• Title/Summary/Keyword: Optical Interferometer

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MTF and wavefront error testing of large aperture optical system using unequal path interferometer (경로길이 불일치 간섭계를 이용한 대구경 광학계의 MTF 측정과 파면오차 검사)

  • Song, Jong-Sup;Jo, Jae-Heung;Lee, Yun-Woo;Song, Jae-Bong;Yang, Ho-Soon;Lee, In-Won
    • Korean Journal of Optics and Photonics
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    • v.16 no.1
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    • pp.50-55
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    • 2005
  • A method for measuring the wavefront error and the modulation transfer function(MTF) of large aperture optics using an unequal path interferometer is presented. A bidirectional shearing interferometer is used for collimation testing of the measurement system. A large aperture Fizeau interferometer with long optical path difference measures the wavefront error of the optics under test by using a $\Phi$ 400 mm off-axis parabolic mirror. The MTF is also measured at the wavelength of the interferometer by changing the laser light into partially incoherent light. Test results of a $\Phi$ 300 mm Cassegrain type satellite telescope made in Korea are presented.

Design of PLC Triplexer Using Three Waveguide Interferometer

  • Choi, Jun-Seok;Oh, Jin-Kyong;Lee, Dong-Hwan;Lee, Hyung-Jong;Kim, Sang-Duk
    • Journal of the Optical Society of Korea
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    • v.12 no.3
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    • pp.162-165
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    • 2008
  • A novel planar lightwave circuit(PLC) triplexer using a three-waveguide interferometer(TWI) is proposed and examined using the transfer matrix and the beam propagation methods. The proposed triplexer consists of two three-waveguide couplers and three waveguides connecting the couplers. Simulation for the TWI triplexer shows the excess losses of 0.03 dB and 0.94 dB with the crosstalks of -22.3 dB and -14.5 dB in reception, respectively, for the wavelength of 1490- and 1550-nm, while showing the excess loss of 1.75 dB in transmission for the wavelength of 1310 nm. The proposed design shows compact feature as short as 11.5 mm for the refractive-index contrast of 0.45%.

Optical Observations with Milliarcsecond Resolution of Stars, Their Environments and Companions

  • Sanborn, Jason J.;Zavala, Robert T.
    • Journal of Astronomy and Space Sciences
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    • v.29 no.1
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    • pp.63-67
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    • 2012
  • Observations with milliarsecond resolution using the Navy Optical Interferometer have been obtained for a number of stellar systems which include high-mass binaries, eclipsing binaries, and radio stars. These observations also reveal the previously unseen companions in single-lined spectroscopic binaries via directly measured flux ratios. We will present examples of published and ongoing research efforts of these systems to illustrate how an optical interferometer contributes to our knowledge of stars, their environment, and companions. These studies include a conclusive revealing of the previously unseen companion in the single-lined binary ${\Phi}$ Herculis, the direct determination of orbital parameters in the wide and close orbits of Algol, and revealing the orbit of ${\beta}$ Lyrae with spatially resolved images of the $H{\alpha}$ emission.

Diagnosis of Optical FSK Transmitter Output Characteristics Using Michelson Interferometer (Michelson 간섭계를 이용한 광 FSK 송신기 특성검출)

  • 박상영;이규송;임호근;전광석;김창민;홍완혜
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.10
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    • pp.806-813
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    • 1991
  • In this paper, we suggested the diagnosis of the optical FSK transmitter output characteristics using the Micheloson interferometer. The transmitter is designed by the direct frequency modulation effect of a semoconductor laser diode. The optical FSK transmitter consists of a temperature stabilized semiconductor laser diode and an optimally designed equalizer. It is modulated by 100Mbit/s PRBS Generator to diagonosis of Optical FSK transmitter output characteristics. The Michelson Interferometer is used for the optical frequency discriminator which transforms the output frequency of the transmitter to the amplitude of light. The measurement of the performance of the transmitter to the amplitude of light. The measurement of the performance of the transmitter computer the transmitted data and their eye pattern with the simulation results, the received data and their eye pattern. As the result of experiment, the data transfer rate of the transmitters is 100Mbit/s.

