• Analytical Science and Technology
• /
• v.8 no.4
• /
• pp.1101-1108
• /
• 1995

Acousto-optic tunable filter is a compact, all solid state electronic dispersive device. It is based on the acousto-optic interaction in an anisotropic crystal. Compared to conventional grating monochromators. the AOTF has no moving parts, wider spectral tuning range (from UV through visible and near-IR to IR), higher throughput, higher resolution, faster scanning (${\mu}s$) and random wavelength access. These features make it possible to use the filter to develop novel instruments which are not possible otherwise. The instrument development and unique advantages of such AOTF based instruments including the multidimensional fluorimeter, the multiwavelength thermal lens spectrometer, and the detectors for HPLC and flow injection analysis are described.

• Proceedings of the KSME Conference
• /
• 2004.11a
• /
• pp.607-612
• /
• 2004

Spectral resolution enhancement method of Acousto-Optic Tunable Filter (AOTF) using incident light angle variation is described. AOTF is a small, mechanically rigid, high speed and spectral resolution light tunable filter. The basic theory of AOTF and its experimental verification is described. AOTF can generate two opposite polarized light simultaneously which wavelength can be changed by incident angle variation. We focused on the common region of two filtered light at the specific incident angle. This region can be used to enhance the spectral resolution of AOTF.

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.02a
• /
• pp.168-169
• /
• 2001

1.55 $\mu\textrm{m}$ 파장 대역에서 동작하는 파장가변 단일 주파수 레이저는 WDM 통신 시스템, 광섬유 센서, 분광학 분야에 유용하게 사용될 수 있다. 특히 어븀첨가 광섬유 레이저로 파장가변 단일 주파수 레이저를 구현하면 선폭이 가늘고, 세기 잡음이 작고, 출력 세기가 크다는 장점이 있기 때문에 많은 연구가 있어 왔다. 본 논문에서는 음향광학 대역투과 필터 (acousto-optic tunable bandpass filter, AOTBF)와 광섬유 흡수 격자를 사용하는 선형공진기 형태의 파장가변 단일 주파수 광섬유 레이저에 대해서 제안하고 구현하였다. (중략)

• Proceedings of the Optical Society of Korea Conference
• /
• 1995.06a
• /
• pp.210-215
• /
• 1995

Technology development toward the use of LiNbO3-based acoustic tunable filters as WDM 2$\times$2 cross-connect switches is reviewed. Recenly, it was found that a fundamental behavior of multi-wavelength Bragg scattering critically affects the crosstalk performance of the acousto-optic tunable filter. We revuew serveral reported methods of overcoming the performance degradation. We will eventually ask whether the device is up to task of WDM optical switching.

• Journal of the Optical Society of Korea
• /
• v.12 no.4
• /
• pp.281-287
• /
• 2008

An acousto-optic tunable filter based 3-D micro surface profile measurement using an equally spaced 5 spectral phase shifting is described. The 5-bucket spectral phase shifting method is compared with a Fourier-transform method in the spectral domain. It can provide a fast measurement capability while maintaining high accuracy since it needs only 5 pieces of spectrally phase shifted imaging data and a simple calculation in comparison with the Fourier transform method that requires full wavelength scanning data and relatively complicated computation. The 3-D profile data of micro objects can be obtained in a few seconds with an accuracy of ${\sim}10nm$. The 3-D profile method also has an inherent benefit in terms of being speckle-free in measuring diffuse micro objects by employing an incoherent light source. Those simplicity and practical applicability is expected to have diverse applications in 3-D micro profilometry such as semiconductors and micro-biology.

• Proceedings of the Optical Society of Korea Conference
• /
• 1996.09a
• /
• pp.66-66
• /
• 1996

• Proceedings of the Optical Society of Korea Conference
• /
• 2008.07a
• /
• pp.139-140
• /
• 2008

We demonstrate a novel acousto-optic filter using a two-mode photonic crystal fiber. Thanks to endless two-mode operation of the fiber, single notch over a whole spectrum is obtained with tuning range of> 1000 nm.

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.105.4-105
• /
• 2001

This paper describes a newly designed multipoint process monitoring system based on a NIR acousto-optic tunable filter. The NIR multipoint process monitoring system consists of a NIR AOTF device for wavelength selection, an InGaAs array sensor, and a specially designed iin-line type of optical fiber probe. Unlike a FTS(Fourier Transform Spectrometry) or grating based monitoring system, an AOTF has no moving parts, and it can be rapidly tuned to any wavelength in its operating range within microseconds. Thus, the AOTF is advantageous in terms of faster spectral imaging capability and rigidity required for industrial monitoring environment. In the current feasibility evaluation, an enhanced optical fiber probe with 3 monitoring points was used. However, ...

• Journal of the Korean Society for Precision Engineering
• /
• v.25 no.5
• /
• pp.89-95
• /
• 2008

The Acousto-Optic Tunable Filter (AOTF) is a high-speed full-field monochromator which generates two spectrally filtered light beams with ordinary and extraordinary polarization state. Thus, AOTF is widely used to build full-field spectral imaging system or spectral domain interferometer. However, AOTF has a big problem that the angle of diffracted light changes according to the scanning of wavelength, which makes image shift on CCD plane In this paper, we propose an analytic design of prism system to compensate the image shift. The detailed analysis of light paths in a prism and basic experimental results are presented to verify our proposed compensation method. The experimental results agree with simulation results based on suggested prism model and image shift is minimized at optimal condition. Also, it can be extended to compensate the image shift for ordinary and extraordinary polarized light simultaneously.

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.07a
• /
• pp.52-53
• /
• 2002

파장분할 다중화 광통신 선로 상에서, 특정 파장 채널을 임의로 선택하여 분리/첨가 할 수 있는 동적파장가감기(wavelength-division dynamic optical add-drop multiplexer)는 광 네트워크의 효율을 높이는데 핵심 소자라 할 수 있다. 지난 수년간 개발된 수많은 기술들 중에서, LiNbO$_3$ 광도파로 음향광학소자(acousto-optic tunable filter： AOTF)는 몇 가지의 특징적인 장점들을 보여줬는데, 예를 들면 넓은 영역의 파장 선택성, 짧은 스위칭 시간, 다중 채널 동작 가능성 등이다. (중략)