The Lunar Orbiting Laser Altimeter (LOLA) will fly on the Lunar Reconnaissance Orbiter (LRO). The laser is based upon the one in the Mercury Laser Altimeter (MLA). LOLA will fly two lasers instead of one in the laser cavity. The MLA laser has a six year flight to station

Ramsey, W. Lawrence

Rosecrans, Glenn

NASA Technical Reports Server

Source of Acquisition 
NASA Goddard Space Flight Center 
a New F 
for the LOLA Laser Cavity 
W. Lawrence Ramsey , NASA,GSFC 
enn Rosecrans , SGT ,GSFC 
https://ntrs.nasa.gov/search.jsp?R=20070035099 2019-08-30T01:54:39+00:00Z
The Lunar Orbiting Laser Altimeter (LOLA) will 
fly on the Lunar Reconnaissance Orbiter (LRO). 
The laser is based upon the one in the Mercury 
Laser Altimeter (MLA) . 
LOLA will fly two lasers instead one in laser 
cavity. 
The MLA aser has a six year flight to station. 
Lasers can fire in air with 0 2  present. 
During testing and on orbit, LOLA wil 
in vacuum. 
* The laser cavity must be sealed against 
molecular and particulate contaminants. 
Mission to Moon wi start with 60 days of 
Ouralshs ]ua~ ayl a]~n@~a-a~ o] apem SBM UOTST~~P . 
Drawing o MLA Fi 
Proposed So 
* To prevent cross contamination, put a fence 
between lasers. 
* Clean the parts and reduce outgassing more than 
MLA. 
* Prevent known "bad" laser materials from being 
used. 
* Increase venting rate, add more vents, and change 
locations. 
ions Chosen 
Convened expert panel. 
Eliminated changes in Be housing. 
Redesign metal filter vent hole. 
Clean NVR to A13 instead of A12. 
Use and RGA to ensure that bad compounds 
are gone - Principa y: Silicones and 
Design o New Ven gassing 
Insert graph of MLA venting showing 
ow outgassing 
gassing Con 
Insert Graph of proposed changes. 
New 
FARMINGTON, CT 06332 1 803-269-6688 
design 
.is' OF &dAiEAML 
:Y K t 1  FAYF iW91 Or- S~CW~O-~F~ELFCLFC~~ Li7 R %%LZ iPnimS TOLERANCES: , / ,, ,-, Goddard Space Flight Center WWWL~. u r w o  / . . --. - .  - -  PRELIM I NAF, , , ,,,, ., , xx xxx L F R A ~ T I ~ ~ ~  ,, I
..... .. 
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FOR €NGIN€€RING : -A%r li Rces A<l iky Cirir il C 
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INFORMATION ONLY s wcVr; En I#' E*.VFtO C rn *mas jc" LC" r..a 5 1'5, +?Cv:*' 
ca. Fr,:. ?< " 
CRewW i*rTERffiEiiU .?ER CSFC-1673-64-I 
-- 
nTLE 
im  l5rn [.'a l rrkf ......  FILTER ASSEMBLY . 
.. ... .*SFB 1rOlS ii WELDMENT 
LOLA 
New design Con 
Flight filter profile 
Fliter base showing Mott 
Sintered metal filter cup and 
"Om ring cavity. 
ing New Design 
Compare outgassing rates to tests performed 
during MLA. 
Since MLA filters arrived clean no cleaning 
was necessary. Came direct from sintering 
furnace. 
New filters undergo machining and welding. 
Test of workmanship and cleaning technique. 



Insert video of test. 
LO PRESS CYL TORR 
1- LO PRESS CYL TORR ~ 
Begin with 2% Simple Green in DI water @ 40C 
in ultrasonic cleaner. 
Follow with just DI. Then rinse with Isopropyl 
Alcohol (IPA) Dry w/N2. 
Place part in 50:50 solution of IPA and Acetone 
@ 40C and ultrasonic cleaner. 
Rinse wlhexane take NVR sample and dry w/ N2. 
Place in oven at 550C for 1 hour. 

*aSvurvp alqrsrh ON 
* ysv alqrsrA . ON 
.anIq loo:, v $no sauro3 
Ready r LOLA 
Beam Expander 
Receiver Telescope 
1 I 
Laser Cavity 
Vent 
Aft optics 


Development of a New Flight Vent for the LOLA Laser Cavity

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