Multibeam-waist modes in an end-pumped Nd:YVO_4 laser

Chen, Ching Hsu; Tai, Po Tse; Hsieh, Wen‐Pin; Wei, Ming

doi:10.1364/josab.20.001220

Cited by 23 publications

(28 citation statements)

References 12 publications

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“…Furthermore, one can notice that many experimental and numerical LG and IG modes [7,12,13] are found only at specific lengths of the cavity corresponding to partial degeneracy. Since cavity degeneracy has already been shown to have a strong influence on the emitted mode profile, leading for instance to unusual geometric modes [14][15][16], one may question the role of cavity degeneracy in the selection of LG or IG modes. In this Letter, we show that high-order mode excitation is in general not governed by the pump profile only and that it strongly relies on degeneracy effects.…”

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confidence: 99%

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Role of cavity degeneracy for high-order mode excitation in end-pumped solid-state lasers

2014

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The possibility of exciting laser modes such as Laguerre-Gaussian (LG) or Ince-Gaussian (IG) modes is discussed on the basis of a gain-matching integral. We reach the conclusion that, using tight pumping and away from degeneracy regions, only the IG(n,n)(e) modes can be excited. Furthermore, pure high-order modes with circular or elliptical nodal lines can never be excited. Only an approximation of such modes, which we call quasi-IG or quasi-LG modes, can be observed and only when the cavity is partially degenerate. We provide experimental results in perfect agreement with the theory and discuss the exact nature of the profiles observed at degeneracy in our experiments and elsewhere in the literature.

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confidence: 99%

“…4 as a function ofL. Remarkably, the correlation presents some minima at exact degeneracy lengths of the cold cavity, where geometric modes are observed [14][15][16]. It is worthwhile to note that decreasing the pump size leads to an exaltation of the effect of degeneracy, in both situations of on-axis and off-axis pumping.…”

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confidence: 99%

Role of cavity degeneracy for high-order mode excitation in end-pumped solid-state lasers

2014

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“…Mention should be made of a number of experimental and theoretical works devoted to "MP modes" [10][11][12][13][14]. The experiments produced specific conditions for excitation in these modes.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of mode formation in an open resonator

Niziev

Grishaev

2010

Appl. Opt.

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We developed an iteration algorithm for open resonator simulation and employed it in studying the dynamics of mode formation. Simulations of an axially symmetrical empty resonator rely on an analytical description of radiation diffraction from a narrow ring. Reflection of an incident wave with a specified amplitude-phase distribution from the mirror is calculated by the Green function method. The process of mode formation is characterized by relaxation oscillations of various frequencies depending on the resonator parameters. The evolution of the relaxation oscillation amplitude can be aperiodic in nature, or it can occur as beats of a different frequency. It has been shown that there is a consistency between the known conditions of paraxial resonance obtained in the approximation of geometric optics and the aperiodic processes of evolution of relaxation oscillation amplitude in mode forming. An investigation has been performed on the factors affecting the time of mode formation. The possibility has been shown for multipass mode suppression and TEM 10 mode generation by the use of an absorber mask on the resonator mirror.

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“…To obtain the HLBs, several methods have been suggested. [3][4][5][6][7][8][9][10][11][12] These methods can be divided into two classes. The first class is based on transformation of existing beams, such as those from spatial light modulators, 3,4 4 focusing system, 5 and computergenerated holograms.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the energy of the beams is largely lost. In the second class, the HLBs are produced directly from a bare laser, e.g., an end-pumped Nd: YVO 4 laser as proposed by Chen et al 10,11 However, the cost of the crystal of Nd: YVO 4 and the laser diode pump is too high. It has been reported that an axicon was used as a total reflector for a CO 2 laser resonator to obtain high-order circular modes.…”

Section: Introductionmentioning

confidence: 99%

Proposal to obtain a hollow laser beam from a hollow cone-shaped resonator

Liu

Chen

et al. 2007

Opt. Eng

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A CO 2 laser with a hollow cone-shaped resonator ͑HCR͒ for producing a hollow laser beam ͑HLB͒ is proposed. The HCR consists of a totally reflective mirror and a partially reflective mirror at the two ends of a hollow cone-shaped discharge tube. In a longitudinal section of the HCR along its axis of symmetry it can be regarded as a folded cavity. Employing an standard optical system, the HLBs can be focused to meet the requirements of various applications. Analysis shows that not only can an HLB be obtained, but also the radius of the dark region of the focused HLB is easy to adjust. The hollow cone-shaped CO 2 laser may be used as a new type of optical tweezers.

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Multibeam-waist modes in an end-pumped Nd:YVO_4 laser

Cited by 23 publications

References 12 publications

Role of cavity degeneracy for high-order mode excitation in end-pumped solid-state lasers

Role of cavity degeneracy for high-order mode excitation in end-pumped solid-state lasers

Dynamics of mode formation in an open resonator

Proposal to obtain a hollow laser beam from a hollow cone-shaped resonator

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