Photodarkening in ytterbium-doped silica fibers

Koponen, Jorma; Söderlund, Mikko; Tammela, Simo; Po, Hong

doi:10.1117/12.630499

Cited by 70 publications

(92 citation statements)

References 8 publications

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“…On the other hand, in the experiments no residual pump changes (increases) were observed at Port 1, even when an axial tension was put on the YDF near its pump input end in the experiments, which eliminates the possibility that the pump may introduce any self-writing fiber grating effect on the YDF. Therefore, the power conversion efficiency decreases with the pump time for the laser should result from the photodarkening effect of the YDF, i.e., the action of pump radiation (including the lasing generated and the ASE) makes the YDF get a permanent and unrecoverable damage, which may be caused by the highenergy photons, or multi-photon absorption of the pump and the stimulated light emission [11]. In fact, all the experimental phenomena for the fiber laser can be explained by the photodarkening effect.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, photodarkening was reported for many rare-earth doped glasses, such as thulium, praseodymium, cerium, and europium [9], suggesting that the photodarkening may exist in silica-based doped fibers. In fact, infrared-induced photodarkening has been found in Tm-doped fluoride fibers [10], and also in highly doping YDFs most recently [11].…”

Section: Introductionmentioning

confidence: 99%

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Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

Mao¹,

Zhu²,

Liu³

et al. 2006

Micro & Optical Tech Letters

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sized ground-planes/laminates nor the connector. The gain was measured across the band and increased from 6.3 to 7.3 dBi. These results are consistent with the antenna presented in Ref. [2] and are slightly lower than the predicted gains of 6.8 to 8.7 dBi; however, the impact of the small ground-plane used and the associated increase in cross-polarization levels and backward directed radiation evident in Figure 3 can easily account for this discrepancy. CONCLUSIONSA technique that can potentially reduce the cost of an MMIC compatible printed antenna by reducing the amount of high dielectric constant material necessary to realize an efficient antenna has been presented. It was found that a thin layer of low cost, moderate dielectric constant laminate between the MMIC layer, and the first patch of a stacked configuration can still produce an efficient, broadband radiator. INFLUENCES OF PHOTODARKENING IN HIGHLY DOPING YTTERBIUM-DOPED FIBER ON PERFORMANCE OF FIBER LASER

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

Mao¹,

Zhu²,

Liu³

et al. 2006

Micro & Optical Tech Letters

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“…Finally notice that the SQS regime is stable in YFL if the active YF properties are not seriously deteriorated in time-domain because of the photo-darkening effect [22,23]. Otherwise, as our experiments show, after shorttime (minutes) functioning, the YFL threshold rapidly increases, and finally the laser stops to oscillate at all.…”

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confidence: 87%

Self-Q-switched Ytterbium-doped all-fiber laser

Kir’yanov

Barmenkov

2006

Laser Phys. Lett.

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Abstract:We report an experimental realization and study of a self-Q-switched diode-pumped all-fiber Ytterbium laser. Possible mechanisms leading to establishing of self-Q-switching in the laser are discussed. Pulsed Ytterbium-doped fiber lasers operating near 1 µm are currently of increased interest as the devices potentially applicable in different areas of technology, medicine, basic research, etc. Rather than mode-locked Ytterbium fiber lasers generating ultra-short pulses (of femto-or pico-second duration), Q-switched Ytterbium fiber lasers oscillate normally pulses of nano-or submicrosecond duration ("giant pulses"). Usually the giant-pulse regimes can be realized in Ytterbium fiber lasers applying the Q-switching techniques conventional for bulk lasers, using as Q-switches acousto-or electro-optical elements, or solid-state saturable absorbers [1][2][3][4][5]. Apparently, the integrated fiber-bulk architecture of such laser schemes is a disadvantage in majority of applications. That is why implementation of Q-switched all-fiber Ytterbium lasers generating stable and powerful short pulses becomes an important point of current researches. To date, only a couple of actively Q-switched all-fiber Ytterbium laser designs have been proposed [6,7]. Meanwhile, the Q-switching arrangements in these lasers are complicate and expensive: As in all actively Q-switched lasers, additional electronic and optical circuits are needed to be incorporated in a laser scheme. So, more attention is paid now to develop passively Q-switched Ytterbium all-fiber lasers as an alternative to the actively Q-switched ones. The passive Qswitching methods to realize such lasers [8][9][10][11] have obvious potential advantages -the simplicity of implementation, low cost, and insensitivity to the environmental influences. However, there are also very few designs for passively Q-switched all-fiber Ytterbium lasers. Virtually in all these lasers the Brillouin or Raman scattering are exploited as the switching mechanisms [8][9][10]. The main drawback of the mentioned lasers is their quite instable operation that seems to stem from the stochastic nature of the Q-switching nonlinear scatterings, while giant pulses generated are quite short (nanoseconds) and powerful. An-

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“…One of the reasons must be that they present higher transition cross-sections around the 1-µm region compared to those of YDFs based on other host materials like phosphosilicate [14][15][16] as well as offering relatively low refractive core indices [1]. However, a main problem with Al-based YDFs is their vulnerability to PD [8][9][10][11][16][17][18], particularly in fibers of high doping concentrations of Yb 3+ ions [18]. Therefore, other types of YDFs have been considered as a replacement for Al-based YDFs [ 15,19,20].…”

Section: Introductionmentioning

confidence: 99%

Comparative Experimental Analysis of Thermal Characteristics of Ytterbium-Doped Phosphosilicate and Aluminosilicate Fibers

Lee

Vazquez-Zuniga

Lee

et al. 2013

Journal of the Optical Society of Korea

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We present a comparative experimental analysis of the thermal spectroscopic characteristics of a phosphosilicate (P)-based ytterbium-doped fiber (YDF) against an aluminosilicate (Al)-based YDF in the temperature range of 25 to 150ºC. We also characterize the fibers as gain media in a cladding-pumped amplifier configuration. While both fibers exhibit comparable trends in their thermal characteristics, there are noticeable distinctions in the fluorescence lifetime reduction rate and the spectral dependence of the transition cross-sections. The P-and Al-based YDFs present thermal lifetime reduction rates of 0.012%/ºC and 0.026%/ºC, respectively. In particular, in the spectral region at ~940 nm, the absorption cross-section of the P-based YDF undergoes significantly less thermal change compared to that of the Al-YDF. In the cladding-pumped amplifier configuration operating at a total gain of 10 dB, the Al-based YDF generally performs betters than the P-based YDF in the temperature range of 25 to 75ºC. However, it is highlighted that in the high temperature range of over 75ºC, the latter shows a less gain reduction rate than the former, thereby yielding higher relative output power by 3.3% for a 1060-nm signal, for example.

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Photodarkening in ytterbium-doped silica fibers

Cited by 70 publications

References 8 publications

Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

Influences of photodarkening in highly doping ytterbium‐doped fiber on performance of fiber laser

Self-Q-switched Ytterbium-doped all-fiber laser

Comparative Experimental Analysis of Thermal Characteristics of Ytterbium-Doped Phosphosilicate and Aluminosilicate Fibers

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