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Highly efficient white light generation from barium fluoride

A. K. Dharmadhikari, F. A. Rajgara, N. C. S. Reddy, A. S. Sandhu, and D. Mathur

Open Access Open Access

Abstract

We demonstrate highly efficient white light generation by focusing 45 fs long pulses of 800 nm laser radiation with 1 mJ energy onto a 10 cm long barium fluoride crystal. The entire wavelength band from 400–1000 nm was generated with efficiency greater than 40%. We also observe multiphoton absorption induced fluorescence in the crystal. By employing line focusing geometry at low intensity, we show that white light fringes are formed with a single laser beam, indicative of the coherent property of the white light that is produced.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. The left panel depicts the barium fluoride crystal used to generate white light. The white screen shows the continuum that is generated; this is shown more clearly in the right panel.

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Fig. 2.
Fig. 2. Typical spectrum of white light generated in BaF2. An actual photograph of the continuum is shown in Fig. 1. The narrow peak is the spectrum of the incident laser.

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Fig. 3.
Fig. 3. The left panel shows induced fluorescence (blue line inside the crystal) upon irradiation by 800 nm laser light. The right panel shows induced fluorescence that results from 266 nm excitation. No such excitation was observed in the case of incident radiation at 355 nm.

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Fig.4.
Fig.4. Typical interference pattern obtained from line focused white light continuum generated in BK-7 glass. The line pattern that is seen corresponds to the green component of white light. Similar fringe patterns are expected in measurements that use any large bandgap material that results in white light generation.

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