Soliton self-frequency shift (SSFS) in a photonic crystal fiber (PCF) pumped by a long-cavity mode-locked Cr:forsterite laser is integrated with second harmonic generation (SHG) in a nonlinear crystal to generate ultrashort light pulses tunable within the range of wavelengths from 680 to 1800 nm at a repetition rate of 20 MHz. The pulse width of the second harmonic output is tuned from 70 to 600 fs by varying the thickness of the nonlinear crystal, beam-focusing geometry, and the wavelength of the soliton PCF output. Wavelength-tunable pulses generated through a combination of SSFS and SHG are ideally suited for coherent Raman microspectroscopy at high repetition rates, as verified by experiments on synthetic diamond and polystyrene films.
© 2012 Optical Society of AmericaFull Article | PDF Article
Dmitrii A. Sidorov-Biryukov, Evgenii E. Serebryannikov, and Aleksei M. Zheltikov
Opt. Lett. 31(15) 2323-2325 (2006)
A. A. Ivanov, A. A. Podshivalov, and A. M. Zheltikov
Opt. Lett. 31(22) 3318-3320 (2006)
Esben Ravn Andresen, Carsten Krogh Nielsen, Jan Thøgersen, and Søren Rud Keiding
Opt. Express 15(8) 4848-4856 (2007)