deletions | additions       diff --git a/subsection_Parametric_Oscillator_An_optical__.tex b/subsection_Parametric_Oscillator_An_optical__.tex  index 75ff605..4e08630 100644  --- a/subsection_Parametric_Oscillator_An_optical__.tex  +++ b/subsection_Parametric_Oscillator_An_optical__.tex 
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A special case is when the idler and signal frequencies are degenerate.  \[\omega_s = \omega_i = \omega_p/2\]  Our setup is doubly resonant, meaning that the pump, signal and idler frequencies are all a multiple of the base frequency of the resonator.  \[\omega_0 = frac{c}{nL}\] \frac{c}{nL}\]  The generated frequency can be tuned by changing the phase-matching conditions of the OPO, thus making the OPO a source of tunable radiation, also, as explained in the next section, the light produced is "squeezed" and useful for various purposes.   
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