Relaxation oscillation in Er^3+-doped and Yb^3+/Er^3+co-doped fiber grating lasers

Ma, Lei; Hu, Zhengliang; Liang, Xiaoyan; Zhang, Meng; Hu, Yongming

doi:10.1364/ao.49.001979

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…It is worth noting that the pulsing frequency has the same order as that of relaxation oscillations, − that is, 10 5 to 10 6 Hz . This correspondence is not a coincidence, because the increase in the pumping rate turns the laser from pulsed to CW generation. − This transition is performed through the increase in the pulsing rate, so that the pulses merge into a continuously oscillating curve.…”

Section: Resultsmentioning

confidence: 98%

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Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

et al. 2018

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A pulsed regime of short-cavity, heavily erbium-doped fiber lasers is of high interest for its possible applications in telecommunications and sensorics. Here, we demonstrate these lasers in two configurations, distributed feedback laser and compare it with a classic Fabry-Perot type laser. We have managed to create lasers that function stably with cavities as small as 50 mm. Pulse properties such as amplitude, frequency and duration, are in a good agreement with our theoretical analysis, which takes into account spontaneous emission. We report the observation of the thermal switching effect, which consists of the pulsing regime changing to CW upon cooling the laser cavities down to the liquid nitrogen temperature. We theoretically show that this effect may be explained by weakening of the up-conversion process responsible for the pulsed regime. The slowing of the up-conversion processes is due to the energy mismatch in this process, which is overcome by interaction with phonons. At low temperatures, the number of phonons decreases and pulsing switches off.Fiber lasers based on erbium-doped silica glass are actively used in modern fiber optics. [1][2][3][4][5] Erbium lasers operating at wavelengths near 1.5 μm are widely used in telecommunications, 6-10 optical sensing, 11-13 and radiophotonics. 14 ASSOCIATED CONTENT

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Section: Resultsmentioning

confidence: 98%

“…It is worth noting that the pulsing frequency has the same order as that of relaxation oscillations; [52][53][54][55][56] that is, 10 5 to 10 6 Hz. 54 This correspondence is not a coincidence, because the increase in the pumping rate turns the laser from pulsed to CW generation.…”

Section: Switching To the Cw Oscillation Regime With Coolingmentioning

confidence: 99%

Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

et al. 2018

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“…It is found that the increase of the RIN induced by the ASE is mainly distributed in the frequency range of 300 kHz-4 MHz, while at the other frequencies the ASE noise is negligible. This is expected, as the relaxation oscillation of the fiber laser is dominantly caused by the pump power fluctuation and the cavity loss fluctuation, while in the low frequency range the main noise sources are the pump intensity noise and other technical noise [14,15]. Beyond the relaxation oscillation, the modulation effect of the fluctuation of the pump power and the cavity loss on the laser intensity decreased.…”

Section: Resultsmentioning

confidence: 91%

The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm

Feng

et al. 2014

Laser Phys. Lett.

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A thorough investigation of the effect of amplified spontaneous emission (ASE) on the noise characteristics of a heavily Yb-doped phosphate fiber single-frequency laser at 1083 nm was made. Both the intensity noise and the frequency noise were measured and analyzed by introducing a band pass filter (BPF) into the fiber laser. For the intensity noise, it was found that the ASE noise is present at frequencies beyond the resonant relaxation oscillation (RRO) and until 6 MHz at low pump intensity, while it is diminished in the high power regime. Under a pump power of 42 mW, a maximum reduction of over 3 dB of the relative intensity noise (RIN) was observed with the help of the BPF. As for the frequency noise, a transition of the dominating noise sources from ASE noise in the low pump intensity condition to pump noise in the high pump intensity condition was observed. In the low power condition, more than 7 dB of the ASE noise was found to add to the frequency noise spectrum. It is believed that the obtained results will be helpful in understanding and optimizing the noise characteristics of this type of fiber laser.

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“…Samson et al [18] assume that relaxation oscillations may result from active-ion clustering. Ma et al [19] presented a theoretical description of relaxation oscillations using analysis of luminescence.…”

Section: Parameters Of the Laser And Its Componentsmentioning

confidence: 99%

Narrow-band erbium-doped fibre linear–ring laser

Kolegov¹,

Sofienko²,

Minashina³

et al. 2014

Quantum Electron.

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We have demonstrated a narrow-band linear -ring fibre laser with an output power of 15 mW at a wavelength of 1.55 mm and an emission bandwidth less than 5 kHz. The laser frequency is stabilised by an unpumped active fibre section and fibre Bragg grating. The fibre laser operates in a travelling wave mode, which allows the spatial hole burning effect to be avoided. At a certain pump power level, the laser switches from continuous mode to repetitivepulse operation, corresponding to relaxation oscillations.

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Relaxation oscillation in Er^3+-doped and Yb^3+/Er^3+co-doped fiber grating lasers

Cited by 10 publications

References 11 publications

Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm

Narrow-band erbium-doped fibre linear–ring laser

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Relaxation oscillation in Er^3+-doped and Yb^3+/Er^3+co-doped fiber grating lasers

Cited by 10 publications

References 11 publications

Thermal Switching of Lasing Regimes in Heavily Doped Er3+ Fiber Lasers

Thermal Switching of Lasing Regimes in Heavily Doped Er3+ Fiber Lasers

The ASE noise of a Yb3+-doped phosphate fiber single-frequency laser at 1083 nm

Narrow-band erbium-doped fibre linear–ring laser

Contact Info

Product

Resources

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Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

Thermal Switching of Lasing Regimes in Heavily Doped Er³⁺ Fiber Lasers

The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm