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Enhancing red-shifted white-light continuum generation in optical fibers for applications in nonlinear Raman microscopy

Georgi I. Petrov and Vladislav V. Yakovlev

Open Access Open Access

Abstract

We report an efficient red-shifted continuum generation of picosecond pulses in conventional optical fibers. By using a novel high-repetition rate, high-energy oscillator operating at the fundamental wavelength of 1064 nm, we achieved more than 60% of the output energy in the spectral range from 1150 to 1300 nm, perfectly suitable for broadband coherent anti-Stokes Raman spectroscopy.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Laser set up. DL-diode laser, ND-Nd3+:YVO4 crystal, Ge/Si-mixed Ge/Si photodetector, SP-spectrometer, F-Faraday isolator, NLC-nonlinear optical crystal, AC-autocorrelator, AL-aspheric lens, 1-flat mirror (HR @ 1064 nm, HT @ 808 nm), 2-concave mirror (R=0.5 m; HR @ 1064 nm), 3-concave mirror (R=2.0 m; HR @ 1064 nm), 4-concave mirror (R=0.3 m; HR @ 1064 nm), 5-flat output coupler (HR @ 532 nm, T=78% @ 1064 nm). For simplicity a laser resonator with a single pass through the telescopic optics (3) is shown.

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Fig. 2.
Fig. 2. The development of the spectrum of white-light continuum generated in a 3-m-long GeO2 fiber as a function of the input energy.

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Fig. 3.
Fig. 3. The relative delay of arrival times of different spectral components of white-light continuum generated in a 3-m-long GeO2 fiber.

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Fig. 4.
Fig. 4. Broadband resonant CARS spectrum of a single 0.5-mm-diameter polystyrene sphere recorded under microscopic conditions.

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Equations (1)

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Δ ω ( t ) = ω 0 n 2 · L c d I ( t ) d t ,
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