External cavity feedback laser generation method and laser

Abstract

The invention discloses an external cavity feedback laser generation method and a laser and belongs to the technical field of laser. The method comprises: 1) collimating the light beam output by a laser diode coated with an anti-reflection film by using a collimating lens; 2) performing frequency selection operation of the collimated light beam by using an atom filter; and 3) feeding the laser subjected to frequency selection back to the laser diode coated with the anti-reflection film by using an external cavity mirror. In the laser, the light beam output by the laser semiconductor diode coated with the anti-reflection film passes through the collimating lens, the atom filter and the external cavity mirror in turn and then return to the later semiconductor diode coated with the anti-reflection film, so that the later semiconductor diode coated with the anti-reflection film, the collimating lens, the atom filter and the external cavity mirror form a resonance light path; and a control circuit is connected with the later semiconductor diode coated with the anti-reflection film and the atom filter respectively. The method and the laser improve the long-term stability and accuracy of the laser and have high immune capacity for external environmental factors, the working temperature of the diode and the wavenoise of a working current.

Description

technical field [0001] The invention relates to external cavity feedback laser technology, in particular to an external cavity feedback laser generation method immune to gain medium temperature and current noise and a laser, belonging to the field of laser technology. Background technique [0002] Due to its narrow linewidth, tunable, easy frequency stabilization, small size, and compact structure, external cavity semiconductor lasers are widely used in cold atomic physics, laser spectroscopy, quantum information, metrology, environmental monitoring, and industrial measurement. . At present, semiconductor lasers of various bands in the world basically use the method of epitaxial resonator feedback (referred to as external cavity) to narrow the line width of the laser. At the same time, in order to achieve single-mode operation, there must be a mode selection element. One solution in the prior art of this kind of external cavity feedback semiconductor laser is to use a grati...

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Problems solved by technology

More strictly speaking, the external cavity feedback semiconductor laser realized by the existing grating external cavity and interference filter external cavity technology has no accuracy due to long-term frequency drift

[0003] In addition, the prior art has also reported the use of atomic filters to construct external cavity feedback lasers for semiconductor lasers without anti-reflection coatings, but the laser output frequency of such a structure is still very sensitive to parameters such as semiconductor temperature and current, and it is easy to mode hopping

Therefore, there is no anti-reflection coating on the external cavity feedback laser, even if the atomic filter is used, it cannot be used in specific applications.

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