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

Samanta, G. K.; Kumar, S. Chaitanya; Mathew, Manoj; Canalias, Carlota; Pasiskevicius, Valdas; Laurell, Fredrik; Ebrahim-Zadeh, M.

doi:10.1364/ol.33.002955

Cited by 52 publications

(29 citation statements)

References 10 publications

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“…2(a), where the green beam was focused to w0~40 µm, thus indicating that the cause of the damage is related to the average power and not intensity. This observation also confirms that unlike the continuous-wave (cw) regime [16,17], where high cw powers in the green can be generated by PPKTP, in high-repetitionrate picosecond operation, power handling of the material is limited by optical damage. As such, to avoid any further damage to the crystal, we limited the input average green power to a maximum of ~1.6 W for pumping the OPO.…”

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confidence: 73%

Fiber-laser-based, green-pumped, picosecond optical parametric oscillator using fan-out grating PPKTP

2015

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We report a stable, Yb-fiber-laser-based, green-pumped, picosecond optical parametric oscillator (OPO) for the near-infrared based on the nonlinear crystal, PPKTP, using fan-out grating design, and operating near room temperature. The OPO is continuously tunable across 726-955 nm in the signal and 1201-1998 nm in the idler, resulting in a total signal plus idler wavelength coverage of 1026 nm by grating tuning at a fixed temperature. The device generates up to 580 mW of average power in the signal at 765 nm and 300 mW in the idler at 1338 nm with an overall extraction efficiency of up to 52% and a pump depletion >76%. The extracted signal at 765 nm and idler at 1746 nm exhibit excellent passive power stability better than 0.5% and 0.8% rms, respectively, over 1 hour, in good beam quality with TEM00 mode profile. The output signal pulses have Gaussian temporal duration of 13.2 ps with a FWHM spectral bandwidth of 3.4 nm at 79.5 MHz repetition rate. Power scaling limitations of the OPO due to the material properties of PPKTP are studied. © 2015 Optical Society of America OCIS codes : (190.4360) Nonlinear optics, devices; (190.7110) Ultrafast nonlinear optics; (190.4400) Nonlinear optics, materials; (190.4970 Rapid and continuously tunable, high-power, picosecond optical parametric oscillators (OPOs) in the near-infrared wavelength range are highly desirable for the advancement of microscopic techniques such as Coherent Anti-Stokes Raman Scattering (CARS), enabling several applications in biology and medicine [1][2][3]. Such OPOs are typically pumped in the green, which in turn rely on second harmonic generation (SHG) of mode-locked Nd-based solid-state or Yb-based fiber lasers [4]. Although picosecond green sources can provide high average powers, the ability to power scale green-pumped picosecond OPOs together with rapid tuning has been challenging [5]. While power scaling in OPOs depends on the available pump power and optimization of the output coupling However, in all these reports wavelength tuning has been achieved by varying the temperature of the nonlinear crystal, which is a relatively slow process.Here we report a stable, picosecond OPO based on fan-out design in PPKTP, enabling rapid grating tuning by translation of the nonlinear crystal while operating close to room temperature. The OPO, which is synchronously pumped by a mode-locked frequency-doubled Yb-fiber laser in the green, can provide continuous tuning over 726-955 nm in the signal wavelength range together with corresponding idler tuning across 1201-1998 nm. A maximum average power of 580 mW at 765 nm in the signal and 300 mW at 1338 nm in the idler, an overall extraction efficiency of up to 52%, and pump depletion >76% have been obtained. To the best of our knowledge, this is the first report of a picosecond OPO based on PPKTP using a fan-out grating design. The schematic of the experimental setup is shown in Fig. 1. The primary pump source is a mode-locked Yb-fiber laser (Fianium, FP1060-20) delivering ~20 ps pulses at 79.5 MHz repet...

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confidence: 73%

Fiber-laser-based, green-pumped, picosecond optical parametric oscillator using fan-out grating PPKTP

2015

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“…39 Most of the crystals applied in the nonlinear optics possess piezoelectric properties. The crystal complex electrical impedance is determined in the wide radiofrequency range from 10 −4 to 10 9 Hz.…”

Section: Ac Impedance Analysismentioning

confidence: 99%

Synthesis, Growth and Characterization of L-Valine Zinc Hydrochloride — A Novel Semi-Organic Nonlinear Optical Single Crystal

Jananakumar¹,

Prabaharan

2013

J. Nonlinear Optic. Phys. Mat.

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Single crystals of L-valine zinc hydrochloride (LVZHCl), a novel semi-organic nonlinear optical material were synthesized and grown from aqueous solution by slow evaporation method at room temperature. The cell parameters of LVZHCl had been determined using single crystal X-ray diffraction technique. The linear and non-linear optical properties of the crystals were studied by Fourier Transform Infrared, Ultraviolet Visible Near infrared, ac impedance, laser damage threshold, and second harmonic generation analysis. The thermal stability of the crystals was assessed by Differential thermalThermogravimetric analysis. The crystallinity and mechanical properties of the crystals were studied by Dielectric behavior and Vickers microhardness test.

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“…Of a number of QPM materials, periodically poled potassium titanyl phosphate (PPKTP) represents many attractive properties, such as high nonlinear coefficient d 33 =16.9 pm/V, wide transparency approximately to 4.3 µm, high optical damage threshold, low susceptibility to photorefractive damage. High quality periodic structures for efficient frequency conversion in PPKTP crystal have been demonstrated [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Efficient green light generation by Q-switched Nd: YAG laser in periodically poled potassium titanyl phosphate crystal

Zhang

Guo

2014

SPIE Proceedings

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

Cited by 52 publications

References 10 publications

Fiber-laser-based, green-pumped, picosecond optical parametric oscillator using fan-out grating PPKTP

Fiber-laser-based, green-pumped, picosecond optical parametric oscillator using fan-out grating PPKTP

Synthesis, Growth and Characterization of L-Valine Zinc Hydrochloride — A Novel Semi-Organic Nonlinear Optical Single Crystal

Efficient green light generation by Q-switched Nd: YAG laser in periodically poled potassium titanyl phosphate crystal

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