Acoustooptic attenuation filters based on tapered optical fibers

Feced, R.; Alegria, C.; Zervas, M.N.; Laming, R.I.

doi:10.1109/2944.806753

Cited by 58 publications

(31 citation statements)

References 18 publications

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“…where n 0 is the silica refractive index, S z is the induced longitudinal strain [14] and χ is the elasto-optic coefficient, which has the value of 0.22 for silica [14].…”

Section: Theory: Principles Of Null Coupler Switchmentioning

confidence: 99%

“…where f is the frequency of the acoustic wave, R is the fiber radius and C ext is the extensional wave speed (5760 m/s in silica [14] ). The dielectric permittivity perturbation along the fiber as a result of the induced acoustic wave is given by [14]:…”

Section: Theory: Principles Of Null Coupler Switchmentioning

confidence: 99%

“…The dielectric permittivity perturbation along the fiber as a result of the induced acoustic wave is given by [14]:…”

Section: Theory: Principles Of Null Coupler Switchmentioning

confidence: 99%

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A robust all-fiber active Q-switched 1-µm Yb3+ fiber laser

et al. 2015

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traditional bulk lasers in their compactness, lightweight, high efficiency, beam stability and low price.However, most of the Q-switched fiber lasers are based on a master oscillator power amplifier (MOPA), which is composed of a Q-switched oscillator and a subsequent fiber amplifier; both are mainly based on Yb 3+ -doped fibers.One of the main obstacles in increasing the robustness and reducing the price of pulsed fiber lasers is the Q-switch element, embedded in the fiber laser oscillator. This element is usually a free space-based acousto-optic or electro-optic modulator. In case of an acousto-optic modulator (AOM) [1], the device requires high-power radio frequency (RF) sources and an optical bench for holding the free space optical elements in front of the oscillator's fiber tips, in order to allow efficient optical coupling between the fiber oscillator and the free space AO deflector. In case of an electro-optic modulator (EOM) [2], the same holding and optical coupling requirements apply, as in the AOM case. In addition, high voltage in the order of several kilovolts is required for operating the EOM, which poses additional isolation and safety requirements.During the last two decades, all-fiber Q-switched fiber lasers were demonstrated using an acoustically modulated long-period fiber grating attenuator [3,4], Bragg mirrors modulation [5, 6], stress-induced polarization modulation [7-9] and passive all-fiber saturable absorber [10]. However, presently available 1-µm Q-switched fiber lasers do not benefit from these technologies due to various reasons, among which are the stability of the components over time, their robustness and suitability to the 1-µm wavelength range.Another technique for Q-switching of 1.55-µm fiber lasers has been presented by Berg et al. [11]. This technique makes use of a null coupler incorporated into a ring Yb:Er fiber laser. The idea of incorporating null coupler for inducing an acoustic long-period grating (LPG) inside a ring Abstract An all-fiber active Q-switched Yb 3+ -doped fiber laser at 1 µm is presented. The laser is composed of a ring resonator with an embedded all-fiber Q-switch element, based on a null coupler with an attached piezoelectric transducer (PZT). The PZT is used as an acoustic actuator, for inducing longitudinal acoustic disturbance along the null coupler and causing light coupling between the null coupler's ports. A stable operation is achieved with an overall average output power of up to 275 mW at various pulse repetition rates (PRR), ranging from 10 to 35 kHz and typical pulse energy of 15 μJ. In addition, a self-monitoring method is implemented by an embedded microcontroller, in order to maintain stable Q-switch performance, in changing environmental conditions. An average power of 8.5 W and pulse energy of 420 μJ at a PRR of 20 kHz are demonstrated in a master oscillator power amplifier containing the Q-switched laser, followed by a power amplifier.

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“…where n 0 is the silica refractive index, S z is the induced longitudinal strain [14] and χ is the elasto-optic coefficient, which has the value of 0.22 for silica [14].…”

Section: Theory: Principles Of Null Coupler Switchmentioning

confidence: 99%

Section: Theory: Principles Of Null Coupler Switchmentioning

confidence: 99%

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A robust all-fiber active Q-switched 1-µm Yb3+ fiber laser

et al. 2015

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“…In general, the gain profile of an EDFA can be flattened by changing the glass host material [1][2][3], and hybrid fiber configurations [4,5], or by using optical filters to compensate for the variations in the gain spectrum [6][7][8][9][10][11][12]. Various kinds of optical filters have been demonstrated for this application, including long-period fiber gratings [6,7], fiber Bragg gratings [8], fiber acousto-optic tunable filters [9,10], Mach-Zehnder filters [11], and so on.…”

Section: Introductionmentioning

confidence: 99%

Wide band gain flattening Yb3+-doped fiber amplifier

Kong¹,

Deng²,

Ma³

et al. 2011

Optics Communications

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“…The propagation constants are assumed to depend on z to account for axial non-uniformities, and the angular frequencies satisfy ω 01 = ω 11 + Ω a . The mode field evolves according to the coupled mode equations [27] …”

Section: Methods 1: Stationary Acoustooptic Interaction Regionmentioning

confidence: 99%

Acoustooptic Characterization of a Birefringent Two-Mode Photonic Crystal Fiber

Haakestad

Engan

2006

Optical Fiber Sensors

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Abstract:The effect of axial variations in acoustooptic phase-mismatch coefficient of a two-mode birefringent photonic crystal fiber (PCF) is studied experimentally using two different methods. The first method is to determine axial non-uniformities directly from the transmission spectrum, while the second method is to use acoustic pulses. Both methods are seen to be in good agreement. It is found that axial non-uniformities increase the coupling bandwidth significantly as compared to an axially uniform fiber. The effect of acoustic birefringence is also considered.

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Acoustooptic attenuation filters based on tapered optical fibers

Cited by 58 publications

References 18 publications

A robust all-fiber active Q-switched 1-µm Yb3+ fiber laser

A robust all-fiber active Q-switched 1-µm Yb3+ fiber laser

Wide band gain flattening Yb3+-doped fiber amplifier

Acoustooptic Characterization of a Birefringent Two-Mode Photonic Crystal Fiber

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