Abstract

We report the first ever femtosecond supercontinuum generation in a KDP crystal using ~100 fs pulses at 790 nm irradiation. Due to the quadratic nonlinearities of the KDP crystal an enhanced bandwidth of 385–960 nm is generated. The spatial and temporal coherence of the generated white light is demonstrated using Young’s double slit interference configuration and a Michelson interferometer.

© 2005 Optical Society of America

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References

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    [CrossRef]
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App. Phys. B (2)

T. Kobayashi and A. Shirakawa, �??Tunable visible and near-infrared pulse generator in a 5 fs regime�??, App. Phys. B 70, S239-S246 (2000).
[CrossRef]

A. Baltuska and T. Kobayashi, �??Adaptive shaping of two-cycle visible pulses using a flexible mirror,�?? App. Phys. B 75, 427-443 (2002).
[CrossRef]

Appl. Phys. B (2)

S. Cussat-Blanc, A. Ivanov, D. Lupinski, and E. Freysz, �??KTiOPO4, KTiOAsO4, and KNbO3 crystals for mid-infrared femtosecond optical parametric amplifiers: analysis and comparison,�?? Appl. Phys. B 70, S247- S252 (2000).
[CrossRef]

V. P. Kandidov, O. G. Kosareva, I. S. Golubtsov, W. Liu, A. Becker, N. Akozbek, C. M. Bowden, S. L. Chin, �??Self-transformation of a powerful femtosecond laser pulse into a white-light pulse in bulk optical media (or super continuum generation),�?? Appl. Phys. B 77, 149-165 (2003).
[CrossRef]

Appl. Phys. Lett. (1)

K. Cook, A. K. Kar, and R. A. Lamb, �??White-light supercontinuum interference of self �?? focused filaments in water,�?? Appl. Phys. Lett. 83, 3861-3863 (2003).

J. Appl. Phys. (1)

W. Watanabe and K. Itoh, �??Spatial coherence of supercontinuum emitters from multiple filaments,�?? Jpn. J. Appl. Phys. 40, 592-595 (2001).
[CrossRef]

J. Opt. Soc. Am. B (3)

Nature (1)

T. Kobayashi, T. Saito, and H. Ohtani, �??Real-time spectroscopy of transition states in bacteriorhodopsin during retinal isomerization,�?? Nature 414, 531 - 534 (2001).
[CrossRef] [PubMed]

Opt. Commun. (1)

A. Brodeur, F. A. Ilkov, and S. L. Chin, �??Beam filamentation and the white light continuum divergence,�?? Opt. Commun. 129, 193-198 (1996).
[CrossRef]

Opt. Express (4)

M. Aoyama, T. Harimoto, J. Ma, Y. Akahane, and K. Yamakawa, �??Second - harmonic generation of ultrahigh intensity femtosecond pulses with a KDP crystal,�?? Opt. Express 9, 579 �?? 585 (2001), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-11-2397">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-11-2397</a>
[CrossRef] [PubMed]

A. K. Dharmadhikari, F. A. Rajgara, N. C. S. Reddy, A. S. Sandhu, and D. Mathur, �??Highly efficient white light generation from barium fluoride,�?? Opt. Express 12, 695-700 (2004), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-4-695">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-4-695</a>
[CrossRef] [PubMed]

E. Hugonnot, M. Somekh, D. Villate, F. Salin, and E. Freysz, �??Optical parametric chirped pulse amplification and spectral shaping of a continuum generated in a photonic band gap fiber,�?? Opt. Express 12, 2397 �?? 2403 (2004), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-11-2397">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-11-2397</a>
[CrossRef] [PubMed]

Pei-Lin Hsiung, Yu Chen, Tony H. Ko, James G. Fujimoto, C. J. S. de Matos, S. V. Popov, J. R. Taylor, and V. P. Gapontsev, �??Optical coherence tomography using a continuous-wave, high-power, Raman continuum light source, �??Opt. Express 12, 5287 - 5295(2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-22-5287">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-22-5287</a>
[CrossRef] [PubMed]

Opt. Lett. (3)

Phys. Rev. (1)

R. G. Brewer, J. R. Lifsitz, E. Garmire, R. Y. Chiao, and C. H. Townes, �??Small-scale trapped filaments in intense laser beams,�?? Phys. Rev. 166, 326�??331 (1968).
[CrossRef]

Phys. Rev. Lett. (3)

A. Brodeur and S. L. Chin, �??Band-gap dependence of the ultrafast white light continuum,�?? Phys. Rev. Lett. 80, 4406�??4409 (1998).
[CrossRef]

P. B. Corkum, C. Rolland, and T. Srinivasan Rao, �??Supercontinuum generation in gases,�?? Phys. Rev. Lett. 57, 2268�??2271 (1986).
[CrossRef] [PubMed]

R. R. Alfano and S. L. Shapiro, �??Observation of self-phase modulation and small-scale filaments in crystals and glasses,�?? Phys. Rev. Lett. 24, 592-594 (1970).
[CrossRef]

Other (3)

R. R. Alfano, The Supercontinuum laser source, Springer�??Verlag, Berlin (1989).

A. Yariv, Quantum Electronics, John Wiley & Sons, New York, USA, 1988.

V. G. Dimitriev, G. G. Gurzaddyan, and D. N. Nikogosyan, Handbook of Nonlinear Optical Crystals, 2nd revised ed. (Springer, Berlin, 1977).

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Figures (5)

Fig. 1.
Fig. 1.

The left panel shows the supercontinuum generated at the phase matching angle of KDP crystal and the right panel at an angle far away from phase matching angle. The figures are as seen on a white screen. The blue color in the left panel is due to the emission from the screen due to SHG.

Fig. 2.
Fig. 2.

Dispersion and Spectrum measured away from phase matching angle of the generated supercontinuum (after attenuating the pump beam with an IR filter).

Fig. 3.
Fig. 3.

Evolution of the SHG and SCG as we rotate the crystal towards the phase matching angle (Here 0° refers to phasematching angle and the angular variation is measured with respect to it).

Fig. 4.
Fig. 4.

Dispersion and Spectrum measured θ=-55° away from phase matching angle of the generated supercontinuum (after attenuating the pump beam with an IR filter).

Fig. 5.
Fig. 5.

Young’s double slit fringes with a slit separation of ~0.25 mm and ~80 µm slit width.

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