Independent phase and amplitude control of a laser beam by use of a single-phase-only spatial light modulator

Bagnoud, V.; Zuegel, J. D.

doi:10.1364/ol.29.000295

Cited by 117 publications

(63 citation statements)

References 6 publications

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“…This method is, thereby, less costly, offer a much higher diffraction efficiency (we estimated a 10 times higher efficiency), which is relevant when working with single photon sources, and does not require an optical system for projecting the image of a SLM onto a second one in order to obtain the complex modulation. Among the different techniques to represent a complex function in a single SLM [14][15][16] our method follows the proposals of [17,18] for encoding amplitude and phase information onto a phase-only SLM. To this end, phase diffraction gratings were displayed in those zones corresponding to the slits.…”

Section: Introductionmentioning

confidence: 99%

Optimized generation of spatial qudits by using a pure phase spatial light modulator

Varga¹,

Rebón²,

Solís-Prosser³

et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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Abstract:We present a method for preparing arbitrary pure states of spatial qudits, namely, D-dimensional (D ≥ 2) quantum systems carrying information in the transverse momentum and position of single photons. For this purpose, a set of D slits with complex transmission are displayed on a spatial light modulator (SLM). In a recent work we have shown a method that requires a single phase-only SLM to control independently the complex coefficients which define the quantum state of dimension D. The amplitude information was codified by introducing phase gratings inside each slit and the phase value of the complex transmission was added to the phase gratings. After a spatial filtering process we obtained in the image plane the desired qudit state. Although this method has proven to be a good alternative to compact the previously reported architectures, it presents some features that could be improved. In this paper we present an alternative scheme to codify the required phase values that minimizes the effects of temporal phase fluctuations associated to the SLM where the codification is carried on. In this scheme the amplitudes are set by appropriate phase gratings addressed at the SLM while the relative phases are obtained by a lateral displacement of these phase gratings. We show that this method improves the quality of the prepared state and provides very high fidelities of preparation for any state. An additional advantage of this scheme is that a complete 2π modulation is obtained by shifting the grating by one period, and hence the encoding is not limited by the phase modulation range achieved by the SLM. Numerical simulations, that take into account the phase fluctuations, show high fidelities for thousands of qubit states covering the whole Bloch sphere surface. Similar analysis are performed for qudits with D = 3 and D = 7.

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Section: Introductionmentioning

confidence: 99%

Optimized generation of spatial qudits by using a pure phase spatial light modulator

Varga¹,

Rebón²,

Solís-Prosser³

et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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“…This requirement naturally invokes the use of liquid-crystal SLMs, which, working in a pixilated form, are the most prominent building blocks of many of today's state-of-the-art electro-optical systems. However, a commercial SLM usually afford one modulation parameter (phase or amplitude, depending on its modulation mode) [18][19][20]. A means to overcome this issue is to employ the diffraction property of the SLM, as outlined below.…”

Section: Principlementioning

confidence: 99%

Simultaneous tailoring of complete polarization, amplitude and phase of vector beams

Chen

et al. 2015

Optics Communications

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“…Furthermore, unlike other phase-only beam shaping techniques mentioned, GPC works on a 4f imaging geometry, hence avoiding wavelength dependent scaling of the output which makes it a good candidate for shaping composite multi-wavelength or supercontinuum lasers [24]. The 4f geometry can accommodate different filters in the Fourier plane and different 4f beam shaping systems have also been proposed by others [25][26][27]. Among these, GPC is unique in shaping light using a direct phase to intensity mapping.…”

Section: Generalized Phase Contrastmentioning

confidence: 99%

GPC light shaping a supercontinuum source

Kopylov¹,

Bañas²,

Villangca³

et al. 2015

Opt. Express

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Generalized Phase Contrast (GPC) is a versatile tool for efficiently rerouting and managing photon energy into speckle-free contiguous spatial light distributions. We have previously shown theoretically and numerically that a GPC Light Shaper shows robustness to shift in wavelength and can maintain both projection length scale and high efficiency over a range [0.75λ 0 ; 1.5λ 0 ] with λ 0 as the characteristic design wavelength. With this performance across multiple wavelengths and the recent availability of tabletop supercontinuum lasers, GPC light shaping opens the possibility for creatively incorporating various multi-wavelength approaches into spatially shaped excitations that can enable new broadband light applications. We verify this new approach using a supercontinuum light source, interfaced with a compact GPC light shaper. Our experiments give ~70% efficiency, ~3x intensity gain, and ~85% energy savings, limited, however, by the illumination equipment, but still in very good agreement with theoretical and numerical predictions. 974-978 (1999).

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Independent phase and amplitude control of a laser beam by use of a single-phase-only spatial light modulator

Cited by 117 publications

References 6 publications

Optimized generation of spatial qudits by using a pure phase spatial light modulator

Optimized generation of spatial qudits by using a pure phase spatial light modulator

Simultaneous tailoring of complete polarization, amplitude and phase of vector beams

GPC light shaping a supercontinuum source

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