Optimization of near-field optical field of multi-layer dielectric gratings for pulse compressor

Liu, Shijie; Shen, Zicai; Kong, Weijing; Shen, Jing; Deng, Zhenxia; Zhao, Yuanan; Shao, Jianda; Zhang, Fan

doi:10.1016/j.optcom.2006.06.022

Cited by 35 publications

(22 citation statements)

References 13 publications

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“…With the advances in the technologies of microphotolithography, the feature size of a blazed grating can be manufactured in the subwavelength region, in which rigorous vector theories such as the Fourier modal method (FMM) [3][4][5], rigorous-coupled wave analysis (RCWA) [6], the true modal method (TMM), the coordinate transformation method (C-method), and the finite-difference time-domain (FDTD) method [7] must be used to calculate the diffraction efficiency of a grating. However, these rigorous vector diffraction methods are difficult to use because they are computationally intensive.…”

Section: Introductionmentioning

confidence: 99%

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

et al. 2014

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The accuracy of scalar diffraction theory (SDT) and effective medium theory (EMT) for analyzing a blazed grating is quantitatively demonstrated by making a comparison of diffraction efficiencies calculated by the two simplified methods to exact results from the Fourier modal method (FMM). It is found that when the normalized period is more than fivefold wavelength of incident light at normal incidence and is more than about tenfold wavelength at larger incident angle, SDT can be used to easily analyze effectively the transmittance characteristics of a blazed grating with divergence less than 1%. Particularly, for zeroth-order diffraction when the groove depth is less than threefold wavelength, the transmittance calculated by SDT with refractive index of 1.5 and normalized period of 5.0 agrees well with that of FMM at normal incidence. But, for ±1 orders, the validity of SDT is degraded from that for zeroth order. Generally, the deviation of transmittances between the SDT and the FMM increases as the incident angle and refractive index augment. Furthermore, when higher diffraction orders other than zeroth order are not propagating, the EMT is valid to evaluate the transmittance of a blazed grating at normal incidence. Similarly, the error of transmittances between the EMT and the FMM increases with the increase of incident angle and refractive index. The effectiveness of the SDT and the EMT for analyzing a blazed grating in the range of the normalized period far more than and less than the wavelength of incident light, respectively, is dependent on the parameters including incident angle, refractive index, normalized period, and normalized groove depth.

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Section: Introductionmentioning

confidence: 99%

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

et al. 2014

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“…MDGs can provide both good spectral performance and a high laser-induced damage threshold (LIDT) [1][2][3]. For several years, researchers have been focusing on the design, fabrication, and LIDT improvement of MDGs [4][5][6]. So far, the highest efficiency of about 99.577% for 1053 nm has been achieved in practice [7], and the full size of mosaic MDGs has been scaled up to 141 cm × 43 cm [8].…”

Section: Introductionmentioning

confidence: 99%

“…According to research into laserinduced damage characteristics of MDGs, internal electric field enhancement in the grating ridge is critical for laser damage resistance of MDGs in high-energy laser systems [10][11][12]. Researchers have devoted themselves to reducing internal electric fields for improving laser damage resistance of MDGs [4,6,11]. However, there are few studies on optical properties of damaged MDGs.…”

Section: Introductionmentioning

confidence: 99%

Influence of horizontal damage size of grating ridge on the optical properties of multilayer dielectric gratings

et al. 2014

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Based on typical laser damage morphologies of multilayer dielectric gratings (MDGs), in this paper the influence of horizontal damage size of the grating ridge on optical properties of MDGs is analyzed by numerical calculations using the rigorous coupled wave analysis method. From simulation results, the optical performance of MDGs decreases with the increase in horizontal damage size of the grating ridge. But the maximum electric field value in the grating ridge and the multilayer enhances constantly with the increase in horizontal damage size, thus inducing further laser damage of MDGs. This paper provides the preliminary study for functional damage of MDGs.

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“…To provide large output energy in a chirped-pulse amplification system, the pulse compression gratings should satisfy the requirements of high diffraction efficiency [3][4][5][6], high laser-induced damage threshold [7][8][9][10], and a broad diffraction band [11][12][13]. Multilayer dielectric gratings (MDGs) and metal multilayer dielectric gratings (MMDGs), which meet the above requirements, have widely replaced the traditional metal gratings in high-power laser systems.…”

Section: Introductionmentioning

confidence: 99%

High-spectral-resolution characterization of broadband high-efficiency reflection gratings

Wang

Hou

et al. 2013

Appl. Opt.

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An optical characterization method with high spectral resolution for broadband, multilayer dielectric gratings working at the -1st reflection order is demonstrated in this paper. The diffraction-efficiency measurement setup for the broadband gratings with high efficiencies mainly consists of a double-light-path system with a monochromator as the illumination source and an automatic rotation stage for incident and diffraction angles adjustment. Two typical practical difficulties, namely (1) the mismatch between the spot size of diffracted light and the limited detector aperture and (2) the shared propagation path between the incident and diffracted light at the Littrow angle, were well solved. A fabricated multilayer dielectric grating was measured on the established measurement setup. Diffraction efficiencies greater than 90% in the wavelength range from 763 to 852 nm were obtained with an average relative deviation less than 1.0%. At the moment, the wavelength resolution is 1 nm and the angle resolution is 0.2 deg. The high-resolution broadband diffraction spectrometry testing method is applicable to characterizing broadband pulse compression gratings in the laser systems.

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Optimization of near-field optical field of multi-layer dielectric gratings for pulse compressor

Cited by 35 publications

References 13 publications

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

Influence of horizontal damage size of grating ridge on the optical properties of multilayer dielectric gratings

High-spectral-resolution characterization of broadband high-efficiency reflection gratings

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