Details of Grant 

EPSRC Reference:	EP/M508287/1
Title:	COALESCe - COmpAct Light Engines for Strontium Clocks
Principal Investigator:	Hastie, Professor J
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Department:	Inst of Photonics
Organisation:	University of Strathclyde
Scheme:	Technology Programme
Starts:	01 May 2015	Ends:	31 October 2016	Value (£):	15,313
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Summary on Grant Application Form
A large number of applications, including those in research, defence, and finance require compact optical clocks that retain their accuracy and reliability for lower costs and footprints than existing systems. Optical clocks are capable of better stability and lower uncertainty than the current standard of time; however, each clock requires a range of lasers with demanding requirements specific to the atomic species at the heart of the clock. Neutral strontium is one of the most widely used atoms. It has a key transition that must be addressed using a laser source with emission wavelength at 461nm, power >1W and linewidth (spectral purity) <32MHz. Currently researchers must use expensive or inadequate laser sources to meet these requirements. In this project we will meet all the above requirements of neutral strontium in a low cost, compact system based on semiconductor disk laser (SDL) technology. The advantageous properties of SDLs for tunable, narrow linewidth operation have previously been demonstrated in the laboratory; however, their potential to address wavelengths of interest for optical clocks, and moreover to achieve this in a compact commercial format, have yet to be realised. We will engineer a stabilised, narrow linewidth 922nm SDL with frequency doubling to 461nm within the cost and volume parameters required for strontium optical clock-based systems to emerge from the research laboratory and address applications in the field.
Key Findings
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Organisation Website:	http://www.strath.ac.uk