Second harmonic generation of periodically poled potassium titanyl phosphate waveguide using femtosecond laser pulses

Zhang, Shuanggen; Yao, Jing; Liu, Weiwei; Huang, Zu‐En; Wang, Jue; Li, Yongnan; Tu, Chenghou; Lu, Fuyun

doi:10.1364/oe.16.014180

Cited by 18 publications

(18 citation statements)

References 12 publications

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“…1(b) a refractive index profile n 3 can be induced by a proper choice of writing parameters, which allows for guiding of nearly circular fundamental modes [34]- [36]. Besides the media discussed in this paper Type II waveguides have been realized in a wide range of different crystalline materials like garnets [37], tungstates [38], fluorides [39], niobates [34], phosphates [40], borates [41], and sapphire [42].…”

Section: A Type I Waveguiding Structuresmentioning

confidence: 97%

Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range

Calmano

Müller

2015

IEEE J. Select. Topics Quantum Electron.

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This paper summarizes our recent results on crystalline waveguides and waveguide lasers fabricated by the femtosecond-laser writing technique. Highly efficient waveguide lasers emitting in the near infrared spectral range based on ytterbium and neodymium doped Y 3 Al 5 O 12 with slope efficiencies above 70% and continuous wave output powers of more than 5 W were demonstrated. Furthermore, pulsed laser operation of passively Q-switched Yb:YAG and Nd:YAG wavequide lasers was achieved by incorporating the saturable absorber Cr 4+ :YAG in a monolithic setup. Based on fs-laser written curved structures in Yb:YAG, efficient curved waveguide lasers could be demonstrated. Also, waveguide lasers in the visible spectral range were investigated. We achieved laser emission in the green, orange, red and deep-red spectral region and could demonstrate output powers of more than 1 W with waveguides based on praseodymium doped materials. Additionally, switchable and dual wavelength operation between the orange and red laser emission was achieved. By utilizing the nonlinear crystal KTiOPO 4 as substrate material for fs-laser inscription, nonlinear waveguides were realized. With these devices, efficient second harmonic generation into the blue and green spectral range was achieved.

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Section: A Type I Waveguiding Structuresmentioning

confidence: 97%

Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range

Calmano

Müller

2015

IEEE J. Select. Topics Quantum Electron.

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“…It is also employed in a variety of frequency conversion applications. Considerable attention has been paid to the fabrication of waveguides in other nonlinear crystals [8], such as active-ion-doped YAG [9,10], KTiOPO 4 [11,12], and LiNbO 3 [13][14][15][16][17]. But successful demonstration has not been possible in KDP [18].…”

Section: Introductionmentioning

confidence: 99%

Waveguide fabrication in KDP crystals with femtosecond laser pulses

et al. 2014

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Optical waveguides fabricated in potassium dihydrogen phosphate (KDP) by ultrafast laser pulses are demonstrated. Dependent on the incident pulse energy, two different types of refractive index modification have been induced. For moderate laser powers, type I homogeneous waveguides are created. At higher pulse energies, type II waveguides are formed in the stressed area surrounding regions of laser-induced damage. Double-line and four-line structures are applied to the type II guides to increase mode confinement. Polarization sensitivity and transmission properties of the written waveguides are characterized and discussed. The results indicate that high-quality waveguides can be fabricated in KDP, which has potential for further applications in nonlinear integrated-optics.

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“…The growth process and rare earth metal doping were used to modify the physical properties and to reduce the defects in the KTP crystals [19][20][21]. Ionic conductivity and thermal stability are the major concerns in the processing of waveguides and producing stable waveguide device [22][23][24]. The ferroelectric and dielectric polarization variations are occurs due to the doping and it alters the conductivity in the crystal [25].…”

Section: Introductionmentioning

confidence: 99%