S. Manjoorana, H. Zhaoa, I. T. Lima Jr.b, and A. Majora, *
a Department of Electrical and Computer Engineering, University of Manitoba,
75A Chancellors Circle, Winnipeg, MB, R3T 5V6, Canada
b Department of Electrical and Computer Engineering, North Dakota State University,
1411 Centennial Blvd., Fargo, ND 58108-6050, USA
*e-mail: a_major@umanitoba.ca
Received March 12, 2012; in final form, March 28, 2012; published online July 9, 2012
Abstract—Ultrashort pulses with wavelength tuning in the visible and near-infrared (VNIR) ranges (here
approximately 680 to 2000 nm) have wide application in many biomedical devices especially in imaging and
spectroscopy. The theoretical studies here consider the phase-matching conditions of three periodically poled
crystals (PPKTP, MgO:PPcLN and MgO:PPSLT) to use for femtosecond optical parametric oscillators (OPO)
to generate wavelength tunability in this range. The basic optical properties and the wavelength tuning ranges
are calculated with respect to different grating periods and temperature variation. Dispersive properties of crys-
tals relevant to the ultrafast operation regime are also discussed. The excitation wavelength used here for the
analysis is 520 nm which is the second harmonic wavelength of Yb-doped ultrashort pulse solid state lasers.
The concept of the tunable femtosecond OPOs with green excitation presented here can be a better alternative
to the widely used expensive Ti:Sapphire lasers.
DOI: 10.1134/S1054660X12080142
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