Laser cavity outer power stabilizing device and locking method

A technology for stabilizing devices and external power, which is applied in the field of extracavity power stabilizing devices, which can solve the problems of long-term stability affected by laser polarization changes, achieve short-term stability of high optical power, improve system integration, and simplify the optical path

Active Publication Date: 2011-08-03
杭州昕磁科技有限公司 +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the long-term stability of the external cavity optical power stabilization system is affected by the change of laser polarization, and to improve the short-term stability of the system in a large fluctuation range of optical power, and to provide a system that is independent of the change of laser polarization. The laser extracavity power stabilization technology based on the acousto-optic modulator is used to replace the traditional laser extracavity power stabilization technology

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  • Laser cavity outer power stabilizing device and locking method
  • Laser cavity outer power stabilizing device and locking method
  • Laser cavity outer power stabilizing device and locking method

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Embodiment 1

[0044] See attached figure 1 , mainly consists of a laser system 1, an acousto-optic modulator 2, a half-wave plate 3, a polarizing beam splitter 4, an unpolarized beam splitter 5, a photodiode 6, an optical power stabilization control circuit 7 and an acousto-optic modulator Drive 8 components. Wherein the optical power stabilization control circuit 7, refer to the attached figure 2 , is mainly composed of a weak signal amplification circuit 9, a standard voltage source 10, a differential comparison circuit 11, a PID control circuit 12, a DC voltage regulating circuit 13 and an adding circuit 14.

[0045] Described laser system 1 is a laser system to be stabilized in power; what this implementation example uses is to comprise the DL-Pro tunable semiconductor laser of Toptica company, BoosTA tapered laser amplifier, and some fiber couplers, reflectors and lenses to form Atom laser cooling optical system. The output wavelength is set at 780.1nm, the output power of the part...

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Abstract

The invention discloses a laser cavity outer power stabilizing device and a laser cavity outer power stabilizing method. Reference signals are taken out from a laser system through an unpolarized beam splitter, and an acoustic optical modulator is used as an executor to form a negative feedback loop so as to realize stabilization of optical power. A 1/2 wave plate and a polarizing beam splitter are inserted into a light path to perform polarization and purification, and polarization drift of a laser system can be converted into power fluctuation, so that the splitting ratio of the unpolarized beam splitter is constant and the long-term stability of the optical power is improved; and the acoustic optical modulator is used as an execution element, and the amplitude modulation end of a driver of the acoustic optical modulator can be modulated by using low voltage, so that the noise of a control circuit can be remarkably reduced, the short-term stability of high optical power can be realized, and meanwhile, the stability of the optical power in a large dynamic range can be realized.

Description

technical field [0001] The invention relates to a laser power stabilization technology, in particular to an extracavity power stabilization device and locking method based on an acousto-optic modulator and independent of polarization changes in a laser system. Background technique [0002] Laser technology has a wide range of applications in many fields such as communication, medical treatment, industrial manufacturing and scientific research. Laser power stability is a critical factor in these applications. The optical power can be stabilized by adjusting the resonant cavity of the laser or directly adjusting the driving source through a negative feedback system. However, this method also changes the output wavelength of the laser while adjusting the optical power, so it cannot meet the requirements for high laser power and frequency stability. The above-mentioned shortcomings can be overcome by using the extracavity power stabilization technology. The principle is: use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/11G02B27/28
Inventor 郭彬程冰吴彬王兆英林强
Owner 杭州昕磁科技有限公司
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