Group-velocity-matched noncollinear second-harmonic generation in quasi-phase matching

Fujioka, Nobuhide; Ashihara, Satoshi; Ono, H.; Shimura, Tsutomu; Kuroda, Kazuyuki

doi:10.1364/josab.22.001283

Cited by 21 publications

(10 citation statements)

References 23 publications

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“…Some of the most successful nonlinear materials such as periodically poled lithium niobate (PPLN) also exhibited severe limitations posed by the GVM such as pulse distortion and saturation effects when using femtosecond pulses [21]. Recently, GVM correction schemes such as quasi-group-velocity-matching [22] and noncollinear SHG [23] have been demonstrated in PPLN to mitigate these limitations. As such, we start by examining a BRW structure, with a minimal attainable GVM as an intuitive choice for an optimal design.…”

Section: Simulation Resultsmentioning

confidence: 99%

Femtosecond second-harmonic generation in AlGaAs Bragg reflection waveguides: theory and experiment

et al. 2010

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The impact of third-order nonlinearities including self-phase modulation and two-photon absorption on the efficiency of the second-harmonic generation is numerically investigated using the split-step Fourier method in phase-matched Bragg reflection waveguides. Also using the same technique, the adverse effects of group velocity mismatch and group velocity dispersion of the interacting frequencies on the efficiency of the nonlinear process are examined and contrasted for optimal sample design. Using an optimized structure, we report efficient femtosecond second-harmonic generation in monolithic AlGaAs Bragg reflection waveguides for a type II nonlinear interaction. For a 190 fs pulsed pump around 1555 nm with an average power of 3.3 mW, a peak second-harmonic power of 25.5 W is measured in a sample with a length of 1.1 mm. The normalized conversion efficiency of the process is estimated to be 2.0ϫ 10 4 % W −1 cm −2. Pump depletion is clearly observed when operating at the phase-matching wavelength.

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Section: Simulation Resultsmentioning

confidence: 99%

Femtosecond second-harmonic generation in AlGaAs Bragg reflection waveguides: theory and experiment

et al. 2010

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“…But this device is inconvenient to use because it not only has small temperature tolerance but also high optical loss due to many couplers and bends. Fujioka et al generated an SH wave at 780 nm with 11 nm bandwidth under noncollinear quasiphase-matching (QPM) geometry [2]. This scheme requires precise control of the noncollinear angle and the propagation direction, therefore making the adjustment of experiment equipment rather difficult.…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO doping of periodically poled lithium niobate on second-harmonic generation of femtosecond laser pulses

Zhang

Chen

et al. 2007

Appl. Opt.

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We theoretically analyze type-I broadband second-harmonic generation (SHG) of femtosecond laser pulses based on a quasi-phase-matching configuration in periodically poled congruent LiNbO3 (LN) andperiodically poled MgO:LiNbO3 (PPMgLN) (5% and 7%). Group-velocity matching (GVM) can be achieved at the fundamental waves of 1.59, 1.56, and 1.55 microm for SHG when the three types of crystals have grating periods of 22.31, 20.07, and 23.45 microm, respectively. It is found that the central wavelength of the fundamental wave for GVM will increase with the decrease of MgO doping in LN. It is concluded that the shift of the GVM central wavelength is due to the difference of MgO doping, which changes the dispersion of the crystal. Therefore, tunable and high efficiency broadband SHG of femtosecond laser pulses in a long crystal can be realized by selecting different doping rates of PPMgLN.

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“…Frequency conversion of a femtosecond pulse to another wavelength is significantly important in the widespread field of laser science and technology [1][2][3]. Femtosecond lasers have a wavelength bandwidth as large as tens of nanometers, and a temporal walk-off effect occurs as a result of large groupvelocity mismatch (GVM).…”

Section: Introductionmentioning

confidence: 99%

Frequency conversion of femtosecond laser pulses in an engineered aperiodic poled optical superlattice

2007

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We theoretically propose a procedure based on a cascading genetic algorithm for the design of aperiodically quasi-phase-matched gratings for frequency conversion of optical ultrafast pulses during difference-frequency generation. By designing the sequence of a domain inversion grating, different wavelengths at the output idler pulse almost have the same phase response, so femtosecond laser pulses at wavelength 800 nm can be shifted to other wavelengths without group-velocity mismatch.

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Group-velocity-matched noncollinear second-harmonic generation in quasi-phase matching

Cited by 21 publications

References 23 publications

Femtosecond second-harmonic generation in AlGaAs Bragg reflection waveguides: theory and experiment

Femtosecond second-harmonic generation in AlGaAs Bragg reflection waveguides: theory and experiment

Effect of MgO doping of periodically poled lithium niobate on second-harmonic generation of femtosecond laser pulses

Frequency conversion of femtosecond laser pulses in an engineered aperiodic poled optical superlattice

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