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The theory of laser regeneration switching is developed. The rate equations are derived and, using ruby as an example, the material-cavity parameters are evaluated for a 1-cm3 rod. Steady-state solutions for t<0 are given, and the equations formally integrated for t>0. Using approximate solutions, three modes of laser operation, other than the normal mode, are discussed. With the first mode: the pulsed reflection mode (PRM) switched to minimum coupling, output pulses with peak powers of 17 MW and 10 nsec duration are predicted, with 2% of the initially stored energy emitted. With the second mode: the PRM switched to critical coupling, peak powers of 170 MW with pulse durations of about 8 nsec, and with about 50% of the stored energy emitted, are predicted. In the third mode: the pulsed transmission mode (PTM), peak powers of about 900 MW, pulse durations around one nsec, with 52% of the stored energy emitted, are predicted. Experimental approaches to PTM operation are briefly discussed.

The disagreement appears to be greater than our experimental error.A direct comparison can be made of the values of d \ny/d InF which are obtained, first, by direct calculation, and second, by the use of this requirement. Equation (1) can be rewritten in reduced form asThe requirements of simple similarity imply that the dimensionless quantity in the brackets must remain unchanged by variations in the pressure (or volume). This can be expressed as, d \ny/d lnF = l+2d lnH 0 /d \nV-2d lnT c /d InF. (9) The value of d Iny/d \nV which can be calculated from Eq. (9) and our experimental data [2.4(±0.7)] is significantly higher than the directly calculated [Eq.The paramagnetic resonance spectrum of Mn 2+ in CdW04 was measured at 34 kMc/sec at room temperature. The spectrum can be described by the spin Hamiltonian, 5C=g/3H-S+Z>[6 , z 2 +|5(5+l)]+£(5 a; 2 -V)+^I-S, with g,=2.001, &=» 2.003, &,= 1.997, \D\ =5.153 kMc/sec, \E\ =1.395 kMc/sec,\A Z \ =0.246 kMc/sec, \A X \ =0.242 kMc/sec, \A y \ =0.259 kMc/sec, 5=5/2, and 7=5/2. PARAMAGNETIC RESONANCE OF Mn IN CdW0 4

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