Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of the Physical Society of Japan

A 461 nm Laser System and Hollow-Cathode Lamp Spectroscopy for Magneto-Optical Trapping of Sr Atoms

T. Aoki, Kotaro Umezawa, Yuki Yamanaka, Naotomo Takemura, Y. Sakemi, Yoshio Torii

Published Feb 14, 2012• 9 citations
Publisher

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.

DOI
10.1143/jpsj.81.034401

Related papers

Simple laser stabilization to the strontium 88Sr transition at 707 nm

Matthew A. Norcia, James K. Thompson

We describe frequency stabilization of a laser at 707 nm wavelength using FM spectroscopy in a hollow cathode lamp. The laser is stabilized to the (88)Sr metastable (3)P2 to (3)S1 optical transition. The stabilized laser is utilized for laser-cooling and trapping of strontium atoms. We also briefly describe how the same hollow cathode lamp is used to simultaneously derive a polarization spectroscopy signal for stabilizing the blue-MOT laser at 461 nm.

arXiv:1510.04329•Review of Scientific Instruments•Feb 1, 2016•10 citations

Doppler-free spectroscopy of metastable Sr atoms using a hollow cathode lamp

Yusuke Hayakawa, Takumi Sato, Chika Watanabe +2 more

We report on the demonstration of Doppler-free spectroscopy of metastable Sr atoms using a hollow cathode lamp (HCL). We employed a custom Sr HCL, which is filled with a mixture of 0.5 Torr Ne and 0.5 Torr Xe as a buffer gas to suppress velocity changing collisions and increase the populations in all of the (5s5p)3PJ(J=0,1,2) metastable states. We performed frequency modulation spectroscopy for the (5s5p)3P0−(5s6s)3S1, (5s5p)3P1−(5s6s)3S1, (5s5p)3P2−(5s5d)3D2, and (5s5p)3P2−(5s5d)3D3 transitions with sufficient signal-to-noise ratios for laser frequency stabilization. We also observed the hyperfine transitions of (5s5p)3P2−(5s5d)3D3 of Sr87. This method would greatly facilitate laser cooling of Sr.

arXiv:1712.10156•Applied Optics•Feb 15, 2018•8 citations

A scalable laser system at 461 nm for laser cooling and trapping of Sr atoms

Gunjan Verma, Enlong Wang, Joep Assendelft +4 more

Abstract The realization of compact high-power narrow-linewidth laser sources in the visible range has been a long-standing interest for the atomic physics community, especially in the field of laser cooling and trapping of alkaline-earth and alkaline-earth-like atoms. We report a simple master-slave injection-locked laser system capable of generating 500 mW at 460.86 nm with a linewidth of 1.6 MHz to realize magneto-optical trapping of strontium atoms on the $$5s^{2} \ ^{1}\mathrm {S}_{0}-5s5p \ ^{1}\mathrm {P}_{1}$$ 5 s 2 1 S 0 - 5 s 5 p 1 P 1 transition. The master laser used is an external cavity diode laser built with an anti-reflection coated laser diode in a Littrow configuration and the slave laser is built with a recently launched single mode high power GaN laser diode. We characterized the frequency noise, injection stability, spectral purity and relative intensity noise of the laser system. The reported laser system is used routinely to produce $$10^7$$ 10 7 strontium atoms at a temperature of 10 mK in a magneto-optical trap. The laser system offers a prominent alternative to the existing frequency-doubled laser systems in terms of cost, design flexibility, electrical power consumption, ease of scaling, intensity stability, and frequency tunability. The proposed system is also an effective solution for space-based experiments where a laser system’s size, weight, and electrical power consumption are crucial design parameters.

Applied Physics B•May 16, 2022•7 citations

Accurate absolute measurement of trapped Cs atoms in a MOT

M.A. Talavera

A Cs-133 Magneto-Optical Trap (MOT) has been developed at the Time and Frequency Division of the Centro Nacional de Metrolog´ CENAM, in Mexico. This MOT is part of a primary frequency standard based on ultra-cold Cs atoms, called CsF-1 clock, under development at CENAM. In this Cs MOT, we use the standard configuration (ae + i ae i ) 4-horizontal 2-vertical laser beams 1.9 cm in diameter, with 5 mW each. We use a 852 nm, 5 mW, DBR laser as a master laser which is stabilized by saturation spectroscopy. Emission linewidth of the master laser is 1 MHz. In order to amplify the light of the master laser, a 50 mW, 852 nm AlGaAs laser is used as slave laser. This slave laser is stabilized by light injection technique. A 12 MHz red shift of the light is performed by two double passes through two Acusto-Optic Modulators (AOMs). The optical part of the CENAMs MOT is very robust against mechanical vibration, acoustic noise and temperature changes in our laboratory, because none of our diode lasers use an extended cavity to reduce the linewidth. In this paper, we report results of our MOT characterization as a function of several operation parameters such as the intensity of laser beams, the laser beam diameter, the red shift of light, and the gradient of the magnetic field. We also report accurate absolute measurement of the number of Cs atoms trapped in our Cs MOT. We found up to6 £ 10 7 Cs atoms trapped in our MOT measured with an uncertainty no greater than 6.4%.

