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Volume 41, Issue 12
Special Issue on Recent Topics of Optical Imaging
Displaying 1-12 of 12 articles from this issue
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Special Issue on Recent Topics of Optical Imaging
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Yoichiroh HOSOKAWA2013 Volume 41 Issue 12 Pages 980-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSWhen an intense infrared femtosecond laser is focused inside aqueous culture medium through an objective lens, shockwave and cavitation bubble are generated at the laser focal point by multiphoton excitation. As the result, an impulsive force due to the shockwave propagation and the cavitation bubble generation propagates from the laser focal point, and interacts with biological cells at the vicinity of the laser focal point. We quantify the impulsive force utilizing atomic force microscopy (AFM) and apply it to estimate mechanical response of single animal cells. These results are summarized and the future potential was suggested.View full abstractDownload PDF (1276K)
Special Issue
Laser Review
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Jun TANIDA2013 Volume 41 Issue 12 Pages 985-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL FREE ACCESSDownload PDF (169K) -
Masayuki YOKOTA2013 Volume 41 Issue 12 Pages 986-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSDigital holography is a technique in which an interference fringe pattern called a “hologram” is captured by a digital camera, and then it is reconstructed by calculating the Fresnel diffraction integral on a computer. Recently, many kinds of holographic applications, such as holographic interferometry, threedimensional display, and microscopy, are being investigated in many fi elds. This paper reviews recent progress in digital holography and introduces some developments for industrial applications.View full abstractDownload PDF (656K) -
Yuri MURAKAMI2013 Volume 41 Issue 12 Pages 991-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSMultispectral imaging has been used in a wide verity of industrial as well as research applications. With expanding use of it, methods and devices of multispectral imaging have also advanced. This article reviews multispectral imaging methods from conventional to recently-proposed one, which have developed toward the realization of one-shot imaging or compact imaging systems. In addition, spectral image acquisition methods which require spectrum reconstruction process are introduced. As one of such methods, hybrid-resolution spectral imaging method is explained in detail with experimental results.View full abstractDownload PDF (887K) -
Kouichi NITTA2013 Volume 41 Issue 12 Pages 996-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSGhost imaging (GI) with thermal light is introduced. Procedure and principle of signal processing are summarized. Computational GI (CGI) and examples of its applications are shown. CGI is important because optical hardware is much simpler than the conventional GI. Also, a method to implement the CGI is shown. This method is considered to be suitable for short time measurement.View full abstractDownload PDF (1014K) -
Ryoichi HORISAKI2013 Volume 41 Issue 12 Pages 1001-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSCompressive sensing enables us to observe large object data with fewer measurements than conventional sensing schemes. It has achieved single-shot or fast imaging to acquire various optical information, for examples two-dimensional image, depth, spectrum, polarization, super-resolution, and wide field-ofview. This paper surveys recent contributions of compressive sensing in the fi eld of optical imaging.View full abstractDownload PDF (1448K) -
Barry CENSE, Isamuddin IBRAHIM2013 Volume 41 Issue 12 Pages 1006-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSOCT is a non-invasive technique for three-dimensional imaging at high axial resolution. Due to aberrations in the eye, OCT systems for retinal imaging have a limited lateral resolution. The lateral resolution can be increased by using adaptive optics (AO) to correct for static and dynamic wavefront aberrations. The combination of these two technologies results in high quality AO-OCT images to image photoreceptors, capillaries and nerve fi ber bundles, which can help retinal specialists to better understand and diagnose retinal diseases. Here we review the basic principles of AO-OCT and discuss future opportunities for the technology.View full abstractDownload PDF (873K) -
Shinichi KOMATSU2013 Volume 41 Issue 12 Pages 1012-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSWavefront coded imaging enables large extension of the depth of field. The principle of the method is described in terms of Fourier optics as well as ray optics. Essential similarity between Wavefront coding and Airy beam is briefly discussed. Recent improvements and applications concerning Wavefront coding are also introduced.View full abstractDownload PDF (924K)
Laser Original
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Yoshio HAYASAKI, Quang Duc PHAM2013 Volume 41 Issue 12 Pages 1017-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSA new optical profi lometer using an ultra-stable mode-locked frequency comb femtosecond laser and a single pixel camera is described. The ultra-stabilized frequency comb was used to measure an object with a large depth, wide dynamic range without 2π phase ambiguity. The single pixel camera was used to obtain the object profi le information without a mechanical scanning. A two-dimensional sampling method with one-half of the sampling points was proposed. It was peformed with generating a reversal signal from a subtraction of the summed signal. We demonstrated the surface profi lometry for an object with the depth of several centimeters. The RMS error for 6 × 6 mesurment points was 8.2 μm.View full abstractDownload PDF (952K)
Regular Paper
Laser Original
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Keisuke TANAKA, Toshiaki SUHARA2013 Volume 41 Issue 12 Pages 1022-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSWe fabricated MgO:LiNbO3 (MgO:LN) thin fi lm waveguides by surface-activated bonding with metal layers and ion slicing with He+ ion implantation. He+ ions of 300 keV were implanted into MgO:LN crystals at a dose of 4.0 × 1016 ions/cm2 to slice thin fi lms by thermal treatment. We obtained 1-μmthick MgO:LN thin films on SiO2/Au/MgO:LN substrates. Laser light was end-fire coupled to the waveguide. The FWHM sizes in depth of the mode profi les were approximately 1.2 and 1.4 μm for 0.78 and 1.55 μm wavelengths, respectively. We obtained strongly confi ned guided modes.View full abstractDownload PDF (1210K) -
Shigeru OMORI2013 Volume 41 Issue 12 Pages 1027-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSWe demonstrated laser operation at 2.8 μm in a monolithic Er, Cr: YSGG laser pumped by a laser diode with a silica optical fi ber. Under a condition where the pumping beam spot sizes ranged from 90 μm to 140 μm using a 100-μm or a 200-μm core diameter fiber, we achieved maximum slope efficiency. During continuous operation, the output power reached 1.09 W at an incident power of 4.5 W without any active cooling. When the laser diode is driven by a square wave current where the repetition frequency ranged from 10 Hz to 10 kHz, the average output power of the higher frequency with a lower duty ratio decreases because of the delay of the pulse start timing.View full abstractDownload PDF (1521K) -
Shigeto SUGIMOTO, Tetsuya KIGUCHI, Michinobu MIZUMURA, Koichi KAJIYAMA ...2013 Volume 41 Issue 12 Pages 1031-
Published: 2013
Released on J-STAGE: September 07, 2020
JOURNAL OPEN ACCESSWe have developed a unique Nd:YAG laser source for laser annealing, which can oscillate with variable pulse duration. The pulse duration is electrically varied by three Pockels cells arranged in series. These Pockels cells are synchronized with each other. With this setup, we have achieved a variable pulse duration of 80-1300 ns by controlling the trigger timings and the applied voltages for each of the Pockels cells. In this report, the configuration of the laser source and the Q-switch control sequence are described. Moreover, qualitative annealing results obtained with the system are shown.View full abstractDownload PDF (2258K)
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