An experimental setup of mid-infrared Fe:ZnSe laser operating at room temperature has been established, which was end-pumped by a non-chain pulsed HF laser. The temperature has significant influence on the level lifetime of Fe:ZnSe laser. As the crystal temperature changes from 85 to 295 K, the level lifetime of Fe ions changes from 57 to 0.35 μs, it is important for matching the pump pulse width and the level lifetime. Electronic excitation HF laser with short pulsed width is a good pump source for Fe2+:ZnSe laser at room temperature. For the Fe2+:ZnSe crystal with size of 20×20mm, when the pumping spot diameters is lower than 9.2mm, the phenomenon of transversal parasitic oscillation could been suppressed effectively. At room temperature, the output energy of Fe2+:ZnSe reaches 294mJ, the slope efficiency is about 36%, and the optical to optical efficiency respecting to the pump energy is 34%.
Crystal thermal characteristic is a key factor to affect output laser property. In some applications, the facets of crystal will be contaminated by dust in the air, which will enhance the heat absorption of laser and cause local thermal unbalance. Therefore a novel crystal heat dissipation method is proposed in this paper. Crystal is mounted in a specially designed heat sink, heat conducts between the contacting surfaces of crystal and heat sink. Pump incident laser irradiates from the end facet of crystal. The end facet of crystal is cooling by convection heat transfer with flowing protect gas. The experiment device is established, the pump laser is Hydrogen Fluoride laser with the wavelength of 2.8μm, pulse energy of 600mJ, and repetition rate of 50Hz. The crystal is Fe: ZnSe with the dimension of 20mm× 20mm× 6mm. The beam quality is measured in the condition with and without heat sink for comparison, the results indicate that the heat dissipation method proposed in this paper is benefit for improving the beam quality.
High power TEA CO2 laser belongs to the gas laser with high-voltage (HV) pulse excitation. The strong electromagnetic interference (EMI) are generated mainly from the discharge circuit loop, the pulse spark switch and the HV supply when the laser works. It has a strong interference and destructive effect on the electronic equipments inside and outside the laser system. The mechanism analysis and experimental measurement were carried out in this paper. The shielding design on the HV supply, the main discharge circuit loop and the main control unit restrained the transmission of EMI effectively. The mains filters were designed to restrain the conducing EMI propagation path. As a sensitive device to EMI, the control system was shielded, isolated and mains filtered on hardware, anti-interference on software was designed to improve the ability of noise reduction. Experimental results demonstrated that reducing EMI intensity, shielding EMI, improving the hardware ability on noise suppression are the primary methods to retrain EMI and keep the hardware of laser control system from being destroyed, the anti-interference on software is a support and complement of hardware noise suppression, which improves the reliability of the laser system.
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