V-shaped external cavity diode pump for 100nm continuous tuning of a difference-frequency generation

Maleki, Maryam; Sabouri, Saeed Ghavami; Khorsandi, Alireza

doi:10.1016/j.optlastec.2013.09.021

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Demand is growing for new laser sources radiating within the specific frequency ranges necessary for optical tracing of molecules and atoms in the near-and midinfrared region, [1] and for terahertz spectroscopy in the far-infrared region, using optically-pumped semiconductor devices. [2] A number of coherent sources, such as quantum cascade, [3] distributed-feedback quantum cascade, [4] and all solid-state lasers based on newly developed active materials like Nd:YVO 4 , [5] Er:YAG, [6] and Yb:YAG, [7] have been used extensively and developed for a relatively broad region of the spectrum.…”

Section: Introductionmentioning

confidence: 99%

Walk-off reduction, using an external optical plate and Bessel–Gaussian interaction

Mansouri¹,

Askarbioki²,

Sabouri³

et al. 2015

Chinese Phys. B

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To reduce the walk-off angle of the extraordinary third-harmonic ultraviolet wave at 355 nm generated by type II KTiOPO 4 and type I β -BaB 2 O 4 optical crystals, and the Gaussian output beam of a Q-switched Nd:YAG laser, a simple theoretical model was developed based on a rotatable BK7 plate of variable thickness. By rotating the plate up to 35 • along the beam direction, we reduced the walk-off angle up to ∼ 13%. The same phenomenon is predicted by the model, confirming the performance of the model. It is found that, due to the walk-off effect, the intensity profile of the thirdharmonic generation beam is slightly degraded. To compensate for the observed phenomena and further reduce the walkoff, we used a combination of a convex lens and an axicon to transform the beam profile of the interacting fundamental and second-harmonic generation waves to the zero-order Bessel-Gaussian form. As a result, the walk-off is decreased to ∼ 48.81 mrad, providing ∼ 30% relative reduction. By using the same BK7 plate rotated up to 35 • along the third-harmonic beam direction, the walk-off angle is further reduced to 38.9 mrad. Moreover, it is observed that the beam profile of the emerged Bessel-Gaussian third-harmonic generation beam remains unchanged with no degradation.

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