Dynamics of cw intra-cavity second harmonic generation by PPKTP

Greenstein, S.; Rosenbluh, M.

doi:10.1016/j.optcom.2004.04.044

Cited by 14 publications

(10 citation statements)

References 22 publications

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“…In this Letter, we report efficient generation of high-power cw radiation at 532 nm in a compact and practical design based on simple single-pass, secondharmonic-generation (SHG) of a cw ytterbium (Yb) fiber laser in PPKTP. Earlier reports of cw SHG in the visible based on PPKTP include intracavity [4], external enhancement [5], and single-pass configurations [6], but the highest cw SH power achieved so far has been 2.3 W in multimode output [4]. As such, power scaling of SHG and performance of the material at in-creased powers has not been reported, to our knowledge.…”

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confidence: 90%

“…For frequency conversion in the visible, QPM materials such as MgO-doped periodically poled stoichiometric LiTaO 3 (MgO:sPPLT) [2,3] and periodically poled KTiOPO 4 (PPKTP) [2,[4][5][6][7] are attractive alternatives, offering increased resistance to photorefractive damage and relatively high effective nonlinearities ͑d eff ϳ 10 pm/ V͒. Advances in material growth and fabrication have also led to the availability of such QPM materials with high optical quality, shorter grating periods, and long interaction lengths (up to 30 mm), enabling the development of frequency-conversion devices for the visible in the cw [2,[4][5][6] and low-intensity pulsed regimes [7].…”

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confidence: 99%

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High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO_4

et al. 2008

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We report efficient generation of high-power, cw, single-frequency radiation in the green in a simple, compact configuration based on single-pass, second-harmonic generation of a cw ytterbium fiber laser at 1064 nm in periodically poled KTiOPO(4). Using a crystal containing a 17 mm single grating with period of 9.01 microm, we generate 6.2 W of cw radiation at 532 nm for a fundamental power of 29.75 W at a single-pass conversion efficiency of 20.8%. Over the entire range of pump powers, the generated green output is single frequency with a linewidth of 8.5 MHz and has a TEM(00) spatial profile with M(2)<1.34. The demonstrated green power can be further improved by proper thermal management of crystal heating effects at higher pump powers and also by optimized design of the grating period to include thermal issues.

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confidence: 90%

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confidence: 99%

High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO_4

et al. 2008

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“…Periodically poled lithium niobate (PPLN) structures with KNbO 3 and KTiOPO 4 are one of the most promising components for frequency doubling and therefore for the realization of visible laser sources at short wavelengths [1][2][3][4]. However, LiNbO 3 is known to have high photorefractive properties, i.e.…”

Section: Introductionmentioning

confidence: 99%

Green light generation in a periodically poled Zn-doped LiNbO3 planar waveguide fabricated by He+ implantation

et al. 2007

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An optical planar waveguide is investigated in ZnOdoped periodically poled lithium niobate formed by He + implantation. Optical losses were found to be 2 dB/cm. Secondharmonic generation is used to produce a green laser beam by quasi-phase matching in the obtained waveguide. The conversion efficiency was found to be 10 −2 %/W. Photorefractive resistance properties are reported and discussed relating to undoped periodically poled lithium niobate.

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“…An intracavity structure is commonly used to increase the effective interaction length in the nonlinear crystals and the fundamental wave intensity. This approach has a number of benefits over the singlepass approach, such as compact form factor, low-cost, as well as a high conversion efficiency and high output power [18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Nonlinear crystals such as lithium triborate (LBO) [27][28][29], potassium titanyl phosphate (KTP) [19][20][21], periodically-poled potassium titanyl phosphate (PPKTP) [22,23], and magnesium-oxide doped periodically-poled lithium niobate (MgO:PPLN) [24][25][26] have been used in both the single-pass and intracavity SHG. Among these nonlinear crystals, MgO:PPLN has attracted a lot of attention due to its high nonlinear coefficient, large available crystal size and simple wafer-based fabrication process.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Study of PPLN Length Dependence in Intracavity SHG

Kashak

Flannigan

2021

Preprint

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In this paper, a systematic study of the relationship between nonlinear crystal length and intracavity second-harmonic generation (SHG) using MgO-doped periodically-poled lithium niobate (MgO:PPLN) is presented. The experimental results demonstrate a relationship between the maximum SHG power generated and the full-width at half maximum (FWHM) of the crystal’s temperature tuning curve to the length of the nonlinear optical crystal. It was shown that maximum SHG power increases rapidly with the increase of MgO:PPLN length, reaching a saturation length (~2 mm), which is much shorter than that predicted by the single-pass SHG theory. This saturation length of the MgO:PPLN crystal is almost independent on 808 nm pump power for typical powers used in continuous wave intracavity SHG lasers. In addition to this saturation effect, a broadening effect was also observed, the FWHM of the temperature tuning curve was shown to have a larger FWHM than that predicted by the single-pass SHG theory for MgO:PPLN shorter than the saturation length. This work has the benefit of allowing engineers to optimize nonlinear crystal length when developing intracavity SHG based diode-pumped solid state (DPSS) lasers.

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Dynamics of cw intra-cavity second harmonic generation by PPKTP

Cited by 14 publications

References 22 publications

High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO_4

High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO_4

Green light generation in a periodically poled Zn-doped LiNbO3 planar waveguide fabricated by He+ implantation

A Systematic Study of PPLN Length Dependence in Intracavity SHG

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