Single-Frequency Fiber Amplifiers for Next-Generation Gravitational Wave Detectors

Steinke, M.; Tünnermann, Henrik; Kuhn, Vincent; Theeg, T.; Karow, Malte; Varona, O. de; Jahn, Philipp; Booker, P.; Neumann, Jörg; Wesels, Peter; Kracht, Dietmar

doi:10.1109/jstqe.2017.2759275

Cited by 51 publications

(24 citation statements)

References 68 publications

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“…Fiber technology has been identified as a promising alternative to overcome limitations of the SSL system [6]. Fiber amplifiers enable very high output power levels and fulfill GWD requirements regarding low noise levels and exceptional beam quality (above 90 % TEM 00 -mode content).…”

Section: Introductionmentioning

confidence: 99%

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

et al. 2019

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Low noise, high power single-frequency lasers and amplifiers are key components of interferometric gravitational wave detectors. One way to increase the detector sensitivity is to increase the power injected into the interferometers. We developed a fiber amplifier engineering prototype with a pump power limited output power of 200 W at 1064 nm. No signs of stimulated Brillouin scattering are observed at 200 W. At the maximum output power the polarization extinction ratio is above 19 dB and the fractional power in the fundamental transverse mode (TEM 00) was measured to be 94.8 %. In addition, measurements of the frequency noise, relative power noise, and relative pointing noise were performed and demonstrate excellent low noise properties over the entire output power slope. In the context of single-frequency fiber amplifiers, the measured relative pointing noise below 100 Hz and the higher order mode content is, to the best of our knowledge, at 200 W the lowest ever measured. A long-term test of more than 695 h demonstrated stable operation without beam quality degradation. It is also the longest single-frequency fiber amplifier operation at 200 W ever reported.

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Section: Introductionmentioning

confidence: 99%

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

et al. 2019

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“…Therefore, compact and robust laser or amplifier designs are required without long maintenance procedures. Fiber and fiber-based component technology can be a suitable alternative to overcome these limitations [5]. In the recent decade, several single-frequency fiber amplifiers have been developed and demonstrated further power scalability of such devices.…”

Section: Introductionmentioning

confidence: 99%

“…In 2008 Mermelstein et al presented 194 W output power [6], Zhu et al demonstrated up to 511 W output power [7] and in 2014 Pulford et al presented an output power level of 811 W [8]. In addition to a very high output power level fiber amplifiers also enable to fulfill GWD requirements regarding low noise levels and exceptional beam quality with a fundamental mode content above 90% [5]. Besides, a sufficient heat distribution is supported by the fundamental properties of the fibers, which allow for compact fiber amplifiers with simple operation and maintenance.…”

Section: Introductionmentioning

confidence: 99%

Single-Frequency 336 W Spliceless All-Fiber Amplifier Based on a Chirally-Coupled-Core Fiber for the Next Generation of Gravitational Wave Detectors

Hochheim

Brockmüller

Weßels

et al. 2022

J. Lightwave Technol.

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Specialty fibers such as chirally-coupled-core fibers show a high potential for further power scaling of singlefrequency fiber amplifiers. For the first time, we demonstrate a spliceless all-fiber amplifier, where all optical components are directly integrated in a single Yb 3+ -doped 3C ® -fiber. Such a spliceless laser design enables a compact and robust architecture using specialty fibers, while maintaining excellent beam properties. At an output power of 336 W operating at 1064 nm, a fundamental mode content of 90.4% at a polarization extinction ratio above 13 dB was measured without any impact of transverse mode instabilities or other parasitic effects. This work emphasizes the field of applications of 3C ® -fibers in high-power laser systems.

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“…In addition to contributing to a much larger overall component size, weight, power consumption (noting that such coolers are not especially efficient), and cost, they introduce mechanical vibrations, which in many circumstances lead to laser frequency and amplitude noise. For example, this noise is particularly damaging for advanced metrology, such as fiber sensors 14 and gravity‐wave detectors, 15 both requiring ultralow laser intensity noise and ultrastable frequency outputs.…”

Section: Introductionmentioning

confidence: 99%

The uniqueness of glass for passive thermal management for optical fibers

Ballato

Dragic

2021

Int J of Appl Glass Sci

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Optical fiber-based lasers and amplifiers are ubiquitous tools across many practical applications including communications, metrology, sensing, manufacturing, machining, and directed energy. Even for the most efficient cases where only a few percent of the optical power is converted into heat, this heat generation can have wide-ranging detrimental effects on overall system performance. In homage to the 2022 International Year of Glass, this paper provides a new look into the enabling roles that glass can play in the fully passive thermal management of active fiber lasers and amplifiers. Partially didactic, complemented with new insights and novel approaches and results, specific topics include means by which glass compositions can reduce the amount of heat generated by an active dopant and how the glass' response to heat generation, for example, thermooptic and thermal expansion coefficients, can be minimized or otherwise used to largely mitigate parasitic thermal effects.

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Single-Frequency Fiber Amplifiers for Next-Generation Gravitational Wave Detectors

Cited by 51 publications

References 68 publications

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

Single-Frequency 336 W Spliceless All-Fiber Amplifier Based on a Chirally-Coupled-Core Fiber for the Next Generation of Gravitational Wave Detectors

The uniqueness of glass for passive thermal management for optical fibers

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