•Jan 1, 2007•1 citation

Cooling and Trapping 88 Sr Atoms with 461 nm Laser

Shaokai Wang, Wang Qiang, Lin Yi-Ge +5 more

We report the experimental realization of a 88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm. The MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 22. The total laser power available in our experiment is about 300 mW. We have trapped 1.6 × 108 88Sr atoms with a 679nm and 707 nm repumping laser. The two repumping lasers enhance the trap population and trap lifetime by factors of 11 and 7, respectively. The 88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal.

Chinese Physics Letters•Sep 1, 2009•23 citations

The progress of strontium optical clock at NIM

Shaokai Wang, Qiang Wang, Bai-Ke Lin +8 more

We report the experimental realization of88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm and 689nm. The blue MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 44. We have trapped 1.6×10888Sr atoms with the use of 679nm and 707nm repumping laser. The88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal. The 689nm laser used in our experiment has a line width of about 200Hz. To optimize the transfer efficiency, the laser spectrum is broadened by frequency modulation technique to about 2 MHz. The transfer efficiency from blue MOT to red MOT is about 20%.

European Frequency and Time Forum•Apr 1, 2010•0 citations
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.
We report on the demonstration of Doppler-free spectroscopy of metastable Sr atoms using a hollow cathode lamp (HCL). We employed a custom Sr HCL, which is filled with a mixture of 0.5 Torr Ne and 0.5 Torr Xe as a buffer gas to suppress velocity changing collisions and increase the populations in all of the (5s5p)3PJ(J=0,1,2) metastable states. We performed frequency modulation spectroscopy for the (5s5p)3P0−(5s6s)3S1, (5s5p)3P1−(5s6s)3S1, (5s5p)3P2−(5s5d)3D2, and (5s5p)3P2−(5s5d)3D3 transitions with sufficient signal-to-noise ratios for laser frequency stabilization. We also observed the hyperfine transitions of (5s5p)3P2−(5s5d)3D3 of Sr87. This method would greatly facilitate laser cooling of Sr.
Abstract The realization of compact high-power narrow-linewidth laser sources in the visible range has been a long-standing interest for the atomic physics community, especially in the field of laser cooling and trapping of alkaline-earth and alkaline-earth-like atoms. We report a simple master-slave injection-locked laser system capable of generating 500 mW at 460.86 nm with a linewidth of 1.6 MHz to realize magneto-optical trapping of strontium atoms on the 5s2 1S0−5s5p 1P15s^{2} \ ^{1}\mathrm {S}_{0}-5s5p \ ^{1}\mathrm {P}_{1}5s2 1S0​−5s5p 1P1​ 5 s 2 1 S 0 - 5 s 5 p 1 P 1 transition. The master laser used is an external cavity diode laser built with an anti-reflection coated laser diode in a Littrow configuration and the slave laser is built with a recently launched single mode high power GaN laser diode. We characterized the frequency noise, injection stability, spectral purity and relative intensity noise of the laser system. The reported laser system is used routinely to produce 10710^7107 10 7 strontium atoms at a temperature of 10 mK in a magneto-optical trap. The laser system offers a prominent alternative to the existing frequency-doubled laser systems in terms of cost, design flexibility, electrical power consumption, ease of scaling, intensity stability, and frequency tunability. The proposed system is also an effective solution for space-based experiments where a laser system’s size, weight, and electrical power consumption are crucial design parameters.
A Cs-133 Magneto-Optical Trap (MOT) has been developed at the Time and Frequency Division of the Centro Nacional de Metrolog´ CENAM, in Mexico. This MOT is part of a primary frequency standard based on ultra-cold Cs atoms, called CsF-1 clock, under development at CENAM. In this Cs MOT, we use the standard configuration (ae + i ae i ) 4-horizontal 2-vertical laser beams 1.9 cm in diameter, with 5 mW each. We use a 852 nm, 5 mW, DBR laser as a master laser which is stabilized by saturation spectroscopy. Emission linewidth of the master laser is 1 MHz. In order to amplify the light of the master laser, a 50 mW, 852 nm AlGaAs laser is used as slave laser. This slave laser is stabilized by light injection technique. A 12 MHz red shift of the light is performed by two double passes through two Acusto-Optic Modulators (AOMs). The optical part of the CENAMs MOT is very robust against mechanical vibration, acoustic noise and temperature changes in our laboratory, because none of our diode lasers use an extended cavity to reduce the linewidth. In this paper, we report results of our MOT characterization as a function of several operation parameters such as the intensity of laser beams, the laser beam diameter, the red shift of light, and the gradient of the magnetic field. We also report accurate absolute measurement of the number of Cs atoms trapped in our Cs MOT. We found up to6 £ 10 7 Cs atoms trapped in our MOT measured with an uncertainty no greater than 6.4%.
We report the experimental realization of a 88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm. The MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 22. The total laser power available in our experiment is about 300 mW. We have trapped 1.6 × 108 88Sr atoms with a 679nm and 707 nm repumping laser. The two repumping lasers enhance the trap population and trap lifetime by factors of 11 and 7, respectively. The 88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal.
We report the experimental realization of88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm and 689nm. The blue MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 44. We have trapped 1.6×10888Sr atoms with the use of 679nm and 707nm repumping laser. The88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal. The 689nm laser used in our experiment has a line width of about 200Hz. To optimize the transfer efficiency, the laser spectrum is broadened by frequency modulation technique to about 2 MHz. The transfer efficiency from blue MOT to red MOT is about 20%.