A frequency-offset locked spectrometer has been used to study the saturated absorption spectra of iodine at 633 nm. The results show very high resolution and have a particularly accurate frequency scale. Three absorption lines have been studied in greater de!ail using curve fitting techniques. The laser system is described, including a novel resonant mirror mount.
We use high intensity nanosecond laser pulses of different wavelengths to modify thin-film coatings (silica and titania) on the surface of silicon. We find that films as thick as 1 micron can be removed from the surface in one shot with minor or no damage to the Si surface. We also find the accumulated effect of multiple pulse irradiation. Finally we report our preliminary results on phase transformations in titania films induced by high intensity laser.
Linewidth reduction of an extended cavity diode laser at 657 nm was accomplished by negative feedb&k to an intra-cavity ADP crystaL High resolution (170 kHz wide) saturated absorption signals were reccrded of the calcium intercombination line which is of interest for a frequency standard. The spectrum of the red 6p-9s cesium line in a magnetooptical cell trap was also investigated..
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