A 461 nm laser system and hollow-cathode lamp spectroscopy for magneto-optical trapping of Sr atoms

Takatoshi Aoki, Kotaro Umezawa, Yuki Yamanaka, Naotomo Takemura, Yasuhiro Sakemi, Yoshio Torii

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We develop a laser system with a wavelength of 461 nm and a power of 175 mW using a master oscillation power amplifier (MOPA) system and second-harmonic generation (SHG) via a KNbO 3 crystal. To stabilize the laser frequency to the atomic absorption line, we measured the saturated absorption spectrum of a Sr hollow-cathode lamp. The dependences of the Lamb dip signal and the frequency modulation spectrum on the pump beam power were observed. The collision broadening due to the Ne buffer gas increased the observed width of the signals in addition to the saturation effect. In spite of such an increased width (∼100 MHz), we demonstrated stable magneto-optical trapping of Sr atoms. The number of atoms obtained, 1 × 10 7, is sufficient to proceed to various ultracold Sr atoms experiments.

Original languageEnglish
Article number034401
Journaljournal of the physical society of japan
Volume81
Issue number3
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Bose-Einstein condensation
  • Frequency modulation spectroscopy
  • Hollow-cathode lamp
  • Laser cooling and trapping
  • Laser spectroscopy
  • Quantum degenerate of mixture
  • Second harmonic generation
  • Strontium
  • Tapered amplifier

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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