Stored Energy, Transmission Group Delay and Mode Field Distortion in Optical Fibers

Várallyay, Zoltán; Szipöcs, R.

doi:10.1109/jstqe.2014.2325394

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…Figure 4 a shows an output power of the transmitting fiber that can be obtained with this system. From the graph, the mode field energy of transmitting fiber mainly concentrates in the core, which is determined by the multimode fiber transmission characteristics [ 16 , 17 ]. The center energy changes with radius of the macro-bend on a small scale, but shifts significantly with the light source fluctuations, which means a low contribution to the macro-bend coupling effect.…”

Section: Experiments and Resultsmentioning

confidence: 99%

A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

Liu

Hou

Zhang

et al. 2017

Sensors

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This paper proposes the strategy of fabricating an all fiber wide-range displacement sensor based on the macro-bend coupling effect which causes power transmission between two twisted bending plastic optical fibers (POF), where the coupling power changes with the bending radius of the fibers. For the sensor, a structure of two twisted plastic fibers is designed with the experimental platform that we constructed. The influence of external temperature and displacement speed shifts are reported. The displacement sensor performance is the sensor test at different temperatures and speeds. The sensor was found to be satisfactory at both room temperature and 70 °C when the displacement is up to 140 mm. The output power is approximately linear to a displacement of 110 mm–140 mm under room temperature and 2 mm/s speed at 19.805 nW/mm sensitivity and 0.12 mm resolution. The simple structure of the sensor makes it reliable for other applications and further utilizations, promising a bright future.

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Section: Experiments and Resultsmentioning

confidence: 99%

A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

Liu

Hou

Zhang

et al. 2017

Sensors

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“…17 arouses laser safety concerns in this latter case. In both cases, dispersive properties of optical fibers [18] play an important role and can improve laser performance.…”

Section: The All-fiber All-normal Dispersion Yb-fiber Ring Oscillatormentioning

confidence: 99%

Handheld nonlinear microscope system comprising a 2 MHz repetition rate, mode-locked Yb-fiber laser for in vivo biomedical imaging

Krolopp

Csákányi

Haluszka

et al. 2016

Biomed. Opt. Express

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A novel, Yb-fiber laser based, handheld 2PEF/SHG microscope imaging system is introduced. It is suitable for imaging of murine skin at an average power level as low as 5 mW at 200 kHz sampling rate. Amplified and compressed laser pulses having a spectral bandwidth of 8 to 12 nm at around 1030 nm excite the biological samples at a ~1.89 MHz repetition rate, which explains how the high quality two-photon excitation fluorescence (2PEF) and second harmonic generation (SHG) images are obtained at the average power level of a laser pointer. The scanning, imaging and detection head, which comprises a conventional microscope objective for beam focusing, has a physical length of ~180 mm owing to the custom designed imaging telescope system between the laser scanner mirrors and the entrance aperture of the microscope objective. Operation of the all-fiber, all-normal dispersion Yb-fiber ring laser oscillator is electronically controlled by a two-channel polarization controller for Q-switching free mode-locked operation. The whole nonlinear microscope imaging system has the main advantages of the low price of the fs laser applied, fiber optics flexibility, a relatively small, light-weight scanning and detection head, and a very low risk of thermal or photochemical damage of the skin samples.

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“…Most of these problems might be solved by the application of dispersion-compensating [38,39] reversed-dispersion-slope hollow-core photonic bandgap fibers [40], but they are not commercially available and might have a similar problem of birefringence, resulting in double optical pulses at the fiber end in case of sub-100 fs pulses [33]. In this paper, we report on a fiber-coupled, low-repetition-rate, sub-ps Ti-sapphire laser system that is free from all of these problems and allows for fiber delivery with minimum temporal [33] and spatial [40,41] distortion of the optical pulses. The system was used to examine healthy skin, adult hemangioma and basal cell cancer in ex vivo skin biopsies.…”

Section: Introductionmentioning

confidence: 99%

A 20 MHz Repetition Rate, Sub-Picosecond Ti–Sapphire Laser for Fiber Delivery in Nonlinear Microscopy of the Skin

Krolopp,

Fésűs,

Szipőcs

et al. 2024

Life

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Nonlinear microscopy (NM) enables us to investigate the morphology or monitor the physiological processes of the skin through the use of ultrafast lasers. Fiber (or fiber-coupled) lasers are of great interest because they can easily be combined with a handheld, scanning nonlinear microscope. This latter feature greatly increases the utility of NM for pre-clinical applications and in vivo tissue imaging. Here, we present a fiber-coupled, sub-ps Ti–sapphire laser system being optimized for in vivo, stain-free, 3D imaging of skin alterations with a low thermal load of the skin. The laser is pumped by a low-cost, 2.1 W, 532 nm pump laser and delivers 0.5–1 ps, high-peak-power pulses at a ~20 MHz repetition rate. The spectral bandwidth of the laser is below 2 nm, which results in a low sensitivity for dispersion during fiber delivery. The reduction in the peak intensity due to the increased pulse duration is compensated by the lower repetition rate of our laser. In our proof-of-concept imaging experiments, a ~1.8 m long, commercial hollow-core photonic bandgap fiber was used for fiber delivery. Fresh and frozen skin biopsies of different skin alterations (e.g., adult hemangioma, basal cell cancer) and an unaffected control were used for high-quality, two-photon excitation fluorescence microscopy (2PEF) and second-harmonic generation (SHG) z-stack (3D) imaging.

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Stored Energy, Transmission Group Delay and Mode Field Distortion in Optical Fibers

Cited by 10 publications

References 18 publications

A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

Handheld nonlinear microscope system comprising a 2 MHz repetition rate, mode-locked Yb-fiber laser for in vivo biomedical imaging

A 20 MHz Repetition Rate, Sub-Picosecond Ti–Sapphire Laser for Fiber Delivery in Nonlinear Microscopy of the Skin

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