Acoustic optical Q-regulating method for two-clad optical-fiber laser and apparatus

A double-clad optical fiber and laser technology, which is applied in the laser field to achieve the effect of reducing insertion loss

Inactive Publication Date: 2005-12-21
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

So far, there has not been a Q-switching method and device that can be directly used for double-clad fiber lasers without collimating and coupling the fiber laser.

Method used

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  • Acoustic optical Q-regulating method for two-clad optical-fiber laser and apparatus
  • Acoustic optical Q-regulating method for two-clad optical-fiber laser and apparatus
  • Acoustic optical Q-regulating method for two-clad optical-fiber laser and apparatus

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Embodiment Construction

[0020] The acousto-optic Q-switching method for double-clad fiber lasers proposed by the present invention has the following principles: figure 2 Shown. The quartz fiber of the double-clad fiber laser (its structure is as figure 1 (Shown) directly used as an acousto-optic medium to form an acoustic standing wave field or a traveling wave field in the double-clad fiber, which will cause the refractive index of the quartz in the fiber to produce corresponding periodic changes, forming a phase grating (6), in the gain The oscillating laser (4) propagating in the core (1) will be diffracted under the action of the phase grating (6), which deflects the transmission direction and breaks away from the waveguide restraint of the gain core (1) and becomes a leaky wave (7) , The leakage wave (7) is equivalent to the waveguide transmission loss, preventing the formation of the oscillating laser (4), the fiber laser is in a low-Q state; the acoustic wave field disappears, the phase grating ...

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Abstract

In the method, quartz optical fiber of doubly coated fiber laser is as acoustooptic medium directly. Stationary field of sound wave or traveling wave field is formed in the medium so as to form phase grating. Deflection of transmitting direction of oscillated laser occurred caused by diffraction under effect of the phase grating is as a leaking wave. The leaking wave prevents forming oscillated laser. Thus, laser of optical fiber is in state of low Q value. When traveling wave field is disappeared, laser is in state of high Q value. The device includes a radio frequency excited ultrasonic transducer, medium for sound propagation, sound reflection interface or body of sound absorption. The medium for sound propagation is placed between the said transducer and the said interface or body of sound absorption. The doubly coated fiber is in medium for sound propagation. Advantages are: acoustooptic Q switch is realized in coated fiber directly so as to lower insertion loss.

Description

Technical field [0001] The invention relates to an acousto-optic Q-switching method and device for a double-clad fiber laser, and belongs to the technical field of lasers. Background technique [0002] The working principle of the ordinary acousto-optic Q switch is: the transducer converts the radio frequency input energy into ultrasound, and the ultrasound propagates in the acousto-optic medium (for 1μm laser, fused silica is a kind of acousto-optic medium) (it can be a traveling wave field or a traveling wave field). It can be reflected on the surface of the opposite medium to form a standing wave field). Due to the acousto-optic effect of the acousto-optic medium, the periodic intensity distribution of the acoustic wave field causes the periodic distribution of the refractive index of the optical medium, thereby forming a single phase for the light transmitted therein. The grating changes the propagation direction of a part of the light. For oscillating laser, it becomes loss....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/33H01S3/067H01S3/117H01S3/17
CPCH01S3/117H01S3/067H01S3/094007H01S3/176
Inventor 巩马理陈刚闫平柳强张海涛李晨黄磊叶昌庚
Owner TSINGHUA UNIV
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