frequency doubling with nd:yag laser
DESCRIPTION
Tony Hyun Kim, Ilan F. Almog 12/9/2008 6.161 Modern Optics Lab Project. Frequency Doubling with Nd:YAG laser. Topics to be discussed. Nd:YAG laser restoration Principles of operation Repair of the cooling system, replacement of filter Fixing the deionizer cartridge - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/1.jpg)
Frequency Doubling with Nd:YAG laserTony Hyun Kim, Ilan F. Almog12/9/20086.161 Modern Optics Lab Project
![Page 2: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/2.jpg)
Topics to be discussed1. Nd:YAG laser restoration
1. Principles of operation2. Repair of the cooling system, replacement of filter3. Fixing the deionizer cartridge4. Replacement of pumping lamp
2. Frequency-doubling experiment1. Brief theory2. Experimental setup; sources of error3. Results and conclusion
![Page 3: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/3.jpg)
Image source: http://www.mrl.columbia.edu/ntm/level1/ch05/html/Image437.jpg
Nd:YAG – Principles of operation
Nd:YAG crystal has infrared (1064nm) line. Inversion achieved by Kr flash lamp. System (lamp) must be water cooled.
![Page 4: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/4.jpg)
Our Nd:YAG, the Quantronix 116 Insights from
previous repair attempts…
Plumbing issues: Various leaks Water filter too old
Laser head: Lamp malfunction
![Page 5: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/5.jpg)
6.162: Modern Plumbing Laboratory
![Page 6: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/6.jpg)
6.162: Modern Plumbing Laboratory
Two system-side (water) circuits: Left: Cools the laser Right: Self-cleans the water supply
Water filter was easily replaced, but…
![Page 7: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/7.jpg)
Deionizer cartridge fiasco
FromPum
p
ToReservo
ir
![Page 8: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/8.jpg)
Deionizer cartridge fiasco
![Page 9: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/9.jpg)
Deionizer cartridge: Solution
Tubes, clamps and epoxy No leaks; perfect operation
![Page 10: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/10.jpg)
Replacement of the pump lamp
Suspicion of malfunctioning lamp confirmed With plumbing and lamp fixed, laser operates!
![Page 11: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/11.jpg)
![Page 12: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/12.jpg)
Conclusions (Nd:YAG repair) No known leaks. Have established protocols for
maintenance: Refilling the reservoir. Wetting the pump for initial run. Pump electrical reset, and…
Observed up to 14W of IR power
![Page 13: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/13.jpg)
![Page 14: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/14.jpg)
Freq. doubling introduction
E2 term in polarizability (e.g. KDP crystal)
Double 1064nm (IR) Obtain 532nm (green)
Our experiment: Characterize the conversion efficiency as a function of input power.
Nonlinear crystalIncident
IR
![Page 15: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/15.jpg)
Experimental setup
Use dispersion of glass to achieve separation of IR (shown red) and green beams;
Can measure power of green beam only!
![Page 16: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/16.jpg)
Experimental setup
Use pick-off mirror to measure input IR power without disturbing other optics
![Page 17: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/17.jpg)
Experimental setup
![Page 18: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/18.jpg)
Generation of green light by freq. doubling with Quantronix 116
![Page 19: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/19.jpg)
Conclusions (Freq. doubling) Observed frequency doubling using
the newly-repaired Quantronix Nd:YAG laser.
Based on our alignment, obtained ~5.2% conversion efficiency. Efficiency independent of input IR power
![Page 20: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/20.jpg)
Concluding remarks
Showed that Nd:YAG system and KDP crystal are functional. Opens possibilities for future experiments.
![Page 21: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/21.jpg)
Acknowledgments
Mike the plumber; Dave the optics guy; The folks who shared the optics lab
with us That is: Americo, Amrita, Matt,
(Raymond); And, of course, Bill (and Prof. Warde)
![Page 22: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/22.jpg)
![Page 23: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/23.jpg)
![Page 24: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/24.jpg)
![Page 25: Frequency Doubling with Nd:YAG laser](https://reader035.vdocuments.site/reader035/viewer/2022081422/56816357550346895dd40678/html5/thumbnails/25.jpg)