Thin-film thickness-modulated designs for optical minus filter

Zhang, Jinlong; Xie, Yanhui; Cheng, Xinbin; Jiao, Hongfei; Wang, Zhanshan

doi:10.1364/ao.52.005788

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…Dielectric mirrors provide flexibility to the optical designer to fix the light source intensity at any desired level as the overall output light intensity can be compensated by using a mirror of higher reflectance. For applications requiring very narrow reflection peaks, dielectric mirrors with thickness and refractive index modulation have been proposed by various researchers in recent times 13,14 . With the advancement of coating processes and related characterization techniques, design and fabrication of improved, high efficiency thin film filters will remain a key area in times to come.…”

Section: Resultsmentioning

confidence: 99%

Multi-layer dielectric thin-film optical filters for beam folding applications

et al. 2015

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Multi-layer reflective thin film filters optimized for oblique incidence angles were deposited on glass substrates using Electron Beam evaporation technique with in situ thickness monitoring. The present study involves deposition and optical characterization of 5 layered multi-layer structures of TiO 2 -Al 2 O 3 and TiO 2 -SiO 2 having different thicknesses for varied wavelength ranges in the visible region. Three TiO 2 -SiO 2 multi-layer thin film filters were deposited having peak reflectance at 480 nm, 540 nm and 675 nm respectively corresponding to light sources in the blue, green and red wavelength regions. Similarly, a TiO 2 -Al 2 O 3 multi-layer was fabricated having peak reflectance of around 64% at 610nm. These filters were deposited at an elevated temperature of 250° C in an oxygenated reactive environment for better adhesion, mechanical strength and proper stoichiometry. Reflectance measurements of these multi-layer filters at oblique incidence angles reveal high reflectance of around 70 ~ 75% with a reasonably broad reflection band which can have wide applications in beam steering, shaping and folding applications in various complex optical systems facing constrained space and weight requirements.

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Section: Resultsmentioning

confidence: 99%

Multi-layer dielectric thin-film optical filters for beam folding applications

et al. 2015

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“…The laser power distribution and the temperature distribution are calculated at various incident cone angles. In the analysis, the optical parameters and the calorific parameters of the materials are shown in table 1 [10][11] . According to formula (1)-(4), the spectral transmissivities of the narrowband filter at various cone angles are figure out, which is shown in Fig.…”

Section: Calculations and Resultsmentioning

confidence: 99%

Theoretical study of laser induced thermal damage on the narrowband filter optical thin film

Han¹

2015

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering

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Abstract. In the experimental study of the film's thermal damage, an extremely high power density is needed. In order to achieve such high power density, the incident beam is generally converted. In this situation, the cone's angle of the converted beam is inevitable. A narrowband filter optical film is taken as an example. The influence of the beam cone angle on the thermal damage of the optical film is theoretically studied. Under the irradiation of high energy laser, the film absorbs the laser energy and the heat is accumulated continuously in the film. The cone's angle influences the laser intensity distribution, i.e. the heat source, in the multilayer film. The temperature distribution and the temperature rising process are also related to the cone's angle. Only if the cone's half angle is smaller than 3°, the influence of the cone's angle can be ignored.

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“…The average transmittance is higher than 98% in the pass spectral region, and the reflectance is higher than 99% in the wavelength region of 720-1150 nm. The main structure of the final design can be interpreted as two short-wave-pass eighth-wave/quarter-wave/eighth-wave stacks with the central rejection wavelength of about 830 and the substrate and the stack as a broadband antireflection (AR) coating to reduce oscillations in the passband [18]. The obtained design has no thin layers and is suitable for accurate monitoring during the deposition (Fig.…”

Section: Advantages Of Indirect Monitoring: Preventing the Accumulatimentioning

confidence: 99%

Advantages and challenges of optical coating production with indirect monochromatic monitoring

et al. 2015

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In this paper, we present our recent studies on raising the quality of optical coating production with an indirect monochromatic monitoring system. Preproduction error analysis and computational manufacturing are used to estimate potential advantages of application of indirect optical monitoring. It is then demonstrated that a key issue for realization of this advantage is accurate specification of tooling factors for layer thicknesses on test glasses. The tooling factors are precalibrated using single layer depositions and then are corrected using results of reverse engineering for the first production run. It is found that a gradual variation of tooling factors of low index layers is the main error factor in the first deposition run. Finally, we redeposit our coating with a modified monitoring strategy, taking into account this factor. The new experimental results show excellent correspondence with the theoretical spectral performance.

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Thin-film thickness-modulated designs for optical minus filter

Cited by 29 publications

References 16 publications

Multi-layer dielectric thin-film optical filters for beam folding applications

Multi-layer dielectric thin-film optical filters for beam folding applications

Theoretical study of laser induced thermal damage on the narrowband filter optical thin film

Advantages and challenges of optical coating production with indirect monochromatic monitoring

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