Optical Coherence Tomography Based on a Continuous-wave Supercontinuum Seeded by Erbium-doped Fiber's Amplified Spontaneous Emission

Lee, Ju Han; Jung, Eun Joo; Kim, Chang-Seok

doi:10.3807/josk.2010.14.1.049

Cited by 12 publications

(5 citation statements)

References 38 publications

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“…Second harmonic generation (SHG) is a nonlinear optical process that generates twice the frequency of the incident light when the high intensity beam interacts with a nonlinear optical crystal. When a shorter wavelength SHG beam can be generated from a longer wavelength near-infrared fiber laser beam, it could be useful for a wide range of medical diagnostics [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Second Harmonic Generation of Multiple Wavelength Laser Outputs for Medical Sensing

Son

Song

Kang

et al. 2011

Sensors

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Multiple wavelength light sources in the medical spectral window region are useful for various medical sensing applications in tissue by distinguishing the absorption and scattering coefficients optically. We propose a simultaneous second harmonic generation of multiple wavelength fiber laser output using parallel channels of periodically-poled lithium niobate (PPLN) waveguides. High intensity dual wavelength lasing output is experimentally realized with two tunable fiber Bragg gratings of 1,547.20 nm and 1,554.48 nm for the efficient conversion to the half wavelengths, 773.60 nm and 777.24 nm, by using two parallel PPLN channels. Compared with a conventional dual second harmonic generation (SHG) configuration based on two different input wavelengths from each independent light source, this method has a relatively higher efficiency to align the input light beam into the adjacent parallel PPLN channels simultaneously. The use of fiber lasers offers several advantages since they are relatively inexpensive, provide high power in excess of tens of watts, are widely tunable, and can produce pulses from milliseconds to femtoseconds.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Second Harmonic Generation of Multiple Wavelength Laser Outputs for Medical Sensing

Son

Song

Kang

et al. 2011

Sensors

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“…In the schematic of the proposed FBG sensor system (linear cavity using a tunable PMF Sagnac mirror), the SOA has a 3 dB optical bandwidth of 80 nm from 1480 to 1560 nm. Compared with the erbium-doped fiber amplification (EDFA) scheme, the SOA or fiber Raman amplifier shows better performance for simultaneous multi-wavelength lasing, due to the inhomogeneous gain broadening effect [12][13][14]. The 50% optical signal in the cavity is coupled out through the 50:50 fiber coupler and the remaining 50% optical signal propagates through the lasing cavity in order to produce an effective optical signal.…”

Section: Experiments Results Of Fbg Laser Cavitymentioning

confidence: 99%

Characterization of variable reflectivity of a polarization-maintaining fiber Sagnac mirror for long-distance remote fiber Bragg gratings cavity sensors

Lee¹,

Lee²,

Kim³

et al. 2010

Meas. Sci. Technol.

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Variation of broadband reflectivity is experimentally characterized for a polarizationmaintaining fiber (PMF) Sagnac mirror. Theoretical analysis is also demonstrated using the Jones matrices of the PMF Sagnac mirror. Variable reflectivity is useful to enhance the signal performance of a long-distance remote fiber Bragg gratings (FBGs) cavity sensor at a range of tens of km. Controlling both the reflecting bandwidth and partial reflectivity assists the effective multi-wavelength lasing from the linear-type resonance cavity with FBG mirrors at one side and a PMF Sagnac mirror at the other. The FBG sensing signal achieves a high SNR of greater than ∼45 dB due to the cavity mirror effect.

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“…Both 1-D profiles and 2-D images obtained with this novel common-path OCT and the conventional common-path OCT are compared. The OCT image is implemented with a Fourier domain OCT (FD-OCT) system based on a wavelength-swept laser source and a balanced detector [9][10][11][12][13]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Post-tuning of Sample Position in Common-path Swept-source Optical Coherence Tomography

Park

Jeong

Kim

2011

Journal of the Optical Society of Korea

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Common-path interferometers are widely used for endoscopic optical coherence tomography (OCT) because an arbitrary arm length can be chosen for the endoscopic imaging probe. However, the scheme suffers from the limited range of the sample position distance from the end of the imaging probe because the position between the reference reflector and the sample is limited by the optical path-length difference (OPD) to induce an interference signal. In this study, we developed a novel method for compensating the arbitrary sample position in common-path swept-source OCT by adding an extra Mach-Zehnder interferometer in the post-path of the interfered optical signal. Theoretical analysis and an experimental demonstration of imaging depth tuning for the flexible sample position of an endoscopic OCT image are discussed. After post-tuning of sample position distance, the positioning limitation between the reference reflector and the sample can be solved for various sample positions over a range of 26 mm for the cross-sectional images of a fish eye sample.

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Optical Coherence Tomography Based on a Continuous-wave Supercontinuum Seeded by Erbium-doped Fiber's Amplified Spontaneous Emission

Cited by 12 publications

References 38 publications

Simultaneous Second Harmonic Generation of Multiple Wavelength Laser Outputs for Medical Sensing

Simultaneous Second Harmonic Generation of Multiple Wavelength Laser Outputs for Medical Sensing

Characterization of variable reflectivity of a polarization-maintaining fiber Sagnac mirror for long-distance remote fiber Bragg gratings cavity sensors

Post-tuning of Sample Position in Common-path Swept-source Optical Coherence Tomography

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