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Narrow band optical filter in fluorescein doped boric acid glass saturable absorber thin films |
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| Authors: | Ramesh C Sharma Thomas A Waigh |
| Institution: | a Biological Physics, Department of Physics and Astronomy and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom b Institute for Clean Energy Technology, Mississippi State University, 205 Research Boulevard, Starkville, MS 39759-7704, USA |
| Abstract: | We demonstrate narrow band optical filter like frequency response with full width half maximum (FWHM) of nearly (1.75 ± 0.25) Hz in fluorescein doped boric acid glass films 10−4 M], using modulated optical phase conjugation and a nearly non-degenerate four wave mixing technique. Modulated optical phase conjugation signals are described in the limit of a weak probe and relatively strong pump beams. Both pump beams are of nearly equal intensity at a wavelength of 514.5 nm from a continuous-wave Ar+ laser. The probe beam frequency has been detuned with a ramp signal using a piezo electric mirror. |
| Keywords: | Nonlinear optics Nearly non-degenerate four wave mixing Laser materials Spatial filtering Optical devices Modulated optical phase conjugation Active piezo mirror |
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