Compensation method for temperature-induced phase mismatch during frequency conversion in high-power laser systems

Cui, Zijian; Liu, Dean; Sun, Meizhi; Miao, Jie; Zhu, Jianqiang

doi:10.1364/josab.33.000525

Cited by 23 publications

(7 citation statements)

References 30 publications

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“…All samples were cut to the dimensions of 10 mm × 10 mm × 1.5 (thickness) mm and underwent double-sided polishing, as shown in the inset of Figure 2a. As shown in Figure 2b [5,6], large-scale KDP and DKDP crystals are placed in ICF systems, particularly II-type and I-type oriented samples, to be used as frequency conversion devices. In the present experiment, nonlinear absorption properties were explored by the Z-scan technique.…”

Section: Methodsmentioning

confidence: 99%

“…KH 2 PO 4 (KDP) and KD 2−x H x PO 4 (DKDP) crystals, a kind of nonlinear optical material, find wide application as optical-electric conversion devices and multiple frequency converters [1][2][3][4]. They have wide applications in high-power laser systems, especially the Inertial Confinement Fusion system (ICF) [5,6]. However, laser-induced damage, which results from the interaction of laser pulses with KDP or DKDP crystals, may be produced, which then decreases laser conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Research on Nonlinear Absorption Effect in KDP and 70%-DKDP Crystals

Wang

et al. 2017

Crystals

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Nonlinear optical absorption effect in KDP and 70%-DKDP crystals, which were grown by the conventional temperature cooling method, was systematically studied using picosecond pulse laser excitation. Using open aperture Z-scan measurements, the dependence of nonlinear absorption effect on sample orientations (I, II, and z) as well as laser intensity was systematically measured at λ = 1064 and 532 nm. According to the experimental results, the nonlinear absorption effect at λ = 532 nm was confirmed, while at λ = 1064 nm no nonlinear absorption was observed for KDP and 70%-DKDP crystals. In addition, the optical absorption along I-and II-type affected by laser intensity was larger than that along the z-direction. The important nonlinear absorption coefficients β and χ (3) I (esu) measured along different orientations were exhibited in detail at wavelengths of 1064 nm and 532 nm. The results indicate that nonlinear absorption coefficients increase first and then decrease with the increment of laser intensity for KDP and 70%-DKDP crystals.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Nonlinear Absorption Effect in KDP and 70%-DKDP Crystals

Wang

et al. 2017

Crystals

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“…Therefore, the type-I SHG process can be described by the following Eqs. ( 6)-( 7) on the slowly varying envelope of plane waves [49,50,51].…”

Section: Optical Design Of the Polychromatic Light Generationmentioning

confidence: 99%

“…In order to obtain the third-harmonic light efficiently, the efficiency of the SHG should be around 66.7%, so that the fraction of the fundamental photon numbers and the second harmonic photon numbers is 1:1, and therefore the corresponding energy ratio is 1:2 according to Ref. [51]. Under our design scheme, 20-mm-and 15-mm-thick DKDP crystals are used for the SHG and third-harmonic generation (THG) of 1047nm laser, respectively, as indicated in Figs.…”

Section: Optical Design Of the Polychromatic Light Generationmentioning

confidence: 99%

Polychromatic drivers for inertial fusion energy

Zhao,

Sheng,

Cui

et al. 2021

Preprint

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Although tremendous achievements have been made toward inertial confinement fusion, laser plasma instabilities (LPIs) remain to be the inevitable problem for current drive schemes. To mitigate these instabilities, here we propose the design of polychromatic drivers for the generation of multicolor beams based upon optical parametric amplification and frequency conversion technologies. Each polychromatic light has four colors of monochromatic beamlets with a full spectrum width of 3%, and the beamlet colors of any two adjacent flanges are different. The suppression effects of such polychromatic lights have been investigated via particle-incell simulations, which indicate that more than 35% of the incident energies can be saved from the LPIs compared with monochromatic lasers for the direct drive scheme, or high-density filled target for the indirect drive scheme. The proposed polychromatic drivers are based on the matured technologies, and thus may pave the way towards realization of stable and high-efficiency fusion ignition.

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“…DKDP crystals are used as nonlinear and electro-optic crystals in the OPA system. The electro-optic effect can change the refractive index to compensate for the phase mismatch caused by temperature change or mechanical deformation [14]. In this study, a 1064 nm OPA system is adopted to verify the feasibility of this method.…”

Section: Introductionmentioning

confidence: 99%

Phase Compensation Method in OPA System Based on the Linear Electro-Optic Effect

Yang

Liu

2021

Photonics

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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.

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Compensation method for temperature-induced phase mismatch during frequency conversion in high-power laser systems

Cited by 23 publications

References 30 publications

Research on Nonlinear Absorption Effect in KDP and 70%-DKDP Crystals

Research on Nonlinear Absorption Effect in KDP and 70%-DKDP Crystals

Polychromatic drivers for inertial fusion energy

Phase Compensation Method in OPA System Based on the Linear Electro-Optic Effect

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