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Surface Topography by Using Digital Tolansky Interferometer (Digital Tolansky 간섭계의 개발과 이를 활용한 Surface Topography)

  • 정영욱
    • Proceedings of the Optical Society of Korea Conference
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    • 1990.02a
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    • pp.177-181
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    • 1990
  • Digital Tolansky interferometer which is Tolansky interferometer interfaced to the computer through CCD TV-camera, is developed and applied to the surface topography. First, resolution of this system is determined by minimum measurable thickness of thin film. Theoretical analysis and experimenatal results are compared. Second, surface topographic picture of thin is obtained by two orthogonal fringes. Using linear fitting method, height distribution of specimen is obtained and 3-dim. picture is plotted.

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Measurement of thermooptic coefficient by electronic speckle pattern interferometer (전자 스펙클 무늬 간섭계를 이용한 열광학계수 측정)

  • 윤재선
    • Korean Journal of Optics and Photonics
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    • v.3 no.2
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    • pp.101-104
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    • 1992
  • One of coefficients showing the degree of thermal effects is the thermooptic coefficient. It is the ratio of the refractive index change versus the change of temperture and was already measured by other general interferometric method. In this research, an optical system with the electronic speckle pattern interferometer complementing faults of the general interferometer was developed and its potentiality was validated experimentally.

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Proposal for a Wavelength-Independent Optical Sensor Based on an Asymmetric Mach-Zehnder Interferometer

  • Luo, Yanxia;Yin, Rui;Ji, Wei;Huang, Qingjie;Gong, Zisu;Li, Jingyao
    • Current Optics and Photonics
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    • v.4 no.6
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    • pp.558-565
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    • 2020
  • A wavelength-independent optical sensor based on an asymmetric Mach-Zehnder interferometer (AMZI) is proposed. The optical sensor based on an AMZI is very sensitive to wavelength, and wavelength drift will lead to measurement error. The optical sensor is compensated to reduce its dependence on wavelength. The insensitivity of the optical sensor to wavelength mainly depends on the compensation structure, which is composed of an AMZI cascaded with another AMZI and can compensate the wavelength drift. The influence of wavelength drift on the optical sensor can be counteracted by carefully designing the size parameters of the compensation structure. When the wavelength changes from 1549.9 nm to 1550.1 nm, the error after compensation can be lower than 0.066%. Furthermore, the effect of fabrication tolerance on compensation results is analyzed. The proposed compensation method can also be used to compensate the drift of other parameters such as temperature, and can be applied to the compensation of other interference-based optical devices.

Optical Encryption System based on Circular Polarization and Interferometer (원형 편광과 간섭계를 이용한 광 정보 보호 시스템)

  • 조규보;배효욱;신창목;서동환;김수중
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.02a
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    • pp.60-61
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    • 2003
  • We proposed an optical encryption system using circular polarization based on interferometer. The phase modulated input image, represented as orthogonal linearly polarized states respectively, is encrypted into circularly polarized states using polarization modulated masks. In the decryption we use the inverse matrix of polarization modulation mask and can recover the original polarization states.

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Synthesis and Analysis of Optical Transfer Function of the Modified Triangular Interferometer by Two - pupil Synthesis Method

  • Kim, Soo-Gil
    • Journal of the Optical Society of Korea
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    • v.8 no.4
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    • pp.182-187
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    • 2004
  • We synthesized and analyzed the optical transfer function(OTF) of the modified triangular interferometer (MTI) using two-pupil synthesis method. Also, we presented the optimal MTI, which can obtain any bipolar function by combining two wave plates and a linear polarizer. By using the proposed MTI, we can obtain the complex hologram without bias and conjugate image.

Preparation and Characterization of Flexible Optical Composite Films Based on Bragg-Structured Interferometer

  • Um, Sungyong;Sohn, Honglae
    • Journal of Integrative Natural Science
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    • v.6 no.4
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    • pp.244-250
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    • 2013
  • Three types of functionalized flexible optical composite films based on Bragg structure porous silicon interferometer have been successfully fabricated by casting a toluene solution of polystyrene onto the free-standing porous silicon. The optical properties of composite films are measured. Surface functionalization of porous silicon is determined by FT-IR measurement. Reflectance and transparence properties of composite films are measured for the possible application of tunable optical filter and indicate that the transmission peak occurred at the identical location where the reflection peak appeared.