High-power, continuous-wave, tunable mid-IR, higher-order vortex beam optical parametric oscillator

Optics Letters
A AadhiG K Samanta

Abstract

We report on a novel experimental scheme to generate continuous-wave (cw), high-power, and higher-order optical vortices tunable across a mid-IR wavelength range. Using a cw, two-crystal, singly resonant optical parametric oscillator (T-SRO) and pumping one of the crystals with a Gaussian beam and the other crystal with optical vortices of orders lp=1-6, we have directly transferred the vortices at near-IR to the mid-IR wavelength range. The idler vortices of orders li=1-6 are tunable across 2276-3576 nm with a maximum output power of 6.8 W at an order of li=1 for the pump power of 25 W, corresponding to a near-IR vortex to mid-IR vortex conversion efficiency as high as 27.2%. Unlike the SROs generating optical vortices restricted to lower orders (≤2) due to the elevated operation threshold of SROs with higher-order pump vortices, here the coherent energy coupling between the resonant signals of two crystals of T-SRO facilitates the transfer of pump vortex of any order to the idler wavelength without a stringent operation threshold condition. The generic experimental scheme can be used in any wavelength range across the electromagnetic spectrum and in all timescales, from cw to ultrafast regimes.

References

Aug 15, 2003·Nature·David G Grier
Nov 5, 2003·Nature Biotechnology·Stefan W Hell
Feb 10, 2004·Applied Optics·S S R OemrawsinghG W 't Hooft
Feb 1, 1992·Optics Letters·N R HeckenbergA G White
Aug 19, 2011·Optics Letters·G K Samanta, M Ebrahim-Zadeh
Jul 21, 2015·Optics Express·Aizitiaili AbulikemuTakashige Omatsu
Sep 16, 2015·Optics Letters·N Apurv ChaitanyaG K Samanta
Jun 16, 2016·Optics Letters·N Apurv ChaitanyaM Ebrahim-Zadeh

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Citations

Oct 16, 2019·Optics Letters·Manman DingValentin Petrov
Jul 5, 2019·Scientific Reports·Varun SharmaM Ebrahim-Zadeh

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