M. Vainio

Publications (3)2.19 Total impact

• Article: Cavity-enhanced optical frequency doubler based on transmission-mode Hänsch–Couillaud locking

  M. Vainio, J. E. Bernard, L. Marmet
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  ABSTRACT: A variant of the Hänsch–Couillaud technique for locking the pump laser frequency to a cavity-enhanced optical frequency doubler is presented. In contrast to the original scheme in which the pump laser light reflected by the enhancement cavity is monitored, the error signal for locking is obtained by polarization analysis of the light transmitted by the cavity. The cavity serves as a spectral and spatial filter for the pump beam, making the transmission-mode locking method particularly useful if the beam quality is poor. Experimental validation of the method is demonstrated by generating more than 190mW of stable 461nm light from a cavity-enhanced frequency doubler that is pumped by a diode laser system.
  Applied Physics B 04/2012; 104(4):897-908. · 2.19 Impact Factor
• Source

  Available from: nrc-cnrc.gc.ca

  Conference Proceeding: Recent progress on the NRC 88Sr+ single-ion optical frequency standard

  P. Dube, A.A. Madej, J.E. Bernard, G. Humphrey, M. Vainio, J. Jiang, D.J. Jones
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  ABSTRACT: We report our recent progress made with the NRC ⁸⁸Sr⁺ single-ion optical frequency standard. The long-term operation of the standard was improved by actively stabilizing the cooling, repump and clearout laser sources, and by using a femtosecond fiber laser frequency comb to link the probe laser frequency to the microwave time standards. With the femtosecond fiber comb, we have demonstrated continuous operation for a period of eight days and continuous measurement of the probe laser source for three days. Micromotion shifts have been the dominant source of uncertainty in our rf Paul trap because laser beam access is only possible along one axis in the current design. With the aim of reducing to a minimum these shifts, we have constructed an endcap trap designed for minimization of micromotion along three orthogonal axes. We report on the successful trapping of single ions with this endcap trap. Since electrode contamination during trap loading can also induce micromotion shifts as a result of evolving patch potentials, we have increased the trap loading efficiency with photo-ionization.
  Frequency Control Symposium (FCS), 2010 IEEE International; 07/2010
• Article: Recent Progress on the NRC 88Sr+ Single-Ion Optical Frequency Standard

  P. Dubé, A. A. Madej, J. E. Bernard, G. Humphrey, M. Vainio, J. Jiang, D. J. Jones
  [show abstract] [hide abstract]
  ABSTRACT: We report our recent progress made with the NRC 88Sr+ single-ion optical frequency standard. The long-term operation of the standard was improved by actively stabilizing the cooling, repump and clearout laser sources, and by using a femtosecond fiber laser frequency comb to link the probe laser frequency to the microwave time standards. With the femtosecond fiber comb, we have demonstrated continuous operation for a period of eight days and continuous measurement of the probe laser source for three days. Micromotion shifts have been the dominant source of uncertainty in our rf Paul trap because laser beam access is only possible along one axis in the current design. With the aim of reducing to a minimum these shifts, we have constructed an endcap trap designed for minimization of micromotion along three orthogonal axes. We report on the successful trapping of single ions with this endcap trap. Since electrode contamination during trap loading can also induce micromotion shifts as a result of evolving patch potentials, we have increased the trap loading efficiency with photo-ionization. yes yes