Passive Q-switching laser performance of Yb:Gd3Ga5O12 garnet crystal

• Wenjuan Han, Qibiao Dai, Tian Xueping, Kui Wu, Huaijin Zhang, Linhua Xia, and Junhai Liu
• received 03/25/2013; accepted 05/21/2013; posted 05/21/2013; Doc. ID 187725
• [full text: PDF (520) KB)]
• Abstract: We report on the passive Q-switching laser performance of the Yb:Gd3Ga5O12 garnet crystal. With a Cr4+:YAG crystal used as saturable absorber for passive Q-switching, an average output power of 5.31 W was produced at a pulse repetition rate of 62.5 kHz, the optical-to-optical and slope efficiencies being respectively 45% and 61%. Laser pulses of 140 J in energy and 5.8 ns in duration were also obtained at 22.2 kHz, with a corresponding peak power amounting to 24.1 kW.

Keywords (OCIS):

• (140.3480) Lasers and laser optics : Lasers, diode-pumped
• (140.3540) Lasers and laser optics : Lasers, Q-switched
• (140.3615) Lasers and laser optics : Lasers, ytterbium

Analysis of laser generated ultrasonic wave frequency characteristics induced by a partially closed surface breaking crack

• Jia Li, Hongchao Zhang, Chenyin Ni, and Zhonghua Shen
• received 03/20/2013; accepted 05/20/2013; posted 05/21/2013; Doc. ID 187438
• [full text: PDF (1562) KB)]
• Abstract: This research focuses on analyzing the frequency characteristics of ultrasonic waves induced by a partially closed surface breaking crack. When acoustic waves interact with the crack, transmission, reflection and mode conversions occur and the frequency characteristics of signals perform obvious changes. A pulsed laser line source is used to generate ultrasonic waves in the sample with a partially closed surface breaking crack, and one can see how the frequency characteristics of detected signals change as the pulsed laser beam scanning across the sample surface. The optical deflection beam method is developed to detect the crack experimentally. The Fast Fourier Transform (FFT) is used to analyze the time-domain data and the FFT data is visualized by a B-scan plot. A clear disruption in the B-scan can be observed when the laser beam illuminates directly onto the crack and which is due to the changes of frequency characteristics induced by the partially closed crack. A frequency- domain B-scan of numerical simulation result is presented and the clear disruption could also be observed clearly.

Keywords (OCIS):

• (040.1880) Detectors : Detection
• (280.3375) Remote sensing and sensors : Laser induced ultrasonics
• (070.7345) Fourier optics and signal processing : Wave propagation

Numerical study of novel high-index-contrast Er:LiNbO3 photonic wire lasers optically pumped at 980nm

• Md. Sohel Mahmud Sher, Paolo Pintus, and Fabrizio Di Pasquale
• received 01/11/2013; accepted 05/20/2013; posted 05/21/2013; Doc. ID 183323
• [full text: PDF (730) KB)]
• Abstract: For the first time a high-index-contrast z-cut Er:LiNbO3 photonic wire waveguide laser, optically pumped at 980nm wavelength, is designed for continuous wave operation. Waveguide modes and laser characteristics are numerically computed using a developed full vectorial finite element method based tool. In order to maximize the output power of the laser, the active cavity length and output mirror’s reflectivity have been optimized, considering different pump power and waveguide background losses. Efficient laser emission is theoretically predicted at 1531nm wavelength for the fundamental TE mode and a value of threshold pump power as low as 0.2mW has been computed.

Keywords (OCIS):

• (130.0130) Integrated optics : Integrated optics
• (130.1750) Integrated optics : Components
• (130.3730) Integrated optics : Lithium niobate

Stability analysis and comparison of demodulation methods for dual-beam wavelength-modulation spectroscopy water vapor detection

