Transverse mode control by manipulating gain distribution in a Yb:YAG ceramic thin disk

Shimohira, Koki; Kozawa, Yuichi; Sato, Shunichi

doi:10.1364/ol.36.004137

Cited by 9 publications

(10 citation statements)

References 8 publications

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“…32,35) Use of LG modes in a combina- tion with HG modes for particle trapping was discussed recently. 127) RP and AP high order LG vector modes have been actively studied due to their capability to generate a small focal spot, 71,73,128) which is attractive for many applications such as super-resolution microscopy or material nano-processing. Scalar LG p0 modes are of interest also due to the perspective of sharp focusing and applications in super-resolution techniques, for 3-D laser prototyping.…”

Section: Resultsmentioning

confidence: 99%

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Senatsky

Bisson

et al. 2012

OPT REV

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Over the last twenty years, diode pumping of solid-state lasers has opened new prospects for the mode control and formation of Laguerre-Gaussian (LG) beams, enabling a large variety of applications. Experiments on scalar and vector LG modes selection in Nd 3þ -and Yb 3þ -doped ceramics and crystal lasers carried out at the Institute for Laser Science, Tokyo are reviewed. Selection of LG modes from low to high orders using intra-cavity elements, polarization-selective mirrors, or shaping the pump beam profile, is considered. Illustrations of record-high-order LG hollow modes, multiring modes with highly directional propagation properties, characteristics of cw and pulsed lasers with radially or azimuthally polarized beams of high polarization purity are presented. General solutions of the wave equation for the axi-symmetric electric field, which describe LG beams of various profiles, are proposed for data analysis. In parallel, a short review on LG modes selection studies carried out at other laboratories is given.

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Section: Resultsmentioning

confidence: 99%

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Senatsky

Bisson

et al. 2012

OPT REV

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“…An advanced control of the modal power coefficients, e.g., by spatial gain shaping [28][29][30][31][32], as well as the identification and compensation of the effects causing the cavity internal modal dispersion are the next steps required to adapt transverse mode-locking for real life applications. With the corresponding improvements TML lasers have a great potential for applications requiring fast scanning laser beams, enabling spot resolving rates in the multi-GHz regime.…”

Section: Discussionmentioning

confidence: 99%

“…In analogy, in a TML laser the number of contributing modes compared to a Poisson distribution can be reduced due to an insufficient modulation strength of the AOM, i.e., resulting in an insufficient mode-locking force prohibiting the exploitation of the available gain bandwidth. Therefore, the number of contributing modes might be increased by using an AOM with improved modulation strength and by applying additional gain shaping methods [28][29][30][31][32], e.g., to tailor the spatial gain of the TML laser in favor of a Poissonian modal power distribution. However, so far the available gain shaping methods are either limited by the pump power that can be applied [28] or by the number of modes that can be excited [29][30][31][32].…”

Section: Time-averaged Intensity Distributionsmentioning

confidence: 99%

Modal reconstruction of transverse mode-locked laser beams

2020

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Transverse mode-locking in an end-pumped solid state laser by amplitude modulation with an acousto-optic modulator was investigated. Using the stochastic parallel gradient descent algorithm the modal power coefficients and the modal phases of the transverse mode-locked (TML) laser beam were reconstructed from the measured spatial and spatio-temporal intensity distributions, respectively. The distribution of the reconstructed modal power coefficients revealed that the average mode order of the transverse mode-locking process could be increased by a factor of about 8 compared to previous works, corresponding to an increase in the normalized oscillation amplitude by a factor of about 3. Furthermore, we found that besides a non-Poissonian modal power distribution, strong aberrations of the modal phases occurred in the experiment, resulting in a deformation of the oscillating spot. Additionally, we demonstrated the generation of up to four spots oscillating simultaneously on parallel traces by operating the TML laser on a higher mode order in the orthogonal direction to the transverse mode-locking process. TML lasers are of interest, e.g., for beam scanning purposes, as they have the potential to enable spot resolving rates in the multi-GHz regime.

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“…To generate the single target mode, the gain and loss can be controlled to provide TMD. Many researchers have paid enough attention to the gain control [16][17][18]. Here, to obtain all kinds of scalar modes, we focus on the loss δ mn [19].…”

Section: Mechanism Of Lg Modes Selectionmentioning

confidence: 99%

Numerical investigation on the generation of high-order Laguerre–Gaussian beams in end-pumped solid-state lasers by introducing loss control

Lei

Chen

et al. 2014

Appl. Opt.

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This paper reports a robust and systematic approach to generate high-order scalar Laguerre-Gaussian (LG_p,l) beams in end-pumped solid-state lasers by introducing loss control. Based on the spatial distributions of Laguerre-Gaussian modes and the theory of transverse mode selection, the "loss control" is implemented by an amplitude mask in the resonator. This proposed mechanism can be divided into three categories: radial loss, azimuthal loss, and the combination of radial and azimuthal loss, which correspond to excite radial high-order modes (LG_p,0), azimuthal high-order modes (LG_0,l), and regular high-order modes (LG_p,l), respectively. By controlling the locations and thicknesses of opaque rings and lines on the mask, all kinds of LG_p,l modes can be obtained. With the application of mode purity, all the generated modes possess high mode purities greater than 93% in simulation.

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Transverse mode control by manipulating gain distribution in a Yb:YAG ceramic thin disk

Cited by 9 publications

References 8 publications

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Modal reconstruction of transverse mode-locked laser beams

Numerical investigation on the generation of high-order Laguerre–Gaussian beams in end-pumped solid-state lasers by introducing loss control

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