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Simultaneous stimulated Raman scattering and second harmonic generation in periodically poled lithium niobate

Gail McConnell and Allister I. Ferguson

Open Access Open Access

Abstract

Simultaneous stimulated Raman scattering (SRS) and second harmonic generation (SHG) are demonstrated in periodically poled lithium niobate (PPLN). Using a simple single-pass geometry, conversion efficiencies of up to 12% and 19% were observed for the SRS and SHG processes respectively. By changing the PPLN period interacting with the photonic crystal fibre based pump source and varying the PPLN temperature, the SHG signal was measured to be tunable from λ=584 nm to λ=679 nm. The SRS output spectrum was measured at λ=1583 nm, with a spectral full-width at half-maximum of λ=85 nm.

©2005 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Experimental set-up. The output of a continuous wave mode-locked Nd3+:YLF laser was sent through a half-wave plate into photonic crystal fiber (PCF) using an aspheric lens (A) of focal length f=+8 mm. The fibre output was collimated using another aspheric lens (B) of focal length f=+4.5 mm. Using a spherical lens (C) of focal length f=+40mm, the soliton self-frequency shifted output and the residual pump light was focused into a 6.5 mm long PPLN crystal.

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Fig. 2.
Fig. 2. By rotating the half-wave plate prior to the PCF, a weak polarization dependence of the pump polarization on the SSFS power was observed, with a measured decrease in average power of up to 24%.

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Fig. 3.
Fig. 3. The SSFS optical spectrum transmitted by the PCF (±1 nm wavelength accuracy, linear scale). The pump laser is evident as a small peak at 1047 nm. The SSFS maximum was measured at 1258 nm.

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Fig. 4.
Fig. 4. Two-photon autocorrelation of the SSFS PCF output. The FWHM of the measured pulse was 220 fs. Assuming a sech2 pulse shape, this corresponded to a pulse width of approximately 140 fs.

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Fig. 5.
Fig. 5. The SHG spectra as measured at the PPLN output, where the PPLN crystal was held at a fixed temperature of 110 °C. The legend refers to the period length chosen to interact with the input SSFS radiation. The bandwidth of the SHG output varies from 2.8 nm to 4.2 nm.

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Fig. 6.
Fig. 6. The SRS spectrum resulting from pumping the PPLN with the SSFS source. The spectral peak was measured at λ=1583 nm, with a λ=85 nm FWHM.

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