Thanh Le
Jet Propulsion Laboratory
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Thanh Le.
international frequency control symposium | 2001
Shouhua Huang; Lute Maleki; Thanh Le
A 10 GHz optoelectronic oscillator (OEO) with continuous frequency tunability and low phase noise is presented. By means of coarse tuning (selecting different RF filter) and fine tuning (tuning control voltage of phase shifter), we demonstrated the OEO can operate at any frequency on X-band (/spl sim/10 GHz, and any frequency. on the interested frequency range up to at least 45 GHz) with very low phase noise.
international frequency control symposium | 2003
John Prestage; Sang Chung; Thanh Le; Maggie Beach; Lute Maleki; Robert L. Tjoelker
We describe the development of a small Hg/sup +/ ion clock suitable for space use. A small clock occupying 1-2 liters volume and producing stability of 10/sup -12///spl radic//spl tau/ would significantly advance the state of space-qualified atomic clocks. Based on recent measurements, this technology should produce long-term stability as good as 10/sup -15/.
Proceedings of SPIE | 2013
Nan Yu; Thanh Le; Steven J. Schowalter; Wade G. Rellergert; Justin Jeet; Guoping Lin; Eric R. Hudson
We report the first demonstration of a UV laser using a high-Q whispering gallery mode (WGM) resonator of Ce3+: LiCaAlF6. We show that WGM resonators from LiCaAlF6 can achieve a Q of 2.6 x 107 at UV. We demonstrated a UV laser at 290 nm with a pulsed pump laser at 266 nm. The experiments showed the low pump threshold intensity of 7.5 x 109 W/m2 and slope efficiency of 25%. We have also observed lasing delay dynamics. These results are consistent with our modeling and theoretical estimates, and pave the way for a low threshold cw UV laser using WGM resonator cavity.
Proceedings of SPIE | 2007
John Prestage; Sang K. Chung; Lawrence Lim; Thanh Le
We have recently completed a breadboard ion-clock physics package based on Hg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture we have demonstrated short-term stability ~1-2x10-13 at 1 second, averaging to 10-15 at 1 day. This development shows that H-maser quality stabilities can be produced in a small clock package, comparable in size to an ultra-stable quartz oscillator required for holding 1-2x10-13 at 1 second. This performance was obtained in a sealed vacuum configuration where only a getter pump was used to maintain vacuum. The vacuum tube containing the traps has now been under sealed vacuum conditions for nearly two years with no measurable degradation of ion trapping lifetimes or clock short-term performance. We have fabricated the vacuum tube, ion trap and UV windows from materials that will allow a ~ 400°C tube bake-out to prepare for tube seal-off. This approach to the vacuum follows the methods used in flight vacuum tube electronics, such as flight TWTAs where tube operation lifetime and shelf life of up to 15 years is achieved. We use neon as a buffer gas with 2-3 times less pressure induced frequency pulling than helium and, being heavier, negligible diffusion losses will occur over the operation lifetime.
Proceedings of the 35th Annual Precise Time and Time Interval Systems and Applications Meeting | 2003
John D. Prestage; Sang Chung; Thanh Le; Maggie Beach; Lute Maleki; Robert L. Tjoelker
Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting | 2006
John D. Prestage; Sang Chung; Lawrence Lim; Thanh Le
Archive | 2015
Trejesh Bandi; John D. Prestage; Sang Chung; Thanh Le; Nan Yu
Proceedings of the 7th Symposium | 2009
John D. Prestage; Sang Chung; Robert J. Thompson; Paul Macneal; Thanh Le
Archive | 2009
Vladimir Iltchenko; Lute Maleki; Ying Lin; Thanh Le
Archive | 2008
Anatoliy A. Savchenkov; Vladimir Iltchenko; Andrey B. Matsko; Thanh Le; Nan Yu; Lute Maleki