Abstract
An iodine-stabilized diode laser-pumped Nd:YAG laser system at 532 nm was developed at the National Institute of Metrology of Thailand (NIMT) for the first time in Thailand. Two iodine cells with the lengths of 10 and 50 cm were used for the comparison of frequency stability of Nd:YAG laser. The experiment was set for phase modulation spectroscopy. The Nd:YAG laser was locked to the a10 component of the R(56)32-0 transition of iodine molecule. The variation of wavelength with time and the frequency stability were carried out at various iodine cell temperatures of 20, 10, 5, 1, -1, -3 and -5°C. The results from the frequency stability measurements showed that the lowest Allan standard deviation value of 6.643×10-10 was obtained at -5°C for 50 cm long iodine cell. From this Allan standard deviation value, it can be concluded that the iodine-stabilized diode laser-pumped Nd:YAG laser system at 532 nm developed in this study is acceptable to be used with a gauge block interferometer for the length calibration of the gauge block.
Highlights
IntroductionMolecular iodine is presently used as the source of the frequency reference with reference frequencies at 532, 543, 612, 633 nm and others (Felder, 2005)
Frequency-stabilized lasers have been widely used in many applications such as laser cooling and trapping of atoms, precision measurement, highresolution spectroscopy and optical communications (Döringshoff et al, 2012; Tiwari et al, 2005; Nyholm et al, 2003).Molecular iodine is presently used as the source of the frequency reference with reference frequencies at 532, 543, 612, 633 nm and others (Felder, 2005)
The iodine-stabilized diode laserpumped Nd:YAG laser system at 532 nm was developed at the National Institute of Metrology of Thailand (NIMT) for the first time in Thailand
Summary
Molecular iodine is presently used as the source of the frequency reference with reference frequencies at 532, 543, 612, 633 nm and others (Felder, 2005). These lines can be used as excellent frequency references for laser stabilization to a few parts in 10−9 or better (Edwards et al, 1996). A set of selected transitions for iodine molecule at 532 nm that are included in the recommendation of the wavelength standards by the International Committee for Weights and Measures (CIPM) was reported by Quinn (2003). Most works on the iodine-stabilized laser, the frequency and wavelength of the laser will be locked to the a10 component of the R(56) 32-0 transition
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