All-diode-laser cooling of Sr+ isotope ions for analytical applications. (23rd May 2017)

• Record Type: Journal Article
• Authors: Jung, Kyunghun; Yamamoto, Kazuhiro; Yamamoto, Yuta; Miyabe, Masabumi; Wakaida, Ikuo; Hasegawa, Shuichi
• Is Part Of: Japanese journal of applied physics. Volume 56:Number 6(2017)
• Publication Date: 2017-05-23
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.56.062401
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Trapping and cooling of Sr + isotope ions by an all-diode-laser system has been demonstrated in order to develop a novel mass spectrometric technique in combination with ion trap-laser cooling. First, we constructed external cavity diode lasers and associated stabilization apparatus for laser cooling of Sr + ions. The transition frequencies confirmed by optogalvanic spectroscopy enabled successful cooling of 88 Sr + ions. An image of two trapped ions has been captured by CCD camera. Minor isotopes, 84 Sr + and 86 Sr +, were also cooled and trapped. From an analysis of the observed spectra of a string crystal of each isotope, the isotope shifts of the cooling transition (5s 2 S1/2 → 5p 2 P1/2 ) of Sr + ions were determined to be +371(8) MHz for Δν 84–88 and +169(8) MHz for Δν 86–88 . In the case of the repumping transition (4d 2 D3/2 → 5p 2 P1/2 ), Δν 84–88 and Δν 86–88 were measured to be −833(6) and −400(5) MHz, respectively. These values are in good agreement with previously reported values.