Chen, J-M, Hsu C-Y, Huang W-K, Hsiao S-S, Huang F-C, Chen Y-H, Chuu C-S, Chen Y-C, Chen Y-F, Yu IA.
2022.
Room-temperature biphoton source with a spectral brightness near the ultimate limit. Phys. Rev. Research. 4, 023132(2022)
Chen, J-M, Hsu C-Y, Huang W-K, Hsiao S-S, Huang F-C, Chen Y-H, Chuu C-S, Chen Y-C, Chen Y-F, Yu IA.
2022.
Room-temperature biphoton source with a spectral brightness near the ultimate limit.. Physical Review Research. 4, 023132(2022)
Wang, Y-S, Li K-B, Chang C-F, Lin T-W, Li J-Q, Hsiao S-S, Chen J-M, Lai Y-H, Chen Y-C, Chen Y-F, Chuu C-S, Yu IA.
2022.
Temporally ultralong biphotons with a linewidth of 50 kHz.. APL Photonics. 7(12), 126102(2022)
Cheng, C-Y, Liu Z-Y, Hu P-S, Wang T-N, Chien C-Y, Shiu J-S, Yu IA, Chen Y-C, Chen Y-F.
2021.
Efficient frequency conversion based on electromagnetically induced transparency. Optics Letters. 46, 681(2021)
Hsu, C-Y, Wang Y-S, Chen J-M, Huang F-C, Ke Y-T, Huang EK, Hung W, Chao K-L, Hsaio S-S, Chen Y-H, Chuu C-S, Chen Y-C, Chen Y-F, Yu IA.
2021.
Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mis-match-free scheme. Optics Express. 29, 4632(2021)
Kim, B, Chen K-T, Hsiao S-S, Wang S-Y, Li K-B, Ruseckas J, Juzeliūnas G, Kirova T, Auzinsh M, Chen Y-C, Chen Y-F, Yu IA.
2021.
A weakly-interacting many-body system of Rydberg polaritons based on electromagnetically in-duced transparency. Commun. Phys. 4:101(2021)
Hsiao, Y-F, Tsai P-J, Chen H-S, Lin S-X, Hung C-C, Lee C-H, Chen Y-H, Chen Y-F, Yu IA, Chen Y-C.
2018.
Highly Efficient Coherent Optical Memory Based on Electromagnetically Induced Transparency. Phys. Rev. Lett. 120(183602)
Hsiao, Y-F, Tsai P-J, Lin C-C, Chen Y-F, Yu IA, Chen Y-C.
2014.
Coherence properties of amplified slow light by four-wave mixing. Optics Letters. 39(12):3394-3397.
AbstractWe present an experimental study of the coherence properties of amplified slow light by four-wave mixing (FWM) in a three-level electromagnetically induced transparency (EIT) system driven by one additional pump field. High energy gain (up to 19) is obtained with a weak pump field (a few mW∕cm2) using optically dense cold atomic gases. A large fraction of the amplified light is found to be phase incoherent to the input signal field. The dependence of the incoherent fraction on pump field intensity and detuning and the control field intensity is systematically studied. With the classical input pulses, our results support a recent theoretical study by Lauk et al. [Phys. Rev. A 88, 013823 (2013)], showing that the noise resulting from the atomic dipole fluctuations associated with spontaneous decay is significant in the high gain regime. This effect has to be taken into consideration in EIT-based applications in the presence of FWM.
Chen, Y-H, Lee M-J, Hung W, Chen Y-C, Chen Y-F, Yu IA.
2014.
Interaction between two stopped light pulses. AIP Conference Proceedings . 1588:17-26.
AbstractThe efficiency of a nonlinear optical process is proportional to the interaction time. We report a scheme of all-optical switching based on two motionless light pulses via the effect of electromagnetically induced transparency. One pulse was stopped as the stationary light pulse (SLP) and the other was stopped as stored light. The time of their interaction via the medium can be prolonged and, hence, the optical nonlinearity is greatly enhanced. Using a large optical density (OD) of 190, we achieved a very long interaction time of 6.9 μs. This can be analogous to the scheme of trapping light pulses by an optical cavity with a Q factor of 8×109. With the approach of using moving light pulses in the best situation, a switch can only be activated at 2 photons per atomic absorption cross section. With the approach of employing a SLP and a stored light pulse, a switch at only 0.56 photons was achieved and the efficiency is significantly improved. Moreover, the simulation results are in good agreement with the experimental data and show that the efficiency can be further improved by increasing the OD of the medium. Our work advances the technology in quantum information manipulation utilizing photons.
Lin, PY, Shiau BW, Hsiao YF, Chen YC.
2011.