• Cunguang Zhu, Jun Chang, Pengpeng Wang, Weijie Wang, Qiang Wang, Yongning Liu, Guangping Lv, Xiangzhi Liu, Wei Wei, and Fupeng Wang
• received 02/05/2013; accepted 05/20/2013; posted 05/21/2013; Doc. ID 184867
• [full text: PDF (4210) KB)]
• Abstract: Subtraction, division and balanced ratiometric detection (BRD) are three important demodulation methods employed extensively for dual-beam wavelength modulation (WM) trace gas detection. However, the stability comparison among these methods under changed environmental factors was rarely researched. In this paper, influences of ambient temperature and bend loss of fibers are detailed analyzed and stabilities of subtraction, division and BRD methods are quantitatively compared for the first time to our knowledge. When the ambient temperature increased 1℃, the deviation of division method was only 0.29%, which obviously outperformed the subtraction method (2.90%) and the BRD method (0.55%). Furthermore, new conception "power fluctuation rejection ratio" (PFRR) is introduced to compare the suppressing effect of subtraction, division and BRD on the laser light source power fluctuation. Study results demonstrated that the division method provided better stability in the case of changing bend loss of fiber. The validity and reliability are fully verified by the fact that experimental results give a good agreement with the theoretical simulation.

Keywords (OCIS):

• (010.7340) Atmospheric and oceanic optics : Water
• (040.5160) Detectors : Photodetectors
• (060.2370) Fiber optics and optical communications : Fiber optics sensors
• (140.3518) Lasers and laser optics : Lasers, frequency modulated
• (280.4788) Remote sensing and sensors : Optical sensing and sensors
• (280.6780) Remote sensing and sensors : Temperature

High-sensitivity optical humidity sensor based on a thin dielectric waveguide

• R. Ribeiro, J. Domenegueti, and S. Zilio
• received 02/22/2013; accepted 05/20/2013; posted 05/21/2013; Doc. ID 185805
• [full text: PDF (585) KB)]
• Abstract: A low-cost, high-sensitivity humidity sensor based on a low-loss dielectric thin film waveguide is presented. The guided mode is produced by coupling laser light into the film by optical tunneling through a solid gap deposited on the base of a semi-cylindrical lens. The light reflected from this optical system carries information about the refractive index of the medium neighboring the waveguide, and is detected by a low cost CCD linear sensor and analyzed with a micro-controller or personal computer. The technique presents good sensitivity to relative humidity changes, especially below 10%RH, linear behavior between 20 and 80%RH and a response time of a few seconds.

Keywords (OCIS):

• (230.7390) Optical devices : Waveguides, planar
• (310.2790) Thin films : Guided waves
• (310.6845) Thin films : Thin film devices and applications
• (010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

Characterization of a Compressive Imaging System using Laboratory and Natural Light Scenes

• Stephen Olivas, Yaron Rachlin, Lydia Gu, Brian Gardiner, Robin Dawson, Juha-Pekka Laine, and Joseph Ford
• received 02/28/2013; accepted 05/19/2013; posted 05/21/2013; Doc. ID 185364
• [full text: PDF (20705) KB)]
• Abstract: Compressive imagers acquire images, or other optical scene information, by a series of spatially filtered intensity measurements, where the total number of measurements required depends on the desired image quality. Compressive imaging (CI) offers a versatile approach to optical sensing which can improve SWaP for hyperspectral imaging or feature-based optical sensing. Here we report the first (to our knowledge) systematic performance comparison of a CI system to a conventional focal plane imager for binary, grayscale, and natural light (visible color and infrared) scenes. We generate 1024x1024 images from a range of measurements 0.1% to 100%) made using digital (Hadamard), grayscale (Discrete Cosine Transform) and random (noiselet) CI basis sets, and for varying numbers of measurements. Comparing the outcome of the compressive images to conventionally acquired images, each made using 1% of full sampling, we conclude that the Hadamard Transform offered the best performance and yielding images with comparable aesthetic quality and slightly higher spatial resolution than conventionally acquired images.

Keywords (OCIS):

• (100.0100) Image processing : Image processing
• (110.0110) Imaging systems : Imaging systems
• (110.1758) Imaging systems : Computational imaging

Symmetric Moving-Optical-Wedge Interferometer for Fourier Transform Spectroscopy. A Step Toward Miniaturization

