Line width and inversion ratios of iron-doped rutile for optical maser application

Johnson, C. C.

Rouzer, L. E.

English

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I INASA CR OR TWX OR AD NUMBER1 
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LINE WIDTH AND IXKERSION RATIO 
OF IRON-DOPED RUTILE 
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One of the bas ic  limits on the broadband performance of  a TWM 
i s  the l i n e  width of the  act ive c rys t a l  used. To date  only two 
c rys t a l s  have been employed i n  p rac t i ca l  maser amplifiers,  t h z t  is, 
Ruby (Cr+3 - Al 0 ) and Ruti le  (Cr+3 - T i  02). 
advantage over Chromium doped r u t i l e  i n  t h a t  i t s  l i n e  width i s  approxi- 
mately twice t h a t  of r u t i l e ;  57 Mc vs.  27 Me. 
Ruby has a d i s t i n c t  2 3  
Recent /experiments with iron-doped r u t i l e  (Fe3+ T i  0 2 )  have 
shown t h a t  t h i s  material i s  excel lent  f o r  broadband maser appl icat ions.  
Optimum concentration s tudies  have resu l ted  i n  measured l i n e  widths of 
60 Me and inversion r a t i o s  i n  excess of 15:l. Figure 1 shows the 
experimental data taken a t  a center frequency of 4.0 gc. 
tests taken a t  other frequencies produced the  same l i n e  widths (60 Me) 
as t he  typ ica l  data  given i n  Figure 1. 
The addi t iona l  
Gnversion r a t i o s  were a l s o  calculated from the gain and paramag- I 
n e t i c  absorption da ta  taken over the frequency band of 2 . 9 - 4 . 1  gc. 
Inversion r a t i o s  averaged b e t t e r  than l5:l over the e n t i r e  b a n d 2  
Table 1 gives the experimental inversion r a t i o s  f o r  the data i n  
Figure 1. Table 2 shows the  inversion r a t i o  data  i n  the colllplete 
2.9 t o  4 . 1  gc band. Data from 3.5 gc t o  3.8 gc was not td ien  due 
t o  unava i l ab i l i t y  of an appropriate pumping source. I Net gains of 
20 db per  inch have been attained,with t h i s  material which i s  suf- 
f i c i e n t  for broadband application. 
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Line width and inversion ratio of iron-doped rutile

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