Compact Laser with Radial Polarization Using Birefringent Laser Medium

Yonezawa, Kazuhiro; Kozawa, Yuichi; Sato, Shunichi

doi:10.1143/jjap.46.5160

Cited by 43 publications

(15 citation statements)

References 21 publications

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“…The widths (%1 mm) of experimental HR and OC regions, where AP or RP doughnuts oscillated, are correlated to the birefringent shift of lens foci, D ¼ ð f e Þ ax À ð f o Þ ax % 1 mm for 1 cm YVO 4 plate. 70) In case of -BBO crystal (refraction indices n e ¼ 1:58462, n o ¼ 1:65790) the mode selective mechanism considered above must be obviously reversed. RP doughnut mode selection should take place at F configuration and AP doughnut selection -at I configuration, as was observed.…”

Section: Lg Vector Modes Selectionmentioning

confidence: 99%

“…65) Recently, uniaxial crystals having axially symmetric birefringence (undoped and Nd 3þ -doped c-cut YVO 4 , GdVO 4 , -BBO) for AP/RP modes selection have come back in several works with DPSSLs. 66,70,71,82,90) These schemes exploited double refraction to discriminate one of the two orthogonal polarizations (RP or AP) by inducing higher losses to either the extraordinary (e) rays (for TM-type modes) or to the ordinary (o) rays (for TE-type modes), which propagate along different trajectories inside the resonator. A combination of a Brewster-angle axicon and c-cut Nd:YVO 4 crystal inside a resonator made it possible to produce RP offaxis oscillations distributed on a thin ring or an arc.…”

Section: Lg Vector Modes Selectionmentioning

confidence: 99%

“…66,70) RP doughnut and higher order RP modes were produced using an undoped c-cut YVO 4 in the Nd:YAG laser hemispherical cavity.…”

Section: Lg Vector Modes Selectionmentioning

confidence: 99%

“…23,24) RP and AP doughnuts and highorder LG vector modes have been actively studied for their capability to generate a strong longitudinal electric field when it is tightly focused and a focal spot smaller than that for a linearly polarized beam. 72,74,76) Methods of cv modes selection in a laser are distinguished usually by the usage of axisymmetric-polarization-selective components: birefringent crystals, 57,66,70,71) Brewster angle conical elements, 58,65) polarization selective mirrors. 24,62,64,68,[72][73][74] Methods of RP and AP modes formation inside and outside the laser cavity and their applications were reviewed by Zhan.…”

Section: Introductionmentioning

confidence: 99%

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

Senatsky

Bisson

et al. 2012

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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: Lg Vector Modes Selectionmentioning

confidence: 99%

Section: Lg Vector Modes Selectionmentioning

confidence: 99%

“…66,70) RP doughnut and higher order RP modes were produced using an undoped c-cut YVO 4 in the Nd:YAG laser hemispherical cavity.…”

Section: Lg Vector Modes Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Senatsky

Bisson

et al. 2012

OPT REV

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“…It is well-known the usage of anisotrophic elements to convert beams with the homogeneous polarization into cylindrical vector beams [1][2][3][4][5][6]. At the same time, it is necessary to implement the separation of the longitudinal modes along the optical axis of the system, which is parallel to the axis of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Experimantal oberving of transformation Bessel beam spreading along axis of crystal during wavelength changes

Vasilev¹,

Подлипнов²

2017

Collection of Selected Papers of the III International Conference on Information Technology and Nanotechnology

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In paper decribe experimental observing transform bessel beam, formed by diffraction axicon in moment propagation through anisortopic birefringence crystal. This observation covers large range wavelength changes (from 520 nm to 534 nm). Theoretical explain effect is given.Keywords: laser with changing wavelength; diffraction axicon; birefringent crystal; bessel beams IntroductionIt is well-known the usage of anisotrophic elements to convert beams with the homogeneous polarization into cylindrical vector beams [1][2][3][4][5][6]. At the same time, it is necessary to implement the separation of the longitudinal modes along the optical axis of the system, which is parallel to the axis of the crystal. To improve convergence of the beams in the crystal, it is possible to use telescopic system or to form beams with high numerical aperture. Polarization and mode conversion during propagation along the axis of the crystal were considered for both Bessel and Gaussian beams [7][8][9][10][11][12][13][14][15][16].It has been shown in the studies [17,18] that during the propagation along the crystal axis neuraxial Bessel beams have other properties than Gaussian beams, namely, experiencing a uniform periodic change of intensity. In this case, the Bessel beam of zero order and second-order are periodically converted from one to another [7-9, 17, 18]. The oscillation period is directly proportional to the wavelength of the laser radiation and inversely proportional to the square of the spatial frequency of the laser beam and the difference of the dielectric capacitivity, which is corresponding to the ordinary and extraordinary rays. This dependence allows control occurring transformation in the crystal due to changes of the characteristics in either Bessel beam or crystal. In particular, the spatial frequency of the beam depends on the numerical aperture of the axicon [19][20][21][22] which shapes the beam, also it is possible to adjust characteristics of the beam by changing the beam divergence [23]. To change the parameters of the crystal, it can be heated [24] or effected by electro-optic [25]. However, the most convenient way of adjustment is to change the wavelength of the laser radiation which has a direct linear relationship from the period of transformation [26].It was experimentally demonstrated the ability [26] to manage the transformation of the Bessel beam at the output of the CaCO3 crystal by changing the wavelength of the radiation illuminating the diffractive axicon. It was achieved almost complete transformation of the Bessel beam of zero order beam to the second order using the axicon period of 2 µm and the wavelength at Δλ =1.5 of the initial value of λ = 637.5. The variation of the wavelength within a small range was achieved by changing the temperature of the laser. In contrast to this method, the usage of a laser with variable wavelength provides a wide range of Δλ, and therefore the possibility of achieving complete conversion using the axicon with a large period, i.e., a smaller numerical apertur...

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