• Tarek Al-Saeed
• received 02/27/2013; accepted 05/19/2013; posted 05/20/2013; Doc. ID 186106
• [full text: PDF (1181) KB)]
• Abstract: In this paper we propose a modification to the ordinary moving-optical–wedge interferometer used for Fourier transform spectrometry. In ordinary wedge interferometer there are two arms, moving arm consisting of one stationary wedge and one moving wedge, and the reference arm consists of a parallel plate. This structure suffers from asymmetry in visibility pattern, asymmetry in the interfrogram, large volume and weight of the moving wedge and large optical path difference span required to attain the needed spectral resolution. These last two aspects make the interferometer hard to design by micro-electromechanical systems. Our proposed modification is to replace the parallel plate in the reference arm by two wedges one stationary and one moving. This last moving wedge will be responsible for negative optical differences and the moving wedge in the moving arm will be responsible for positive optical differences. This results in symmetry in visibility pattern and symmetry in interferogram. Further, dimensions of the wedges will be halved and the motion of each wedge will be halved. Thus, this structure results in miniaturization of wedge and motion. Moreover, this configuration gives more throughput.

Keywords (OCIS):

• (120.3180) Instrumentation, measurement, and metrology : Interferometry
• (300.6190) Spectroscopy : Spectrometers
• (300.6250) Spectroscopy : Spectroscopy, condensed matter

Hybrid Source Mask Optimization for Robust Immersion Lithography

• Xu Ma, Chunying Han, Yanqiu Li, Bingliang Wu, Zhiyang Song, Lisong Dong, and Gonzalo Arce
• received 04/12/2013; accepted 05/18/2013; posted 05/20/2013; Doc. ID 188691
• [full text: PDF (716) KB)]
• Abstract: To keep pace with the shrinkage of critical dimension (CD), source and maskoptimization (SMO) has emerged as a promising resolution enhancement technique (RET) to push the resolution of 193nm argon fluoride (ArF) immersionlithography systems. However, most of current pixelated SMO approachesrelied on scalar imaging models that are no longer accurate for immersionlithography system with hyper-NA (NA>1). This paper develops a robusthybrid SMO (HSMO) algorithm based on a vector imaging model capableof effectively improving the robustness of immersion lithography systems todefocus and dose variations. The proposed HSMO algorithm includes twosteps. First, the individual source optimization (SO) approach is carried outto rapidly reduce the cost function. Subsequently, the simultaneous SMO(SISMO) approach is applied to further improve the process robustness byexploiting the synergy in the joint optimization of source and mask patterns.The conjugate gradient method is used to update the source and mask pixels.In addition, a source regularization approach and source post-processing areboth used to improve the manufacturability of the optimized source patterns.Compared to the mask optimization (MO) method, the HSMO algorithmachieves larger process windows, i.e., extend the depth of focus (DOF) andexposure latitude (EL), thus more effectively improving the process robustness of 45nm immersion lithography systems.

Keywords (OCIS):

• (050.5080) Diffraction and gratings : Phase shift
• (100.3190) Image processing : Inverse problems
• (110.4980) Imaging systems : Partial coherence in imaging
• (110.5220) Imaging systems : Photolithography
• (110.2945) Imaging systems : Illumination design

Сurved laser microjet in near field

• Victor Kotlyar, Sergey Stafeev, and Alexey Kovalev
• received 03/14/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 187058
• [full text: PDF (1356) KB)]
• Abstract: With use of the FDTD-based simulation and a scanning near-field microscope that has a metal cantilever tip the diffraction of a linearly polarized plane wave of wavelength λ by a glass corner step of height 2λ is shown to generate a low divergence photonic nanojet of a hyperbolic form. The bended nanojet of the full-width half-maximum length DOF=9.5λ has the diameter FWHM=1.94λ over the distance 5.5λ and the intensity maximum 5 times the incident wave intensity. The discrepancy between the analytical and the experimental results amounts to 11%. The diffraction fields resulting from the diffraction of the plane wave by the corner phase step and a slit in an opaque screen are shown to be similar in structure.

Keywords (OCIS):

• (050.1380) Diffraction and gratings : Binary optics
• (050.1940) Diffraction and gratings : Diffraction
• (180.4243) Microscopy : Near-field microscopy

Development of a Dual-Pump CARS System for Measurements in Supersonic Combustion

• Gaetano Magnotti, Andrew Cutler, and Paul Danehy
• received 03/20/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 187467
• [full text: PDF (1774) KB)]
• Abstract: This work describes the development of a dual-pump CARS system for simultaneous measurements of temperature and absolute mole fraction of N2, O2 and H2 in supersonic combusting flows. Changes to the experimental set-up and the data analysis to improve the quality of the measurements in this turbulent, high-temperature reacting flow are described. The accuracy and precision of the instrument have been determined using data collected in a Hencken burner flame. For temperature above 800 K, errors in absolute mole fraction are within 1.5%, 0.5%, and 1% of the total composition for N2, O2 and H2, respectively. Standard deviations based on 500 single shots are between 10 K and 65 K for the temperature, between 0.5% and 1.7% of the total composition for O2, and between 1.5% and 3.4% for N2. The standard deviation of H2 is ~10% of the average measured mole fraction.