Creation of arbitrary spectra with an acousto-optic modulator and an injection-locked diode laser, Aug. Review of Scientific Instruments. 82:6., Number 8
AbstractWe use a double-passed acousto-optic modulator (AOM), driven by an arbitrary waveform generator to produce multiple frequency components for a laser with arbitrary frequency spacings. A programmed sequence containing various sections of radio-frequency sinusoidal signal at different frequency is applied to drive the AOM. The diffracted light is used to injection-lock a diode laser. The combined techniques allow us to generate the multi-line spectra for the diode laser with arbitrary frequency spacings in the range of 100 MHz at a relatively high output power of 80 mW and a small power variation of 2%. Such a light source can be used in the application for laser cooling of molecules. (C) 2011 American Institute of Physics. [doi:10.1063/1.3626903]
Tu, MF, Ho JJ, Hsieh CC, Chen YC.
2009.
Intense SrF radical beam for molecular cooling experiments, Nov. Review of Scientific Instruments. 80:5., Number 11
AbstractWe have developed a continuous SrF radical beam for the loading of helium buffer gas cooling. The SrF molecules are efficiently generated by high-temperature chemical reaction of the solid precursor SrF(2) with boron in a graphite oven. The beam properties are characterized with laser-induced fluorescence spectroscopic method. We obtain a molecular flux of up to 2.1 x 10(15) sr(-1) s(-1) at the detection region for all rotational states. The dependence of the flux on oven temperature suggests that even higher flux is possible if a higher temperature in the oven is achieved. (C) 2009 American Institute of Physics. [doi:10.1063/1.3262631]
Chen, YC, Chen YW, Su JJ, Huang JY, Yu IA.
2001.
Pump-probe spectroscopy of cold Rb-87 atoms in various polarization configurations, Apr. Physical Review A. 63:11., Number 4
AbstractWe investigate systematically pump-probe spectroscopy of cold Rb-87 atoms produced by a magneto-optical trap. The pump-probe spectra are measured without the presence of the trapping beams or any optical molasses. Various polarization configurations of the probe and pump fields result in very different spectra of probe absorption. The observed spectra exhibit a dispersive profile, a dispersionlike profile, a Lorentzian profile, or a dispersive profile plus a Lorentzian profile. The widths of all the spectral profiles are narrower than the natural linewidth of the excited state. Our work clarifies the mechanisms behind these different spectral profiles and provides essential information for the pump-probe spectroscopy of cold atoms.
Chen, YC, Lin WB, Hsue HC, Hsu L, Yu IA.
2000.
Effect of the trapping laser linewidth on the atom number in a magneto-optical trap, Oct. Chinese Journal of Physics. 38:920-926., Number 5
AbstractWe have experimentally studied the effect of the trapping laser linewidth on the number of capped atoms in a magneto-optical trap (MOT). Our data show that a significant number of the atoms can still be trapped in the MOT, even when the trapping laser linewidth is larger than the natural linewidth of the excited state of the driving transition.
Tung, SK, Chen YC, Lin CW, Hsu L, Yu IA.
2000.
Cooling atoms below 100 mu K, Apr. Chinese Journal of Physics. 38:395-399., Number 2
AbstractWe capture Rb-87 atoms from room-temperature background vapor with a magneto-optical trap (MOT). The temperature of the atoms in the MOT is 320 mu K as the result of Doppler cooling. We further employ polarization gradient cooling to lower atom temperature. The factors that can affect the performance of polarization gradient cooling have been systematically studied. An atom temperature of 75 mu K has been reached with the optimized conditions. Temperatures are measured by the release and recapture method and the time of flight method. Such cold atoms are ready for the evaporative cooling which will finally realize the Bose-Einstein condensation.
Guan, WY, Xu YH, Sheen SR, Chen YC, Wei JYT, Lai HF, Wu MK, Ho JC.
1994.
ION-SIZE EFFECT ON TN IN (R1-XPRX)BA2CU3O7-Y SYSTEMS (R=LU, YB, TM, ER, Y, HO, DY, GD, EU, SM, AND ND), Jun 1. Physical Review B. 49:15993-15999.
AbstractWe conducted a detailed study of the structure and magnetic properties of (R1-xPrx)Ba2Cu3O7 sintered samples, where R = Lu, Yb, Tm, Er, Y, Ho, Dy, Gd, Eu, Sm, and Nd for x = 0.5-1.0. We found that the temperature dependence of the dc susceptibility follows the Curie-Weiss law in the temperature range 20-300 K and the paramagnetism of the Pr and R sublattices exist independently of one another. The antiferromagnetic ordering temperature T(N) of Pr ions decreases monotonically with increasing R concentration (1-x). At a given x, T(N) is R-ion-size dependent. The slope in the T(N) vs x curve is steeper for ions with smaller ionic radii. The observed results are interpreted in terms of the hybridization between the local states of the Pr ion and the valence-band states of the CuO2 planes.