RTP (rubidium titanyl phosphate - RbTiOPO4), is a very desirable crystal material for electro-optic modulators and Q-switches. It combinesseveral features of KD*P and Lithium Niobate andhas one major advantage over both: RTP exhibits virtually no piezo-electric effect with electrical signals between DC and 100 kHz. There is no ringing superimposed on the transmitted optical beam passing through the crystal. Modulators and Q-switches made with RTP can be utilized with high power lasers operating at high repetition rates.
Freedom from piezoelectric ringing enables the use of RTP devices in high repetition rate mode locked laser pulse extraction, laser pulse slicing, chopping and gating systems as well as in Q-switching applications. Tests conducted at up to 100 kHz reveal no ringing in the optical waveform.
RTP has a useful optical wavelength range from 350 nm to 4300 nm. Transmittance, in the 400 to 1100 nm range, with hard, “V” type high efficiency Anti-Reflection coatings is 98.5%. Standard AR wavelengths, at the present time, are 1064 nm and 700-900 nm. A-R coatings for other wavelengths are available.