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David Notebook: Difference between revisions
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==Daily Log==
'''8/15/14'''
Deniz can calculate the maximum theoretical conversion efficiency of 780 if we know the amount of 1064 and 1555 in the cavity. I separated the beams with a prism and measured 5 mW maximum of 1064 when locking and 14 mW maximum of 1555. The prism (Thorlabs PS853) has a listed transmittance of ~28% for both 1064 and 1555, so exiting the cavity there should be 17.9 mW of 1064 and 50 mW of 1555. ▼
The cavity mirror transmits 32 ppm and 38 ppm of 1064 and 1555 respectively, so that puts the powers at 559 W and 1316 W inside the cavity. The beam sizes were both about 1700 μm 30 cm from the cavity, so their intensities are approximately: ▼
<math> 770 </math> <math> MW/cm^2 </math> and <math> 1810 </math> <math> MW/cm^2 </math>▼
I'm skeptical of the prism transmission figure, since I haven't observed losses like that. I'll check directly tomorrow when the cavity is aligned. The bandpass filter lets through ~65% 1555 and blocks almost all 1064.
'''8/4/14'''
New efficiency measurement is <math> 5.5*10^{-7} </math> In addition to walking the 780 beam, I also slightly adjusted its polarization and the focus of the a-sphere on the output fiber launch, both of which slightly improved efficiency.
▲Deniz can calculate the maximum theoretical conversion efficiency of 780 if we know the amount of 1064 and 1555 in the cavity. I separated the beams with a prism and measured 5 mW maximum of 1064 when locking and 14 mW maximum of 1555. The prism (Thorlabs PS853) has a listed transmittance of ~28% for both 1064 and 1555, so exiting the cavity there should be 17.9 mW of 1064 and 50 mW of 1555.
▲The cavity mirror transmits 32 ppm and 38 ppm of 1064 and 1555 respectively, so that puts the powers at 559 W and 1316 W inside the cavity. The beam sizes were both about 1700 μm 30 cm from the cavity, so their intensities are approximately:
▲<math> 770 </math> <math> MW/cm^2 </math> and <math> 1810 </math> <math> MW/cm^2 </math>
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