Towards a Laser System as long as Atom Interferometry Andrew Chew Content Overview of r
Dibbell, Julian, Contributing Editor has reference to this Academic Journal, PHwiki organized this Journal Towards a Laser System as long as Atom Interferometry Andrew Chew Content Overview of related Theory Experimental Setup: Laser System Frequency Stabilization Characterisation of realized Lasers Outlook Atom Interferometry Similar to Light Interferometry Atoms replace role of the light. Atom-optical elements replace mirrors in addition to beam splitters
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Motivation Light Interferometry is used to make inertial sensors but the long wavelength limits the resolution of the phase measurement. The atomic de Broglie wavelength is much shorter in addition to thus allows as long as greater resolution of the phase measurement. Atoms have mass in addition to thus we can make measurements of the as long as ces exerted on them. An example would be the measurement of the gravitation as long as ce. Raman Transitions Stimulated Raman Transitions result in the super position of e in addition to g states Two phase-locked Lasers of frequency 1 in addition to 2 are used to couple the g,p in addition to i,p+ k1 states, in addition to the e, p + (k1-k2) in addition to i states respectively. A large detuning suppresses spontaneous emission from the intermediate i,p+ k1 state. The ground states are effectively stable.
Ramsey-Bordé Interferometer A sequence of /2, in addition to /2 Raman pulses 1st /2 pulse acts a beam splitter: Places the atomic wave in a superposition of g,p in addition to e, p + keff states pulse acts a mirror: Flips the g,p to the e, p + keff states in addition to vice versa 2nd /2 pulse acts a beam splitter: Projecting the atoms onto the initial state. Laser System Extended Cavity Diode Laser (ECDL) design used by Gilowski et. al in Narrow b in addition to width interference filter-stabilized diode laser systems as long as the manipulation of neutral atoms. Optics Communications, 280:443-447, 2007. 3 Master Oscillator Power Amplifier (MOPA) systems as long as each wavelength, each consisting of an ECDL as the seeder in addition to a Tapered Amplifier as the amplifier. One MOPA is as long as cooling, another as long as Raman lasers in addition to last as long as the repumper beam Experimental Setup Laser system as long as Rubidium consisting of cooling in addition to repumper lasers as long as preparation of atomic cloud. Raman laser system as long as atom interferometry. Laser system as long as imaging in addition to detection of internal atomic states. 1 set of laser systems as long as each individual species of atoms used as long as interferometry
ECDL Design Cavity Length Defined by the distance between the laser diode in addition to the cavity mirror/output coupler. Output coupler mounted on a piezo-electric transducer which is partially transmitting in addition to reflecting. Inside the cavity, the emitted laser beam is collimated using a collimating lens, in addition to then focused onto the output coupler, as long as ming a very stable angular insensitive cavity. DFB laser diode which promises narrow linewidth is used Laser Operation Tuning of wavelength by changing Laser diode current (Fast MHz time scale) Cavity length (acoustic time scale, kHz) Temperature (Hz time scale) Lasers
Fabry Perot ECDL Littrow ECDL Laser Characterization Heterodyne 2 lasers to obtain their beat note in a optical setup shown below Linewidth of the beat note corresponds to: We need 3 lasers in addition to beat each one with each other to obtain a system of 3 simultaneous equations
Laser Characterization We will beat 3 lasers: 1 ECDL laser using a DFB ECDL, an Edge Emitting ECDL in addition to a Littrow ECDL laser Beat Note DFB ECDL in addition to Edge Emitting ECDL Beat Linewidth: 0.4775 +/- 0.0300 MHz Sweep Rate: 30ms B in addition to width: 30KHz DFB ECDL in addition to Littrow ECDL Beat Linewidth: 0.4910 +/- 0.0276 MHz Sweep Rate: 30ms B in addition to width: 30KHz
Beat Note Edge Emitting Diode in addition to Littrow ECDL Beat Linewidth: 0.5295 +/- 0.0356 MHz Sweep Rate: 30ms B in addition to width: 30KHz Results Analysis The Spectrum Analyzer was set to have a fast sweep rate setting of 30ms as the free running DFB in addition to Fabry Perot ECDL have a slow frequency drift of a few MHz within 100ms timescale. A more ideal setup would require all 3 lasers locked to an atomic reference during the measurement. The DFB ECDL, as expected, has the narrowest linewidth of all the 3 lasers
Outlook The Laser system is characterized in addition to we will now proceed to build the tapered amplifier to as long as m the MOPA system. 2 other MOPAs will also be constructed Vacuum system as long as experiment will be constructed. We want to do inertial measurements by year-end. Laser system as long as the second atomic species will also need to be set up in addition to characterized.
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