Keywords (OCIS):

• (120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
• (120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
• (190.1900) Nonlinear optics : Diagnostic applications of nonlinear optics
• (300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering

Athermal directions in KGd(WO4)2 and KLu((WO4)2 crystals under uniform heating

• V. Filippov
• received 01/29/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 184430
• [full text: PDF (499) KB)]
• Abstract: Athermal propagation directions in KGd(WO4)2 and KLu((WO4)2 crystals are found for two configurations (mono-lithic and laser cavity) at two wavelengths of 633 and 1064 nm. Four branches of solutions exist in KGd(WO4)2 and for the laser cavity configuration in KLu((WO4)2; for the monolithic configuration there are one or two branches for wave-lengths of 633 and 1064 nm, respectively. Two of the branches for the laser cavity configuration pass in the vicinity of the crystal optical axis where solutions are extremely sensitive to the direction of propagation. In some cases discrep-ancy in thermooptic and thermal expansion parameters found by different authors may lead to appearance (disappearance) of athermal directions.

Keywords (OCIS):

• (140.0140) Lasers and laser optics : Lasers and laser optics
• (140.3380) Lasers and laser optics : Laser materials
• (140.3410) Lasers and laser optics : Laser resonators
• (140.3580) Lasers and laser optics : Lasers, solid-state
• (140.4780) Lasers and laser optics : Optical resonators
• (140.6810) Lasers and laser optics : Thermal effects
• (160.0160) Materials : Materials
• (160.1190) Materials : Anisotropic optical materials
• (160.3380) Materials : Laser materials
• (160.4670) Materials : Optical materials
• (160.4760) Materials : Optical properties
• (230.5750) Optical devices : Resonators
• (260.0260) Physical optics : Physical optics
• (260.1180) Physical optics : Crystal optics
• (260.1440) Physical optics : Birefringence

Determination of the bulk scattering parameters of diffusing materials

• Sven Leyre, Frédéric Leloup, Jan Audenaert, Guy Durinck, Johan Hofkens, Geert Deconinck, and Peter Hanselaer
• received 02/25/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 185920
• [full text: PDF (773) KB)]
• Abstract: Diffusors are widely used optical components having numerous applications. They are commonly used to homogenize light beams and to create particular intensity distributions. The angular scattering profile of bulk scattering diffusing materials is determined by three bulk scattering parameters which are however not commonly available. This hampers an accurate implementation of bulk diffusors in ray tracing simulations. In this paper, the bulk scattering parameters of a concentration series of milk diluted with water were determined with the inverse adding-doubling method. Using these values as input, the macroscopic angular scattering profile was simulated using ray tracing software. The simulation results were compared to experimental data and a good agreement between measured and simulated data was found. The method was also proven to be successful when applied to commercial diffusors.

Keywords (OCIS):

• (290.4210) Scattering : Multiple scattering
• (290.5820) Scattering : Scattering measurements
• (290.1483) Scattering : BSDF, BRDF, and BTDF

A simulation method for evaluating progressive addition lenses

• Linling Qin, Lin Qian, and Jingchi Yu
• received 04/08/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 188186
• [full text: PDF (2452) KB)]
• Abstract: Since progressive addition lenses (PALs) are currently the state of the art in multifocal correction for presbyopia, it is important to study the methods for evaluating progressive addition lenses. In this paper, a simulation method based on the non-optical approach is proposed to characterize PALs during the design and optimization process. This method involves direct theoretical calculation of each lens surface according to the vector heights of front and rear surface. An example evaluated by the simulation method is given. Comparisons between simulation method and Rotlex method indicate that the simulation method can be used to evaluate the optical properties of PALs. In conclusion, the simulation method, adding a "correction action" to the design process, is potentially a useful method with some advantages such as time-saving, convenient and efficient. Especially, the simulation method on eye-plus-lens model, which is established through accurate ray tracing calculation along the direction of the sight line, is more suitable to actually evaluate the wearer performance and further optimize the design in pursuit of more comfortable, satisfactory and personalized PALs given the simulation results of wearer power.

