(a) Schematic of the external cavity laser diode using a blue laser diode. (b) Power and (c) wavelength characteristics of the external cavity laser diode tuned around 460.862 nm at 25 °C.
(a) Setup for injection locking of the slave laser diode. PBS, polarizing beam splitter; λ/2, halfwave plate. (b) Dependence of the slave laser power on the laser current for 20 mW injection power. (c) Dependence of the slave laser power on the injected (master) laser power for 140 mA slave laser current.
(a) Setup for measuring the spatial distribution of Sr atoms in the hollow cathode. (b) Typical Doppler-broadened absorption spectrum of the Sr 1 S 0 → 1 P 1 transition measured in the center of the hollow cathode. The solid line is a fit considering the three major isotopes of 88Sr (82.58%), 87Sr (7.00%), and 86Sr (9.86%).
(a) Spatial variations of the peak optical density of Sr in the hollow cathode for various discharge currents. (b) Dependence of the peak optical density of Sr on the discharge current at distances of 0, 500, 900, and 1400 μm from the center of the cathode.
(a) Setup for polarization spectroscopy of Sr in a hollow cathode lamp. The balanced polarimeter consists of a balanced photodetector (BPD) and a polarizing beamsplitter (PBS). (b) Relevant energy diagram of Sr for the bosonic isotopes (with no hyperfine structure). The effect of the σ+ pump beam on the velocity distribution for each magnetic sublevel is illustrated.
(a) Typical signals obtained by the balanced polarimeter. The signals labeled I A and −I B are obtained when one of the balanced photodetector inputs is blocked. The signal labeled ΔI = I A − I B corresponds to a polarization spectrum expressed by Eq. (2) . (b) Polarization spectra for various pump beam powers.
(a) Saturated-absorption spectrum on the Sr 1 S 0 → 1 P 1 transition and (b) its derivative obtained by wavelength-modulation spectroscopy. The time constant of the lock-in amplifier was 10 ms and the sweep rate of the laser frequency was 500 MHz/s.
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