Abstract
We produced a pair of coherent laser beams with a 3-GHz frequency difference by optically phase locking two modes from a single, multimode extended-cavity diode laser. This method is complementary to either a direct modulation or an optical phase locking of two independent lasers. A large differential frequency shift between the two modes of the laser allows efficient phase locking. We developed a simple theory to account for the large differential frequency shift. Allan deviation of the beat frequency when the two modes are phase-locked drops as an inverse of the measurement time and it reaches 10-14 when the time is 1 h. Coherent population trapping spectroscopy of Rb atoms using the phase-locked beams resulted in a spectrum as narrow as that of the case using direct modulation by a stable frequency synthesizer.
| Original language | English |
|---|---|
| Article number | 023107 |
| Journal | Review of Scientific Instruments |
| Volume | 81 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2010 Mar 16 |
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ASJC Scopus subject areas
- Instrumentation
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Production of a coherent pair of light beams with a microwave frequency difference from a single extended-cavity diode laser. / Yim, Sin Hyuk; Cho, Donghyun.
In: Review of Scientific Instruments, Vol. 81, No. 2, 023107, 16.03.2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Production of a coherent pair of light beams with a microwave frequency difference from a single extended-cavity diode laser
AU - Yim, Sin Hyuk
AU - Cho, Donghyun
PY - 2010/3/16
Y1 - 2010/3/16
N2 - We produced a pair of coherent laser beams with a 3-GHz frequency difference by optically phase locking two modes from a single, multimode extended-cavity diode laser. This method is complementary to either a direct modulation or an optical phase locking of two independent lasers. A large differential frequency shift between the two modes of the laser allows efficient phase locking. We developed a simple theory to account for the large differential frequency shift. Allan deviation of the beat frequency when the two modes are phase-locked drops as an inverse of the measurement time and it reaches 10-14 when the time is 1 h. Coherent population trapping spectroscopy of Rb atoms using the phase-locked beams resulted in a spectrum as narrow as that of the case using direct modulation by a stable frequency synthesizer.
AB - We produced a pair of coherent laser beams with a 3-GHz frequency difference by optically phase locking two modes from a single, multimode extended-cavity diode laser. This method is complementary to either a direct modulation or an optical phase locking of two independent lasers. A large differential frequency shift between the two modes of the laser allows efficient phase locking. We developed a simple theory to account for the large differential frequency shift. Allan deviation of the beat frequency when the two modes are phase-locked drops as an inverse of the measurement time and it reaches 10-14 when the time is 1 h. Coherent population trapping spectroscopy of Rb atoms using the phase-locked beams resulted in a spectrum as narrow as that of the case using direct modulation by a stable frequency synthesizer.
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U2 - 10.1063/1.3309782
DO - 10.1063/1.3309782
M3 - Article
VL - 81
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
SN - 0034-6748
IS - 2
M1 - 023107
ER -