Frequency stabilization of a semiconductor laser using the faraday effect of the saturated absorption spectroscopy signal of rb atoms
| Autor: | Takashi Sato, Takao Nakazawa, Minoru Shimba, Takashi Ueno, Hiroyuki Nakano |
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| Rok vydání: | 1993 |
| Předmět: |
Tunable diode laser absorption spectroscopy
Materials science Absorption spectroscopy Computer Networks and Communications Oscillation business.industry Saturated absorption spectroscopy General Physics and Astronomy Laser law.invention symbols.namesake Optics Modulation law Faraday effect symbols Electrical and Electronic Engineering Atomic physics business Doppler effect |
| Zdroj: | Electronics and Communications in Japan (Part II: Electronics). 76:12-21 |
| ISSN: | 1520-6432 8756-663X |
| DOI: | 10.1002/ecjb.4420760702 |
| Popis: | To stabilize the oscillation frequency of a semiconductor laser by using an absorption spectrum of atoms and molecules as a frequency reference, modulation of an injection current of the laser has commonly been adopted since it gives a high detection sensitivity. However, as a result, the oscillation frequency becomes broadened, which is a drawback. To overcome this difficulty, a new method has been proposed which utilizes the modulation scheme resulting from the Faraday effect of Rb atoms and thus no direct modulation is needed. In a conventional method using a normal absorption spectrum, detection sensitivity is limited by a spectrum broadening due to the Doppler effect. The stability has been improved one order of magnitude by using a saturated absorption spectroscopy method, compared to the conventional method. Also, with this method, a number of stabilized frequency points is increased. An oscillation frequency can be controlled by changing the dc magnetic field for the Faraday effect modulation for a frequency range over about 8 GHz around the frequency corresponding to Rb-D2 lines. |
| Databáze: | OpenAIRE |
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