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 being affected by laser polarization changes, achieve short-term stability of high optical power, improve long-term stability, and simplify the optical path
Active Publication Date: 2014-08-13
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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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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The invention relates to a laser external power stabilization device and method. A reference signal is taken out in a laser system through a non-polarization beam splitter, and an acousto-optic modulator is used as an executive device to form a negative feedback loop to realize optical power stabilization. Inserting a 1 / 2 wave plate and a polarization beam splitter into the optical path for polarization purification can convert the polarization drift of the laser system into power fluctuations, making the splitting ratio of the non-polarization beam splitter constant, thereby improving the long-term stability of optical power; Using the acousto-optic modulator as the actuator, the amplitude modulation end of the driver can be modulated with a low voltage, which can significantly reduce the noise of the control circuit, thereby achieving high short-term stability of optical power and a large dynamic range of optical power internal stability.
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 ...
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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