Efficient second-harmonic generation of a broadband radiation by control of the temperature distribution along a nonlinear crystal

Regelskis, K.; Želudevičius, Julijanas; Gavrilin, N.; Račiukaitis, Gediminas

doi:10.1364/oe.20.028544

Cited by 31 publications

(11 citation statements)

References 26 publications

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“…These simple closed-form expressions could be very useful for a practical design of SHG devices. Because of the relative insensitivity of the final conversion efficiency on the system parameters, e.g., the fundamental frequency, it is expected that by choosing the design parameters appropriately, new types of highly efficient frequency converters with large bandwidths could be fabricated with potential applications in short pulses upconversion as shown in [4][5][6][7][8]. An estimation for the required values of the design parameters associated with autoresonant SHG devices is provided in Appendix A.…”

Section: Discussionmentioning

confidence: 99%

“…Since the pioneering studies of nonlinear optics at the beginning of the 1960s [2,3], SHG was studied extensively in various types of materials and configurations and has been exploited in numerous applications. Over the years, various theoretical and experimental studies have shown that in many systems, the SHG conversion efficiency and bandwidth could be increased by varying the properties of the medium along the direction of the waves propagation [4][5][6][7][8]. Similar conclusions were obtained in other parametric processes, e.g., two-step third-harmonic generation [9], three-wave mixing (TWM) in the undepleted pump regime [10][11][12], and also TWM and four-wave mixing (FWM) where pump-depletion was taken into account [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Complete pump depletion by autoresonant second harmonic generation in a nonuniform medium

et al. 2013

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In this paper, we develop for the first time to our knowledge an analytical theory of second harmonic generation (SHG) in a generic nonuniform χ 2 medium. It is shown that by varying the properties of the medium gradually enough, the system can enter an autoresonant state in which the phases of the fundamental pump and of the generated second harmonic wave are locked. The effect of autoresonance allows efficient transfer of energy between the waves and, due to the continuous phase-locking in the system, all the energy of the pump could be converted to the second harmonic. Simple closed-form expressions for the waves amplitudes as a function of the longitudinal coordinate are derived, and an explicit criterion for the stability of the autoresonant state is obtained. Our analytical theory is compared to the numerical solution of the coupled mode equations, which are found to be in excellent agreement with each other. The analytical closed-form expressions that we derive could be very useful for practical design of SHG devices with increased performances, such as highly efficient, wideband frequency converters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complete pump depletion by autoresonant second harmonic generation in a nonuniform medium

et al. 2013

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“…One of the most promising approaches is to implement a temperature gradient along the direction of light propagation [36]. This has been experimentally shown in a nonlinear lithium triborate (LiB 3 O 5 -LBO) crystal and has led to improved conversion efficiency in second harmonic generation over a narrow bandwidth [37]. This technique has also been applied to broaden the phase-matching bandwidth in a periodically-poled channel waveguide up to 13 nm [38], as well as to shift the gain wavelength position in a fiber OPA [39].…”

Section: Introductionmentioning

confidence: 99%

Broadband and efficient adiabatic three-wave-mixing in a temperature-controlled bulk crystal

Markov¹,

Mazhorova²,

Breitenborn³

et al. 2018

Opt. Express

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Nonlinear interactions are commonly used to access to wavelengths not covered by standard laser systems. In particular, optical parametric amplification (OPA) is a powerful technique to produce broadly tunable light. However, common implementations of OPA suffer from a well-known trade-off, either achieving high efficiency for narrow spectra or inefficient conversion over a broad bandwidth. This shortcoming can be addressed using adiabatic processes. Here, we demonstrate a novel technique towards this direction, based on a temperature-controlled phase mismatch between the interacting waves. Using this approach, we demonstrate, by tailoring the temperature profile, an increase in conversion efficiency by 21%, reaching a maximum of 57%, while simultaneously expanding the bandwidth to over 300 nm. Our technique can readily enhance the performances of current OPA systems.

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“…This resulted in a 15% improvements in the generated SHG efficiency. At nearly the same time, Regelskis et al [18] employed an alternative oven configuration to provide a temperature gradient along a LiB 3 O 5 (LBO) crystal to achieve 68% of frequency doubling efficiency. The utilized LBO crystal which was embraced by two Brass plates located on the top and bottom of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Active Control of Thermal Dephasing Effect in High Power Continuous Wave Single-Pass Second Harmonic Generation

Sabouri

Khorsandi

2015

IEEE J. Quantum Electron.

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In this paper, we present a theoretical model that describes the performance of a specific oven configuration used to actively control the effect of thermal dephasing on the output characteristics of a high-power single-pass second-harmonic generation (SHG) in a MgO:sPPLT nonlinear crystal. The provided model is based on using step and slope oven configurations and making a quantitative comparison with the recent results obtained by using open-top oven scheme. It is found that in the slope oven scheme the SHG power is enhanced by 190% at a fundamental power of 50 W, indicating the significance of the represented model. Eventually, the merit of the proposed slope oven indicated through saturation control in the generation of high-power SH radiation.Index Terms-Nonlinear optical devices, nonlinear materials, second harmonic generation, thermal effects. 0018-9197

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Efficient second-harmonic generation of a broadband radiation by control of the temperature distribution along a nonlinear crystal

Cited by 31 publications

References 26 publications

Complete pump depletion by autoresonant second harmonic generation in a nonuniform medium

Complete pump depletion by autoresonant second harmonic generation in a nonuniform medium

Broadband and efficient adiabatic three-wave-mixing in a temperature-controlled bulk crystal

Active Control of Thermal Dephasing Effect in High Power Continuous Wave Single-Pass Second Harmonic Generation

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