Frequency-domain parametric downconversion for efficient broadened idler generation

Ying Li; Yuhai Liang; Dahua Dai; Jianlong Yang; Haizhe Zhong; Dianyuan Fan

doi:doi:10.1364/PRJ.5.000669

Photonics Research, 2017, 5 (6): 06000669, Published Online: Dec. 7, 2017

Frequency-domain parametric downconversion for efficient broadened idler generation Download： 515次

Ying Li Yuhai Liang Dahua Dai Jianlong Yang Haizhe Zhong ^*Dianyuan Fan

Author Affiliations

International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China

Figures & Tables

Fig. 1. Schematic illustration of the proposed OC-FOPA scheme.

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Fig. 2. Simulated dependence of conversion efficiency and spectrum bandwidth of the mid-IR idler pulses on the crystal length, for (a), (c) the conventional fs-OPA and (b), (d) the proposed OC-FOPA schemes. It should be noted that for all intensity–length pairs of each OPA scheme, constant conversion efficiency and a similar idler spectrum [(c), (d)] can be achieved in the absence of temporal pulse slipping. The initial signal intensity was fixed at 1% of the pump intensity.

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Fig. 3. (a), (b) Small-signal idler spectrum bandwidth versus various grating chirp rates and (c), (d) spectrum details near the maximum value with a fixed spatial chirp coefficient (1+u)1/2 of 5, for different pulse duration cases. In the calculations, pump and signal have equivalent elliptical beam profiles, and the major and minor axes are 5 and 1 mm, respectively. The PPLN crystal length is fixed at 5 mm. Insets: The (1+u)1/2-dependent optimum chirp rates. τpump and τsignal represent the pulse duration of the pump and signal pulses, respectively. (a), (c) τpump=35 fs and τsignal=100 fs; (b), (d) τpump=100 fs and τsignal=100 fs.

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Fig. 4. (a) Dependence of the photon conversion efficiency on the spatial chirp coefficient (1+u)1/2, (b) the amplified idler spectra and the corresponding dispersion-compensated pulse envelopes, (c)–(f) the individual extracted spatial–spectral and spatial–temporal profiles. In the calculations, pump and signal have equivalent elliptical beam profiles, and the minor axes are fixed at 1 mm for various spatial chirp coefficients. The idler spectrum is obtained by linear superposition of each individual spectrum component across the spatial chirp axis x.

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Fig. 5. (a) Amplified idler spectra and (b) dispersion-compensated pulse envelopes at different seeding intensities. To minimize the GVM effects, the spatial chirp coefficient (1+u)1/2 was fixed at 20. The same simulation parameters were employed as those given in Fig. 4. The seeding intensity was set to 0.1%, 1%, 5%, and 10% of the pump intensity, corresponding to an overall efficiency of 9%, 50%, 59%, and 54%, respectively.

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Table1. Nonlinear Optical Crystal Parameters for 5% Doped MgO:PPLN at 24.5°C (λp=790 nm, λs=1030 nm, λi=3.4 μm)

$d_{eff}$ (pm/V)	$ν_{pump}$ (m/s)	$ν_{signal}$ (m/s)	$ν_{idler}$ (m/s)	$Λ_{0}$ (μm)	${GVD}_{pump}$ ( ${fs}^{2} / mm$ )	${GVD}_{siganl}$ ( ${fs}^{2} / mm$ )	${GVD}_{idler}$ ( ${fs}^{2} / mm$ )
16	$c / 2.258$	$c / 2.207$	$c / 2.203$	21.9	367	246	−800

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Ying Li, Yuhai Liang, Dahua Dai, Jianlong Yang, Haizhe Zhong, Dianyuan Fan. Frequency-domain parametric downconversion for efficient broadened idler generation[J]. Photonics Research, 2017, 5(6): 06000669.

Frequency-domain parametric downconversion for efficient broadened idler generation Download： 515次

Fig. 1. Schematic illustration of the proposed OC-FOPA scheme.

Table1. Nonlinear Optical Crystal Parameters for 5% Doped MgO:PPLN at 24.5°C (λp=790 nm, λs=1030 nm, λi=3.4 μm)

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Frequency-domain parametric downconversion for efficient broadened idler generation Download： 515次

Fig. 1. Schematic illustration of the proposed OC-FOPA scheme.

Table1. Nonlinear Optical Crystal Parameters for 5% Doped MgO:PPLN at 24.5°C (λp=790 nm, λs=1030 nm, λi=3.4 μm)

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