” is considered to be the mechanism responsible for the laser performance optimization. The experimental results confirm the existance of cascade at room temperature in Er:YAG crystal. Moreover, cascade is helpful to improve the single pulse energy of MIR laser.
We present a novel structure of planar waveguide for Yb:YAG laser amplifiers allowing large absorption length. The structure parameters of the planar waveguide were optimized using an 3D amplification model. The performance of the optimized planar waveguide laser amplifier was simulated, and a comparison between the cases with and without considering pump saturation was carried out. The simulated results show that a high pump absorption efficiency and optical-to-optical efficiency can be expected in addition to a good absorption uniformity. The seeder power is scaled from 200W to 7000W, the corresponding pump absorption and optical-to-optical efficiencies are 98.6% and 68%, respectively. The thermal stress of the designed planar waveguide is analyzed theoretically, the results show that the pump power of 10kW is available without the fracture risk.
Room-temperature cascaded mid-infrared (MIR) pulsed laser output in Er:YAG crystal is reported. The 1469nm characteristic wavelength of the cascade emission is observed. The characteristic wavelength of the excited-state absorption (ESA) is determined as 1676nm. An Er:YAG crystal with concentration of 10at.% is adopted to compare the laser output energy in the cascaded and non-cascaded configuration. The maximum single pulse energy of MIR laser increases from 1.04mJ (non-cascade) to 1.51mJ (cascade), corresponding to a ratio of 45.2%. The “cyclic cascade” is considered to be the mechanism responsible for the laser performance optimization. The experimental results confirm the existance of cascade at room temperature in Er:YAG crystal. Moreover, cascade is helpful to improve the single pulse energy of MIR laser.
We present a novel structure of planar waveguide for Yb:YAG laser amplifiers allowing large absorption length. The structure parameters of the planar waveguide were optimized using an 3D amplification model. The performance of the optimized planar waveguide laser amplifier was simulated, and a comparison between the cases with and without considering pump saturation was carried out. The simulated results show that a high pump absorption efficiency and optical-to-optical efficiency can be expected in addition to a good absorption uniformity. The seeder power is scaled from 200W to 7000W, the corresponding pump absorption and optical-to-optical efficiencies are 98.6% and 68%, respectively. The thermal stress of the designed planar waveguide was analyzed theoretically, showing that the pump power of 10kW is available according to the stress fracture limit.
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