Improved idler beam quality via simultaneous parametric oscillation and signal-to-idler conversion

Sharabi, Shani; Porat, Gil; Arie, Ady

doi:10.1364/ol.39.002152

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…On the contrary, this conversion efficiency in the cascaded OPO can be enhanced because the intra-cavity primary signal intensity is clamped to a certain level by the DFG process and thus the back-conversion effect is greatly relieved. It is also worth mentioning that the beam quality of the cascaded OPO was not significantly improved in our experiment (M 2 less than 2 for both cascaded and conventional OPOs) which was dramatically enhanced in previous investigations [18,20]. The low peak power from the pump fiber laser which eased the back-conversion of the conventional OPO and severe thermal effect caused by higher idler output power which deteriorated the beam quality of the cascaded OPO might be the reason.…”

Section: Resultscontrasting

confidence: 51%

“…With the rapid development of the poling technique for QPM crystals, both experimental and theoretical investigations on cascaded OPOs have been carried out employing either monolithic dual grating periodically poled [12] or aperiodically poled ferroelectric crystals [13][14][15][16][17][18] to reduce the insertion loss and improve the OPO performances. However, there was always a perfect operation temperature for such cascaded OPO at which the OPO and DFG processes would produce the same idler wavelength and thus improve the pump-to-idler conversion efficiency effectively.…”

Section: Introductionmentioning

confidence: 99%

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Temperature insensitive, high-power cascaded optical parametric oscillator based on an aperiodically poled lithium niobate crystal

Chen¹,

Jiang²,

Wu³

et al. 2014

Opt. Express

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We report a novel temperature insensitive, APMgLN-based, high-power cascaded optical parametric oscillator (OPO) pumped by an Ytterbium-doped fiber laser. A monolithic APMgLN crystal was designed to compensate the phase mismatches for the nonlinear conversions from the pump to the idler and the primary signal to the idler simultaneously in a wide temperature range. Efficient parametric conversion with pump-to-idler conversion efficiency over 15% and slope efficiency higher than 20% was realized from 25 °C to 55 °C. The idler wavelength was down-shifted from 3.82 μm to 3.78 μm accordingly during the temperature rise. The highest idler power of 4.1 W at 3.8 μm under the pump power of 26.5 W was recorded which was improved by ~32% in pump-to-idler conversion efficiency when compared with the PPMgLN-based conventional OPO, in which the highest idler output power was 3.1W under the same pump and thermal condition.

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Section: Resultscontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Temperature insensitive, high-power cascaded optical parametric oscillator based on an aperiodically poled lithium niobate crystal

Chen¹,

Jiang²,

Wu³

et al. 2014

Opt. Express

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show abstract

“…6. It is believed that back-conversion and thermal effects in the OPO could be responsible for the lower output beam quality in this case [17]. The beam quality appears to degrade more in the horizontal x direction at maximum pump power making the beam elliptical at focus.…”

Section: Continuous-wave Pulsed Operationmentioning

confidence: 86%

Compact picosecond mid-IR PPLN OPO with controllable peak powers

Wu¹,

Liang²,

Fu³

et al. 2020

OSA Continuum

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We report a high-repetition-rate, compact, mid-infrared picosecond (ps) optical parametric oscillator (OPO) based on periodically poled lithium niobate (PPLN). The OPO is synchronously pumped by an ytterbium-doped-fibre (YDF) master-oscillator-power-amplifier (MOPA) system, seeded by a 1040-nm gain-switched laser diode (GSLD). Under continuous-wave (cw) pulsed operation, at a 1.5-GHz repetition rate and 14-W pump power, an idler average power of 2.4 W (∼30 W peak power) was achieved, with an idler wavelength tunability of 2260-3573 nm. Through the addition of an electro-optic modulator (EOM) to the MOPA system, acting as a time gate to suppress a variable number of pulses per 1 µs, a quasi-cw pumping regime was realized, allowing burst-mode operation of the OPO at a 1-MHz inter-burst repetition rate. By varying the burst window time with the EOM, controllable idler peak powers of up to 1.2 kW were then realized.

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“…approximately half of the theoretical limit [4]. Ignoring these inevitable effects, many techniques for improving conversion efficiency of OPO have been employed [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

High Conversion Efficiency, Mid-Infrared Pulses Generated via Burst-Mode Fiber Laser Pumped Optical Parametric Oscillator

Cai

Ruan

et al. 2020

IEEE Access

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We present a mid-infrared optical parametric oscillator (OPO) with a high pump-to-idler conversion efficiency from 1.06 µm to 3.8 µm, which was quasi-synchronously pumped by a burstmode fiber laser. The pump pulse was specially designed with a rectangular profile in temporal, which was composed of hundreds of ultrashort sub-pulses. By applying the quasi-synchronous pumping scheme, the buildup time of the parametric signal pulse could be minimized. No back-conversion effect was observed when the pump peak power was increased. A maximum pump-to-idler conversion efficiency of 19.6% was achieved when the number of intra-burst sub-pulses was set to be 240. By increasing the number of intraburst sub-pulses to be about 480, the maximum average output power of 7.9 W at 3.8 µm was realized under pump power of 45.3 W. The corresponding pump-to-idler conversion efficiency was computed to be about 17.5%. The experimental results show an improvement of 40% in pump-to-idler conversion efficiency for this quasi-synchronously pumped OPO when compared with the conventional long laser pulse pumped OPO. INDEX TERMS Mid-infrared, optical parametric oscillator, quasi-synchronously pumped, burst-mode fiber laser.

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Improved idler beam quality via simultaneous parametric oscillation and signal-to-idler conversion

Cited by 9 publications

References 24 publications

Temperature insensitive, high-power cascaded optical parametric oscillator based on an aperiodically poled lithium niobate crystal

Temperature insensitive, high-power cascaded optical parametric oscillator based on an aperiodically poled lithium niobate crystal

Compact picosecond mid-IR PPLN OPO with controllable peak powers

High Conversion Efficiency, Mid-Infrared Pulses Generated via Burst-Mode Fiber Laser Pumped Optical Parametric Oscillator

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