Intracavity generation of low-loss radial-order Laguerre-Gaussian modes using digital holograms

Bell, Teboho; Aı̈t-Ameur, Kamel; Forbes, Andrew; Ngcobo, Sandile

doi:10.1117/12.2199421

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…However, doing that introduces supplementary losses and consequently increases the laser threshold. In this article we will show that it is possible to force the fundamental mode of the laser to be a single high-order LG p mode by using incomplete absorbing rings, allowing the reduction of inserting losses [13,14]. It is worthwhile recalling that an LG p beam is made up of a central peak surrounded by p-rings of light separated by a p-zeros of intensity.…”

Section: Introductionmentioning

confidence: 99%

Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Bell¹,

Hasnaoui²,

Aı̈t-Ameur³

et al. 2017

J. Opt.

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In this paper we experimentally demonstrate selective excitation of high-radial-order Laguerre–Gaussian (LGp or LG ) modes with radial order p = 1–4 and azimuthal order l = 0 using a diode-pump solid-state laser (DPSSL) that is digitally controlled by a spatial light modulator (SLM). We encoded an amplitude mask containing p-absorbing rings, of various incompleteness (segmented) on grey-scale computer-generated digital holograms, and displayed them on an SLM which acted as an end mirror of the diode-pumped solid-state digital laser. The various incomplete (α) p-absorbing rings were digitally encoded to match the zero-intensity nulls of the desired LGp mode. We show that the creation of LGp, for p = 1 to p = 4, only requires an incomplete circular p-absorbing ring that has a completeness of ≈37.5%, giving the DPSSL resonator a lower pump threshold power while maintaining the same laser characteristics (such as beam propagation properties).

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Section: Introductionmentioning

confidence: 99%

Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Bell¹,

Hasnaoui²,

Aı̈t-Ameur³

et al. 2017

J. Opt.

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show abstract

“…Though vector modes can routinely be produced with beam shaping techniques involving dynamic and geometric phase manipulations, inside and outside laser cavities. [12][13][14] It has become common standard to measure the state of the vector beam by observing the behaviour of the intensity pattern through a rotating polarizer; as the polarizer rotates, the intensity pattern observed varies. Based on the variation of the observed pattern, one then infers whether the beam under investigation is a vector or a scalar beam.…”

Section: Introductionmentioning

confidence: 99%

Vector quality measure for vector beams

et al. 2016

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Vector beams are spatial modes of light with spatially variant polarization states in the transverse profile. Over the years, vector beams have found their way into plenty of applications ranging from material processing and lithography to electron acceleration and particle trapping. Though qualitative measurements are routinely used to analyse vector beams, there is currently no quantitative measure for vector beam purity. Here, we introduce a new measure, the vector quality factor (VQF), that maps the purity of vector beams to a scale ranging from 0 to 1. We demonstrate a simple optical setup to generate and detect vector beams using a birefringent phase plate known as a q-plate. Tomographic measurements are performed by decomposing the vector beam into its circular basis states, and measuring the expectation values of the Pauli matrices as intensity measurements which, are used to evaluate the VQF of vector beams.

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Intracavity generation of low-loss radial-order Laguerre-Gaussian modes using digital holograms

Cited by 2 publications

References 19 publications

Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Vector quality measure for vector beams

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