We report the demonstration of strong coupling between single Cesium atoms and a high-Q chip-based microresonator.
Our toroidal microresonators are compact, Si chip-based whispering gallery mode resonators that confine light to small
volumes with extremely low losses, and are manufactured in large numbers by standard lithographic techniques.
Combined with the capability to couple efficiently light to and from these microresonators by a tapered optical fiber,
toroidal microresonators offer a promising avenue towards scalable quantum networks. Experimentally, laser cooled Cs
atoms are dropped onto a toroidal microresonator while a probe beam is critically coupled to the cavity mode. When an
atom interacts with the cavity, it modifies the resonance spectrum of the cavity, leading to rejection of some of the probe
light from the cavity, and thus to an increase in the output power. By observing such transit events while systematically
detuning the cavity from the atomic resonance, we determine the maximal accessible single-photon Rabi frequency of
Ω0/2π ≈ (100 ± 24) MHz. This value puts our system in the regime of strong coupling, being significantly larger than the dissipation rates in our system.
An efficient microchip laser utilizing domestically fabricated ceramic Yb:YAG is presented. In continuous-wave
(cw) and Q-switched operation, the laser maintains linear polarization with 22 dB extinction and oscillates in the
fundamental TEM00 mode. In cw mode, the ceramic laser has an output power of 2.25 W and a slope efficiency of 66%.
When passively Q-switched at 11.4 kHz repetition rate using Cr:YAG, the 1.9 ns pulse has an average power of 0.72 W
and a slope efficiency of 46%. To our knowledge, this is currently the highest reported power from a ceramic Yb:YAG
laser. The laser performance of the 5-at.% ceramic is compared to a 10-at.% single crystal, and we discuss how the
scattering loss and storage efficiency of the ceramic medium affect its laser characteristics.
We have demonstrated stable operation of a 2-kW Yb:YAG phase-conjugate master oscillator,
power amplifier (PC-MOPA) laser system with a loop phase-conjugate mirror (LPCM). This is
the first demonstration of a CW-input LPCM MOPA operating at a power greater than 1 kW
with a nearly diffraction-limited output beam. The single-pass beam quality incident on the
LPCM varied with the specific operating conditions, but it was typically ~ 20 times diffraction-limited
(XDL). The measured beam quality with a MOPA output power of 1.65 kW was
1.3 XDL.
An efficient microchip laser utilizing domestically fabricated ceramic Yb:YAG is presented. In continuous-wave (cw) and Q-switched operation, the laser maintains linear polarization with 22 dB extinction and oscillates in the fundamental TEM00 mode. In cw mode, the ceramic laser has an output power of 2.25 W and a slope efficiency of 66%. When passively Q-switched at 11.4 kHz repetition rate using Cr:YAG, the 1.9 ns pulse has an average power of 0.72 W and a slope efficiency of 46%. To our knowledge, this is currently the highest reported power from a ceramic Yb:YAG laser. The laser performance of the 5-at.% ceramic is compared to a 10-at.% single crystal, and we discuss how the scattering loss and storage efficiency of the ceramic medium affect its laser characteristics.
In this paper, we report a diode-pumped passively Q-switched Yb:YAG laser that is an excellent candidate for a ladar master oscillator. This microchip laser has 1 ns pulse duration, 68 μJ pulse energy, 700 mW average power, 10 kHz repetition rate, and 29% optical slope efficiency. Additionally, the microchip oscillates in the fundamental TEM00 mode. The peak power was measured as high as 66 kW. We compare the pulse shape and duration, and the beam quality to simulation. We study the effects of Q-switch absorption, output coupler reflectivity, cavity length, and pump power on the laser's pulse duration, pulse energy, average power, and repetition rate.
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