Browsing by Author "Shie, Nang-Chian"

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Absolute frequency measurements of the molecular iodine hyperfine transitions at 535 nm
(2013-07-01)
Shie, Nang-Chian
;
Chen, Shih-En
;
Chang, Chun-Yu
;
Hsieh, Wen-Feng
;
Shy, Jow-Tsong
We report absolute frequency measurements of the alpha(1), alpha(10), and alpha(15) hyperfine components of molecular iodine P(28) 30-0 line at 535 nm. A frequency-doubled 1070 nm Nd:GdVO4 laser is frequency stabilized to a hyperfine component of I-2 using the third-harmonic demodulation technique. The frequency stability of 3 x 10(-12) is achieved at 10 s averaging time when its frequency is stabilized to the alpha(1) component. An optical frequency comb is used to measure its absolute frequency. The pressure shift is investigated to obtain the absolute frequency at zero pressure. The effect of pressure and power broadening of the a10 component are also investigated. This light source can be used for investigating parity nonconservation effect in atomic thallium. (C) 2013 Optical Society of America
Frequency measurement of the 6P(3/2) -> 7S(1/2) transition of thallium
(2013-12-30)
Shie, Nang-Chian
;
Chang, Chun-Yu
;
Hsieh, Wen-Feng
;
Liu, Yi-Wei
;
Shy, Jow-Tsong
The saturated absorption spectrum of the 6P(3/2) -> 7S(1/2) transition of Tl-203 and Tl-205 in a hollow cathode lamp has been observed with a frequency-doubled 1070 nm Nd : GdVO4 laser. The third-derivative spectrum of the hyperfine components are obtained using the wavelength modulation spectroscopy and used to stabilize the laser frequency. The analysis of the error signal shows that the frequency stability reaches 30 kHz at 1 s averaging time. Such a frequency-stabilized light source at 535 nm can be used for laser cooling of thallium and for investigating the parity non-conservation effect in thallium. The absolute frequencies of hyperfine components are measured with an accuracy of 30 MHz using a precision wavelengthmeter. Including the pressure shift correction, the center of gravity of the transition frequency is determined to an accuracy of 22 MHz for both isotopes. Meanwhile, the isotope shift derived is in good agreement with earlier measurement.
Single frequency 1070 nm Nd:GdVO(4) laser using a volume Bragg grating
(2011-10-24)
Shie, Nang-Chian
;
Hsieh, Wen-Feng
;
Shy, Jow-Tsong
;
光電工程學系
;
Department of Photonics
We demonstrate a single frequency diode-pumped Nd:GdVO(4) laser at 1070 nm using a volume Bragg grating as the output coupler of a short plano-concave cavity. The TEM(00) output had a maximum power of 300 mW and a linewidth less than 23 MHz. The beam propagation parameter M(2) and the divergence angle at 200 mW were 1.2 and 0.37 degrees, respectively. The single frequency tuning range was 5.1 GHz at 100 mW. Upon locking the laser frequency to a confocal reference cavity, a relative stability of 7.58 kHz was achieved. If frequency doubled, such as using a periodically-poled lithium niobate (PPLN) crystal, this laser offers an excellent light source for parity non-conservation experiments of atomic thallium.
Single frequency 1070 nm Nd:GdVO4 laser using a volume Bragg grating
(2011-10-24)
Shie, Nang-Chian
;
Hsieh, Wen-Feng
;
Shy, Jow-Tsong
;
光電工程學系
;
光電工程研究所
We demonstrate a single frequency diode-pumped Nd:GdVO4 laser at 1070 nm using a volume Bragg grating as the output coupler of a short plano-concave cavity. The TEM00 output had a maximum power of 300 mW and a linewidth less than 23 MHz. The beam propagation parameter M-2 and the divergence angle at 200 mW were 1.2 and 0.37 degrees, respectively. The single frequency tuning range was 5.1 GHz at 100 mW. Upon locking the laser frequency to a confocal reference cavity, a relative stability of 7.58 kHz was achieved. If frequency doubled, such as using a periodically-poled lithium niobate (PPLN) crystal, this laser offers an excellent light source for parity non-conservation experiments of atomic thallium.