Diode-pumped Inorganic Liquid Laser System Performance Studies

The research of high-energy laser system is international advanced domain, which means not only high output energy but also high output power. It's usually thought the high-energy laser's average output power is more than 10 kW, last time is more than several seconds and the energy is more than several thousands joule. The high-energy laser is diffusely used and the applied scope will enlarge with the laser performance improving. The typical high energy lasers contain CO₂ laser,HF laser,DF laser,COIL and DPSSL presently.CO₂ laser is strongly absorbed by atmosphere, its effective distance is limited; chemical lasers are too much complicated: they have many accessorial equipments and the manufacture expenditure is expensive, so they are difficult to achieve high reliability and miniaturization; DPSSL exists serious thermal cumulate, so it is difficult to achieve high repeat frequency and high beam quality.The Nd³⁺ inorganic liquid laser with DL pumped has obvious excellence: it can use pumping energy adequately and solve thermal cumulate to gain high beam quality output. So it is the direction of new high-energy laser system.According to laser principle, this thesis simulated the characteristic of inorganic liquid laser system, such as:1. Introduced the technology of inorganic liquid laser and latest research evolvement.2. Simulated the energy conversion efficiency and the function of system parameters.3. Simulated the thermal characteristic, wave-front compensate and laser far facular.4. Compared the thermal characteristic and beam quality of single gain system and double gain system.5. Started the static liquid laser experiment with single DL side-pumping, measured the absorb spectrum, little signal gain coefficient and output parameters, compared to academic simulation results.According to academic simulation and experiment measure, we can get several conclusions as follows:1. This liquid laser system can achieve very high conversion efficiency; which is larger than 30% with continuous pumping.2. The far facular of double-gain-system with wave-front equalize is close to the far facular of ideals plane wave and the beam quality is obviously better than the single gain host system.3. The inorganic liquid laser system pumped with diode lasers can achieve high repeat frequency even continuous laser output.According to academic analyze and experiment results, we can forecast the laser system is able to achieve high average power, high beam quality and high repeat frequency laser output, so it is very important in high-energy laser system.