Tunable acousto-optic filters with the multiple interaction of light and sound

Voloshinov, V. B.; Magdich, L. N.; Knyazev, G. A.

doi:10.1070/qe2005v035n11abeh013035

Cited by 11 publications

(2 citation statements)

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“…After removal of the IR part of the supercontinuum spectrum using a 760 nm short pass filter, the desired excitation wavelength is selected using an acousto-optical tunable filter (AOTF, PCAOM-VIS, Crystal Technologies, Palo Alto, USA). The beam passes the AOTF three times in order to suppress the undesired wavelength range of the supercontinuum spectrum; the triple pass suppresses 1000 times better than a regular single pass (see Figure A1) [13]. The STED laser is a frequency-doubled pulsed fiber laser (PFL1-1000-775, MPB Communications, Montreal, Canada) providing 1 ns pulses of up to 30 nJ pulse energy at a wavelength of 775 nm.…”

Section: Methodsmentioning

confidence: 99%

A STED MICROSCOPE DESIGNED FOR ROUTINE BIOMEDICAL APPLICATIONS (Invited Paper)

Görlitz¹,

Hoyer²,

Falk³

et al. 2014

PIER

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Section: Methodsmentioning

confidence: 99%

A STED MICROSCOPE DESIGNED FOR ROUTINE BIOMEDICAL APPLICATIONS (Invited Paper)

Görlitz¹,

Hoyer²,

Falk³

et al. 2014

PIER

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“…Particularly, due to their prominent spectral re-configurability by respectively controlling the amplitude and frequency of the applied radiation frequency (RF) signal for acoustic wave generation, all-fiber acousto-optic tunable filters (AOTFs) based on acoustically induced LPGs have attracted considerable research interest in such dynamically evergrowing fields as optical communications [4,5], optical fiber sensing applications [6,7], optical fiber lasers [8], and even slow and fast light control implementations [9]. Factually, besides the acoustically induced long-period fiber gratings, the interaction between light and sound in bulk media has also been extensively investigated and many related AOTFs have been developed in the past few years [10][11][12]. And owing to their distinguished properties such as compact size, ease of fabrication and flexibility of acoustically controlled optical processes, besides the applications as single optical elements, fiber-based AOTFs have also been applied in mode coupling process control in various fiber-optic components, such as LPGs [13], fiber Bragg gratings (FBGs) [14], tilted fiber Bragg gratings (TFBGs) [15], tapered fiber structures [16], etc.…”

Section: Introductionmentioning

confidence: 99%

Spectral characteristics of single-mode-fiber-based cascaded acousto-optic filters

Dong

Zhang

Miao

et al. 2013

J. Opt.

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In this paper, two cascaded single-mode-fiber-based acousto-optic fiber grating schemes have been proposed and a comparative study on their spectral characteristics has been performed. By serially employing two acoustic transducers with the same geometrical and physical settings, a cascaded configuration of acousto-optic fiber gratings has been established. Experimental results indicate that the mode coupling efficiency has been improved due to the presence of the acoustic transducers in a serial configuration. Moreover, another cascaded acousto-optic tunable filter scheme is implemented based on a reflection configuration, in which an acousto-optic tunable filter is employed with a thin silver film coated at the fiber end as an efficient reflector for both of the core and cladding modes. And, moreover, spectral fringes resulting from the intermodal interference between the fundamental core mode and cladding modes have been experimentally observed, which is basically in accordance with our theoretical simulation result. Further theoretical investigation of its transmission spectral response to the acousto-optical coupling coefficient reveals the possibility to control the interference spectrum through adjusting the acousto-optic coupling strength of a single acoustic fiber grating, which is an important feature for the acoustic-grating-based fiber interferometers to be used in practical applications.

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Tunable semiconductor laser with two acousto-optic tunable filters in its external cavity

Magdich

Chamorovskiy²,

Shidlovsky

et al. 2020

Quantum Electron.

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We report a laser with a linear external cavity containing a near-IR injection semiconductor optical amplifier as a gain element and two acousto-optic tunable filters (AOTFs) with quasi-collinear interaction of acoustic and light waves. At identical frequencies of RF signals that control the filters and ensure compensation for the Doppler frequency shift of light passing through the AOTFs, the steady-state laser emission linewidth can be reduced to about 25 MHz, which is almost three orders of magnitude smaller than that in the case of one filter (20 GHz). The position of the emission line, which remains narrow, slowly fluctuates within a spectral range about 3 GHz wide, which seems to be due to the large length of the external cavity and insufficient thermal stabilization of its components. This does not prevent us from obtaining light with a large coherence length. In emission wavelength sweep mode, the instantaneous emission linewidth increases with tuning rate, reaching 0.022 nm (8.8 GHz) at the highest tuning rate: 104 nm s−1. In the case of automatic control over the output optical power at a level of 3 mW, the tuning range is 815 – 875 nm. Such instruments are of practical interest for optical coherence tomography, spectroscopy, optical metrology, and other application areas.

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Tunable acousto-optic filters with the multiple interaction of light and sound

Cited by 11 publications

References 0 publications

A STED MICROSCOPE DESIGNED FOR ROUTINE BIOMEDICAL APPLICATIONS (Invited Paper)

A STED MICROSCOPE DESIGNED FOR ROUTINE BIOMEDICAL APPLICATIONS (Invited Paper)

Spectral characteristics of single-mode-fiber-based cascaded acousto-optic filters

Tunable semiconductor laser with two acousto-optic tunable filters in its external cavity

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