Measuring temperature profiles in high-power optical fiber components

Goloborodko, V.; Keren, Shay; Rosenthal, Amir; Levit, Boris; Horowitz, Moshe

doi:10.1364/ao.42.002284

Cited by 49 publications

(20 citation statements)

References 13 publications

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“…This temporal feature leads to a double-scaled autocorrelation trace with a sub-picosecond peak riding upon a wide and smooth sub-nanosecond pedestal, suggesting a characteristic of low temporal coherence. Therefore, noise-like pulses find various applications that take advantage of their low temporal coherence, such as optical metrology, optical sensing [15,16], optical coherence tomography, and optical communications [17][18][19]. On the other hand, by taking advantage of their smooth and broad spectra, noise-like pulses have been proposed as pump pulses for supercontinuum generation in nonlinear fibers [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum generation in highly nonlinear fibers using amplified noise-like optical pulses

Lin¹,

Hwang²,

Liu³

2014

Opt. Express

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Supercontinuum generation in a highly nonlinear fiber pumped by noise-like pulses from an erbium-doped fiber ring laser is investigated. To generate ultrabroad spectra, a fiber amplifier is used to boost the power launched into the highly nonlinear fiber. After amplification, not only the average power of the noise-like pulses is enhanced but the spectrum of the pulses is also broadened due to nonlinear effects in the fiber amplifier. This leads to a reduction of the peak duration in their autocorrelation trace, suggesting a similar extent of pulse compression; by contrast, the pedestal duration increases only slightly, suggesting that the noise-like characteristic is maintained. By controlling the pump power of the fiber amplifier, the compression ratio of the noise-like pulse duration can be adjusted. Due to the pulse compression, supercontinuum generation with a broader spectrum is therefore feasible at a given average power level of the noise-like pulses launched into the highly nonlinear fiber. As a result, supercontinuum generation with an optical spectrum spanning from 1208 to 2111 nm is achieved using a 1-m nonlinear fiber pumped by amplified noise-like pulses of 15.5 MHz repetition rate at an average power of 202 mW.

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Section: Introductionmentioning

confidence: 99%

Supercontinuum generation in highly nonlinear fibers using amplified noise-like optical pulses

Lin¹,

Hwang²,

Liu³

2014

Opt. Express

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“…They demonstrated their findings on the TFB 1Â7 splitter using a 1.00 mm core diameter, 0.22 numerical aperture (NA) input fiber coupled with seven 400 micron core, 0.22 NA output fibers, that were tested up to 860 W at 976 nm [12]. The TFB device has, so far, passed high power operation standards [13,14].…”

Section: Fiber Laser Beam Combinationmentioning

confidence: 95%

High-power fiber laser combination technology

Chen

Yanɡ

et al. 2009

Front. Optoelectron. China

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Research on fiber laser combination is discussed briefly in this paper. High-power double clad-fiber laser beam combination technology is introduced and different kinds of fiber laser beam combination and coherent combination technologies are evaluated. Tapered fused bundle (TFB) couplers are used in laser combine for higher power. In this paper, the theory and progress in TFB coupling are introduced. The experiment on our selffabricated TFB is presented. The efficiency of the fiber coupler exceeded 70% and increased as the input power went up. A maximum total output power of 689 W was obtained, with an efficiency of 74%. The fiber coupler displayed stability during the course of the experiment, without any cooling provided.

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“…Capillary tubes transecting the adhesive bond in the radial and longitudinal axis were introduced to allow high reflectivity Bragg gratings to be positioned for profiling. Braggs had previously been used for temperature assessment under high power illumination, where thermocouples suffer from large absorption of the optical field [4] . Figure 6 shows the good correlation between IR camera imaging and Bragg temperature reading for samples of various configurations prepared for this investigation.…”

Section: Adhesive Temperature Profilementioning

confidence: 99%

Tapered fused bundle coupler package for reliable high optical power dissipation

Seguin¹,

Wetter²,

Martineau³

et al. 2006

Fiber Lasers III: Technology, Systems, and Applications

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Light absorption in structural adhesives constitutes the main source of heat in tapered fused bundle (TFB) devices. Efficient heat dissipation solutions were developed by studying these thermal loads. The relative merits of transparent vs. opaque package designs were established experimentally. In the former, light escapes without being absorbed by the package walls, whereas in the latter, the spurious optical signal is directly absorbed and dissipated. The fact that heat is generated directly in the adhesive largely favors the opaque package, which offers more efficient heat extraction. By using a thermally conductive package, a temperature rise of 1.1°C per Watt of dissipated power was measured. These numbers demonstrate that passive heat sinking at 20°C is sufficient to allow reliable operation up to 45Watts of dissipated power (1kW with 0.2dB optical loss) without compromising long-term reliability.

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Measuring temperature profiles in high-power optical fiber components

Cited by 49 publications

References 13 publications

Supercontinuum generation in highly nonlinear fibers using amplified noise-like optical pulses

Supercontinuum generation in highly nonlinear fibers using amplified noise-like optical pulses

High-power fiber laser combination technology

Tapered fused bundle coupler package for reliable high optical power dissipation

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