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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 9 — Oct. 3, 2011

Compact, 1.5 mJ, 450 MHz, CdSiP 2 picosecond optical parametric oscillator near 6.3 μm

S. Chaitanya Kumar, A. Agnesi, P. Dallocchio, F. Pirzio, G. Reali, K. T. Zawilski, P. G. Schunemann, and M. Ebrahim-Zadeh  »View Author Affiliations


Optics Letters, Vol. 36, Issue 16, pp. 3236-3238 (2011)
http://dx.doi.org/10.1364/OL.36.003236


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Abstract

We report a compact, efficient, high-energy, and high-repetition-rate mid-IR picosecond optical parametric oscillator (OPO) based on the new nonlinear material CdSiP 2 (CSP). The OPO is synchronously pumped by a master oscillator power amplifier system at 1064.1 nm , providing 1 μs long macropulses constituting 8.6 ps micropulses at 450 MHz , and it can be tuned over 486 nm across 6091 6577 nm , covering the technologically important wavelength range for surgical applications. Using a compact ( 30 cm ) cavity and improved, high-quality nonlinear crystal, idler macropulse energy as high as 1.5 mJ has been obtained at 6275 nm at a photon conversion efficiency of 29.5%, with > 1.2 mJ over more than 68% of the tuning range, for an input macropulse energy of 30 mJ . Both the signal and idler beams are recorded to have good beam quality with a Gaussian spatial profile, and the extracted signal pulses are measured to have durations of 10.6 ps . Further, from the experimentally measured transmission data at 1064 nm , we have estimated the two-photon absorption coefficient of CSP to be β = 2.4 cm / GW , with a corresponding energy bandgap, E g = 2.08 eV .

© 2011 Optical Society of America

OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(170.6935) Medical optics and biotechnology : Tissue characterization

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 6, 2011
Manuscript Accepted: July 15, 2011
Published: August 15, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
S. Chaitanya Kumar, A. Agnesi, P. Dallocchio, F. Pirzio, G. Reali, K. T. Zawilski, P. G. Schunemann, and M. Ebrahim-Zadeh, "Compact, 1.5 mJ, 450 MHz, CdSiP2 picosecond optical parametric oscillator near 6.3 μm," Opt. Lett. 36, 3236-3238 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-36-16-3236

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