Keywords (OCIS):

• (220.1250) Optical design and fabrication : Aspherics
• (220.3620) Optical design and fabrication : Lens system design
• (220.3630) Optical design and fabrication : Lenses
• (220.4840) Optical design and fabrication : Testing
• (230.1150) Optical devices : All-optical devices
• (330.4460) Vision, color, and visual optics : Ophthalmic optics and devices

Inspection of freeform intraocular lens topography by phase measuring deflectometric methods

• Alexis Speck, Benedikt Zelzer, Marc Kannengießer, Achim Langenbucher, and Timo Eppig
• received 04/03/2013; accepted 05/17/2013; posted 05/20/2013; Doc. ID 188200
• [full text: PDF (1250) KB)]
• Abstract: Manufacturing spherical, aspheric and freeform surfaces requires testing throughout the development and production process. State of the art topography measurement is limited in applicability for intraocular lenses (IOLs) and there is no dedicated commercial surface measurement system available for freeform IOLs. The purpose of this work was to validate a deflectometric setup for surface measurement, detection of defects and shape fidelity analysis for the development and production of intraocular lenses. The setup is based on a phase measuring deflectometer with a field of view of 80 x 80 mm² and a mean repetition accuracy of 1.6 • e-3 D. The technique is suitable for detection of global and local surface errors, extracted from geometry and topography analysis. For validation according to DIN ISO 5725:2002 spherical intraocular lenses with a radius of curvature (ROC) of 10.0 mm and 20.0 mm a commercial aspheric IOL and single sided free-form IOL samples were used.

Keywords (OCIS):

• (120.4630) Instrumentation, measurement, and metrology : Optical inspection
• (120.4820) Instrumentation, measurement, and metrology : Optical systems
• (170.4460) Medical optics and biotechnology : Ophthalmic optics and devices
• (170.4470) Medical optics and biotechnology : Ophthalmology
• (220.3630) Optical design and fabrication : Lenses
• (220.4840) Optical design and fabrication : Testing

High efficiency Nd:LuVO4 quasi-three-level 916 nm laser under polarized pumping

• Renpeng Yan, Jing Gao, and Xin Yu
• received 03/21/2013; accepted 05/15/2013; posted 05/17/2013; Doc. ID 187564
• [full text: PDF (586) KB)]
• Abstract: An efficient laser diode pumped Nd:LuVO4 916 nm laser by using the polarized pumping is reported. The maximum continuous-wave output power of 4.75 W is achieved at the incident pump power of 27.8 W, with an optical-to-optical efficiency of ~17.1% and a slope efficiency of ~29.5%. The slope efficiency is up to 45.4% with respect to the absorbed pump power and nearly 1.7 times higher than the previous results ever reported under the 808 nm diode laser pumping. The beam quality is measured to be M2~2.3 at the output power of 4.75 W. © 2013 Optical Society of America

Keywords (OCIS):

• (140.0140) Lasers and laser optics : Lasers and laser optics
• (140.3480) Lasers and laser optics : Lasers, diode-pumped
• (140.3530) Lasers and laser optics : Lasers, neodymium
• (140.3580) Lasers and laser optics : Lasers, solid-state

Coherent Optical Сorrelator Based on Combined Halftone and Position Modulation of Light Phase

• Vasily Ezhov, Natalya Vasilyeva, Stepan Andreev, Vladlen Korobkin, Vitaly Trofimov, Peter Ivashkin, Olga Garanina, and Ivan Randoshkin
• received 04/04/2013; accepted 05/15/2013; posted 05/17/2013; Doc. ID 188145
• [full text: PDF (654) KB)]
• Abstract: Usually only a halftone (grayscale) modulation of light is used to present the processed and reference signals in the input plane of analog coherent optical (ACO) correlators, based on spatial integrating the product of two (processed and reference) signals. The halftone modulation requires two transparencies to record two signals separately as the desired product of two spatial signals is obtained by sequential location of two spatial halftone records along the light path. Such optical layout leads to the need for precision mutual alignment of two separate signal recordings. This paper presents a one-stage ACO correlation method based on combined halftone and position modulation of light phase which is produced by joint phase recording two signals on a single transparency. The joint phase recording provides the high optical efficiency of informational light modulation, automatically supports the spatial coincidence of corresponding elements of both recorded signals and providing the same spatial scale for both recordings. The suggested method can also be used for introducing phase weight functions in the schemes of space-time ACO processing of wave signals.

