TY - JOUR
T1 - A 461 nm laser system and hollow-cathode lamp spectroscopy for magneto-optical trapping of Sr atoms
AU - Aoki, Takatoshi
AU - Umezawa, Kotaro
AU - Yamanaka, Yuki
AU - Takemura, Naotomo
AU - Sakemi, Yasuhiro
AU - Torii, Yoshio
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/3
Y1 - 2012/3
N2 - 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.
AB - 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.
KW - Bose-Einstein condensation
KW - Frequency modulation spectroscopy
KW - Hollow-cathode lamp
KW - Laser cooling and trapping
KW - Laser spectroscopy
KW - Quantum degenerate of mixture
KW - Second harmonic generation
KW - Strontium
KW - Tapered amplifier
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U2 - 10.1143/JPSJ.81.034401
DO - 10.1143/JPSJ.81.034401
M3 - Article
AN - SCOPUS:84858039739
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
M1 - 034401
ER -