The phase matching and effective nonlinear coefficients in three planes of BaGa4Se7 (BGSe) crystal are simulated, and the optimal design of phase matching planes and matching types is given. At the same time, the cavity length and pump intensity threshold of the OPO are analysed, and the partial optimization design of the OPO is given. The experimental platform of optical parametric oscillator is designed and built. The idle pulse energy of 2980 nm is 0.806 mJ, 4132 nm is 0.263 mJ, and 6118 nm is 0.084 mJ. The corresponding optical-optical conversion efficiencies are 7.8%, 2.5% and 1%, and the slope efficiencies are 9%, 2.8% and 1.4%, respectively.
We describe the design and experimental result of a LD pumped Nd:YAG laser with 12J energy at repetition rate of 10Hz. The temperature distribution was controlled to less than 2℃ on the surface by means of uniform pump and cooling. The ASE was calculated by energy storage code and fit well with the measurement results which was about 1.72 in average. The beam quality was controlled by means of mechanical design and adjustment and compensation by a home-made deforming mirror. The far field was measured to 3.23 TDL. The stability of energy and pointing were paid great attention and control by means of full absorption and high stability mechanical design. The energy stability was less than1%(RMS) and pointing stability was 73μrad(PtV), which made the laser very comfortable for use.
A theoretical model for the effect of optical path difference on coherent polarization beam combination of ultrashort laser pulses is established, and the effects of optical path difference and spectral width on coherent polarization beam combination efficiency of ultrashort laser pulses are studied. The corresponding control index is put forward, and this research has certain guiding significance for the design of coherent polarization beam combination system of ultrashort laser pulses.
KEYWORDS: Energy efficiency, Energy conversion efficiency, Seaborgium, Precision calibration, Analytical research, Frequency conversion, Crystals, Laser crystals, High power lasers, Solid state lasers
Advanced an online low 1ω drive irradiance tuning technique of frequency conversion crystals of high power solid-state laser facility, which can acquire the best match angle of frequency conversion crystals through online low 1ω drive irradiance tuning curve test, and achieve fast and high precision angle correction to assure the frequency conversion crystals to achieve the highest energy conversion efficiency in shot experiments. Analyzed the possibility of online low 1ω drive irradiance tuning technique of frequency conversion crystals, researched the technical scheme of online low 1ω drive irradiance tuning of frequency conversion crystals, and applied this technique on SG facility, which achieved 60%~70% frequency conversion efficiency in high energy shots.
KEYWORDS: Crystals, Frequency conversion, Seaborgium, Laser crystals, Energy efficiency, Energy conversion efficiency, Target detection, High power lasers, Collimation, Signal processing
To assure that the frequency conversion crystals of SG facility are always being in the
best shot position, and have the highest energy conversion efficiency with various beam conducting
directions, we researched the precise tuning technique of frequency conversion crystals with the SG
facility. The on-line quick tuning method of target point detecting with preshot was used in precise
tuning of crystal match angle, and helped to correct the off-line match angle satisfactorily. With
crystal alignment technique and crystal accompany technique, the precise tuning of crystal match
angle can assure the crystals to maintain a stable high efficiency in a long experiment period.
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