Keywords (OCIS):

• (070.0070) Fourier optics and signal processing : Fourier optics and signal processing
• (070.1170) Fourier optics and signal processing : Analog optical signal processing
• (070.4550) Fourier optics and signal processing : Correlators

Wedge-plate Shear for Focus-shifting Testing in Single-shot Laser System

• Zhao Juanning, Dong Xiaona, Gao Limin, and Li Hongguang
• received 12/06/2012; accepted 05/15/2013; posted 05/15/2013; Doc. ID 180084
• [full text: PDF (763) KB)]
• Abstract: A Wedge-plate shear shifting system (WPSS) with adjustable accuracy and measuring range is proposed for measuring the focus-shifting caused by thermal distortion in a single-shot laser system. Two Beam Splitter Groups (BSG) are used in this method to precisely split a single beam into multiple beams with different optical path difference (OPD). The focus-shifting is determined by position change of the minimum spot on detector. This method is convenience, economic, specia1ly it solves the problem of catching focus-shifting in ultra-short time.

Keywords (OCIS):

• (120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
• (120.4570) Instrumentation, measurement, and metrology : Optical design of instruments

(HM) A Graphene Based Tunable Terahertz and Infrared Band-Pass Filter

• M. Danaeifar, N. Granpayeh, A. Mohammadi, and A. Setayesh
• received 02/27/2013; accepted 05/15/2013; posted 05/15/2013; Doc. ID 186068
• [full text: PDF (789) KB)]
• Abstract: This paper presents a sheet of graphene as a simple band-pass filter in terahertz and infrared frequencies. Central frequency and quality factor of this band-pass filter can be tuned by changing the physical parameters such as substrate thickness, gate voltage, temperature, and conductivity of the graphene. Effects of these parameters on surface plasmon polariton waves and filter specifications are numerically depicted

Keywords (OCIS):

• (310.6860) Thin films : Thin films, optical properties
• (250.5403) Optoelectronics : Plasmonics

Simplified model for light scattering from granular materials of different moist.

• Sara Rosendahl, Johan Casselgren, and Mikael Sjödahl
• received 01/23/2013; accepted 05/14/2013; posted 05/15/2013; Doc. ID 183757
• [full text: PDF (599) KB)]
• Abstract: Reflection measurements have been performed on dry and moistened sand grains and glass spheres respectively. By looking at the reflection distribution in the plane of incidence a simple model for determining the water content has been proposed. The model is a combination of two sheared cosine-functions and it consists of only two parameters. One parameter controls whether the reflection is mainly in the forward or backward direction. The former is true when the water content is high and the latter when the material is dry. The other parameter gives an idea of the homogeneity of the material.

Keywords (OCIS):

• (280.0280) Remote sensing and sensors : Remote sensing and sensors
• (290.1990) Scattering : Diffusion
• (290.4210) Scattering : Multiple scattering
• (290.5820) Scattering : Scattering measurements

Size effect on the optical limiting in suspensions of detonation nanodiamond clusters

• Viatcheslav Vanyukov, Tatyana Mogileva, Gennady Mikheev, Aleksey Puzir, Vladimir Bondar, and Yuri Svirko
• received 02/26/2013; accepted 05/14/2013; posted 05/14/2013; Doc. ID 185608
• [full text: PDF (2466) KB)]
• Abstract: We report on the optical limiting in stable aqueous suspensions of detonation nanodiamond clusters with average size of 50, 110 and 320 nm. The nanosecond Z - scan experiments at wavelength of 532 nm revealed that the larger the cluster size, the better the optical limiting performance and the higher the ray stability of the nanodiamond suspension. Our analysis showed that the nonlinear scattering and the nonlinear absorption are the dominant mechanisms of optical limiting in aqueous nanodiamond suspensions.

Keywords (OCIS):

• (190.4400) Nonlinear optics : Nonlinear optics, materials
• (160.4236) Materials : Nanomaterials