Abstract
Factors such as mechanical deformation and temperature changes lead to phase mismatch in optical parametric amplification systems, impacting energy stability. A phase compensation method via the linear electro-optic effect can overcome this limitation. Phase mismatch compensation characteristics were simulated via the linear electro-optic effect in 70%-deuterated DKDP and 95%-deuterated DKDP. This method was applied to OPA systems to verify its feasibility. The results show that the temperature acceptance bandwidth of 70%-deuterated DKDP and 95%-deuterated DKDP can be ~1.75 and ~2 times larger, respectively, than that of the OPA without compensation. Moreover, the angle acceptance bandwidth of 70%-deuterated DKDP and 95%-deuterated DKDP can be ~2 times larger than that of the OPA without compensation. The abovementioned method can facilitate the compensation of phase mismatch within a range and can be widely used in OPA and optical parametric chirped pulse amplification systems to improve laser stability.
Highlights
Since the optical parametric chirped pulse amplification (OPCPA) technology has been proposed [1], further developments have been achieved in the field of high-power lasers
A method for phase mismatch compensation capable of improving the stability of optical parametric amplification (OPA) laser systems was described in this study
This method can accurately compensate for the phase mismatch caused by factors such as temperature changes and mechanical deformation
Summary
Since the optical parametric chirped pulse amplification (OPCPA) technology has been proposed [1], further developments have been achieved in the field of high-power lasers. LBO, YCOB, KDP, and DKDP nonlinear crystals are the best candidates for OPCPA systems [9,10,11]. Despite the fact that KDP and DKDP crystals display weak nonlinearity, they are the only crystals that can be grown to an aperture of 300 mm or more [12] They are promising nonlinear crystals used in main amplifiers in OPCPA laser systems. For an optical parametric amplifier pumped at 527 nm, KDP and DKDP crystals can achieve wide gain bandwidths at a wavelength of 910 nm. In some high-repetition ultra-intense laser systems, the temperature of DKDP crystals gradually rises, resulting in phase mismatch. The electro-optic effect can change the refractive index to compensate for the phase mismatch caused by temperature change or mechanical deformation [14]. This method has universal applicability in OPA systems at different wavelengths, and it can be used to improve the stability of OPCPA systems
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