Solid-state lasers are widely used in many applications. The LD pumping module is the power source of the laser system. A well-designed pumping light field can achieve high efficiency and high quality laser output. In this paper, a mathematic model of the side-pumping module is constructed. The light field of a single LD bar is tested and simulated with different parameters with the ray tracing method. Then the pump power distribution in the cross section of the LD array is analyzed, which indicates the absorption and distribution in the laser rod. An improved method by increasing the pumping sides is proposed to achieve higher pumping homogeneity. Simulation results show that the pumping homogeneity is improved. A pumping module is produced according to the design. After a small adjustment of the mathematic model, the test result of the rod cross section photos fits the simulation well. Then an optical resonant cavity with a Nd: YAG laser rod is set up. The laser with the beam quality near the diffraction limit is obtained. The LD pumping module can be used in high power MOPA laser systems. The improved mathematic model can be used to simulate and design side-pumped lasers in future.
Laser decoy is widely used in the field of electro-optical countermeasures, against laser guided semi-automatic weapons. Decoy laser usually includes a laser light source with specific wavelength and signal, whose energy distribution has Lambertian reflection characteristics. With a 633nm laser source, a fibre and a diffusive module, a homogeneous field laser was illustrated, which was generated through high-density colloidal dispersion to get diffused. By optimizing the fibre and structure parameters, the laser light energy utilization was improved while maintain light field uniformity. Additionally, the flat field system was designed and tested using high reflectivity PTFE material, with a reflectivity of 97%. A developed Lambertian light source system for reference-based Laser decoy was established, whose non-uniformity was lower than 0.3%. The results showed that the Lambertian light source system could meet the requirement of Laser decoy, and needed to be improved in near infrared.
Side diode pumped electro-optical Q Switching Nd: YAG is demonstrated as master oscillator. F-P etalon and twisted-mode cavity combined configuration is introduced to select longitudinal modes. The seed light experiences a round trip through the two flash pump amplifiers, in this device, the 4f image transmission system and SBS phase conjugate mirror is adopted in order to improved beam quality, by compensating the heat depolarization effect and eliminate wave-front distortion. In the condition of 1 or 5 repetitions of the wavelength at 1064nm, it produces the pulse energy of 300mJ, pulse width of 12ns, and energy instability (RMS) below 3% in single longitudinal mode operation. With a type two-phase matched KTP crystal, 532nm green light is yielded, at 1 Hz repetition rate, the pulse energy of green light is more than 150mJ.
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