Question

2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r 0.9 The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch for a 9mm (w) x9mm(h) x25mm (I) Li:Nb03 crystal where the phase retardation between the by: components given IS 2T For LiNb03 in question 1: nx- no22Eyand ny - no Where h is the hight and l is the length of the crystal. Also calculate the quarter wave voltage d) Assuming the laser output has an average power of 1W and repetition rate 1kHz with a pulse duration of 10ns, what is the peak power and what is the power after a time equal to the cavity oss time?

Answer 1

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