Idler-resonant femtosecond tandem optical parametric oscillator tuning from 21 μm to 42 μm

Tillman, Karl A.; Reid, Derryck T.; Artigas, David; Jiang, Tao

doi:10.1364/josab.21.001551

Cited by 19 publications

(7 citation statements)

References 12 publications

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“…This scheme was first proposed using two independent periodically poled nonlinear crystals in the same cavity [8][9][10]. It was extended further by using a single crystal, with cascaded gratings, for both processes [10][11][12]. Recently, this concept was realized in a single nonlinear crystal that simultaneously phase-matched the OPO and DFG processes [13][14][15].…”

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confidence: 99%

“…For designing the quasi-periodic structure, we used the dual-grid method [16]. The design parameters used here are the same as in [11], except that thermal expansion of the ferroelectric domains [18] was precompensated. By applying a one-dimensional version of the dual-grid method, we obtained a quasi-periodic sequence of two building blocks, labeled A and B, with lengths of 16.25 and 14.28 μm, respectively.…”

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confidence: 99%

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

2014

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We report on an improvement of idler beam quality in a singly resonant optical parametric oscillator (OPO), where the resonant signal is converted to the idler via an additional difference frequency generation (DFG) process. The two processes are phase matched simultaneously by a quasi-periodically poled nonlinear crystal. Whereas back-conversion of the signal and idler to the pump frequency distorts the idler beam in a standard OPO, in a quasi-periodic OPO the DFG process reduces the signal intensity, leading to suppression of back-conversion and, hence, improvement in idler beam quality. Indeed, the experimental results show under the same pump power a significant improvement in idler beam quality for the quasi-periodic OPO (1≤M2≤2.1) as compared with the standard OPO (3.2≤M2≤5.3).

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confidence: 99%

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confidence: 99%

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

2014

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“…The achievable power conversion efficiencies for the conversion of the well-established 2 μm laser sources, such as a Tm:fiber laser pumped Ho:YAG laser, a Tm,Ho:fiber laser, or a Tm,Ho:YLF laser, into the relatively long wavelength region of 8-12 μm are rather low due to the relatively small quantum efficiencies (25%-17% corresponding to the conversion of a 2 μm pump to an 8 μm idler and a 2 μm pump to a 12 μm idler, respectively). One solution is the use of cascaded optical parametric amplification (OPA) processes for the enhancement of the conversion efficiency of the idler, whose wavelength is in the 8-12 μm band in our case, compared to what is achievable by a single OPA process [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In such a device, when pumped by a laser source, the signal is amplified, and the idler is generated as a result of the first OPA process (OPA 1).…”

Section: Introductionmentioning

confidence: 99%

Idler-efficiency-enhanced long-wave infrared beam generation using aperiodic orientation-patterned GaAs gratings

2016

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In this paper, we design aperiodic gratings based on orientation-patterned gallium arsenide (OP-GaAs) for converting 2.1 μm pump laser radiation into long-wave infrared (8-12 μm) in an idler-efficiency-enhanced scheme. These single OP-GaAs gratings placed in an optical parametric oscillator (OPO) or an optical parametric generator (OPG) can simultaneously phase match two optical parametric amplification (OPA) processes, OPA 1 and OPA 2. We use two design methods that allow simultaneous phase matching of two arbitrary χ⁽²⁾ processes and also free adjustment of their relative strength. The first aperiodic grating design method (Method 1) relies on generating a grating structure that has domain walls located at the zeros of the summation of two cosine functions, each of which has a spatial frequency that equals one of the phase-mismatch terms of the two processes. Some of the domain walls are discarded considering the minimum domain length that is achievable in the production process. In this paper, we propose a second design method (Method 2) that relies on discretizing the crystal length with sample lengths that are much smaller than the minimum domain length and testing each sample's contribution in such a way that the sign of the nonlinearity maximizes the magnitude sum of the real and imaginary parts of the Fourier transform of the grating function at the relevant phase mismatches. Method 2 produces a similar performance as Method 1 in terms of the maximization of the height of either Fourier peak located at the relevant phase mismatch while allowing an adjustable relative height for the two peaks. To our knowledge, this is the first time that aperiodic OP-GaAs gratings have been proposed for efficient long-wave infrared beam generation based on simultaneous phase matching.

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“…Although 2 μm fiber lasers have been developed in the fs regime [5], to go further into the mid-IR requires frequency conversion. Different frequency generation (DFG) is an option [6], but typically has low efficiency Synchronously pumped optical parametric oscillators (OPOs) are recognized as useful laser sources for the production of tunable output pulses over a broad wavelength range including the mid-IR [7][8][9]. This includes phase-stabilised OPOs extending the frequency comb of carrier-envelope-offset locked pump lasers to enable high precision spectroscopic studies [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Yb-fiber amplifier pumped idler-resonant PPLN optical parametric oscillator producing 90 femtosecond pulses with high beam quality

Feehan

Shen

et al. 2014

Appl. Phys. B

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An idler-resonant femtosecond optical parametric oscillator (OPO) with near-diffraction-limited beam quality (M 2~1 .05) at ~2.4 μm is demonstrated. The OPO is synchronously pumped by a femtosecond Yb:fiber amplifier system providing 130 fs pulses with an average power of 4.5 W at 1050 nm and delivers 90 fs pulses with maximum average powers of 600 mW for the idler and 670 mW for the signal. Tunability, is demonstrated across idler (signal) wavelengths from 2.2-2.6 μm (1.76-2.0 μm), limited only by the OPO mirrors. As a demonstration of the utility of the source, the idler pulses are used to generate a supercontinuum from 1600 nm to 3200 nm in a silicon-core fiber.

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Idler-resonant femtosecond tandem optical parametric oscillator tuning from 21 μm to 42 μm

Cited by 19 publications

References 12 publications

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

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

Idler-efficiency-enhanced long-wave infrared beam generation using aperiodic orientation-patterned GaAs gratings

Yb-fiber amplifier pumped idler-resonant PPLN optical parametric oscillator producing 90 femtosecond pulses with high beam quality

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