Laser diode array can operate with high quantum efficiency

output wavelength can range from 570 nm to 1600 nm

and hours of work can be even longer than mega hours.Multi-array stack of Laser Diode Arrays(LDAs) can supply ultrahigh power laser beam and are becoming widespread sources for many kinds of applications involving regions of industries

medicine etc.However

a free-running LDAs always operate on a wide bandwidth with the poor coherence

the laser beam cannot be focused to a small spot with a well-defined intensity profile

and the requirements of high quality laser applications can not be met.So external quarter-Talbot cavity is employed for phase-locking

but corresponding supermode is the out-of-phase supermode

and among all supermodes

only the far-field of the fundamental supermode is central single-lobe

the output is near diffraction-limited

the angle of divergence is the smallest

the concentration of light beam is the greatest

the laser spectrum is the narrowest

thus it is necessary for the external mirror to be tilted by an angle of β=λ/2d

here

λ is the operating wavelength

and d is the period distance

this makes feedback light from array lasing in the fundamental supermode be imaged dominantly in lasing aperture but makes the others be imaged exactly in between lasing apertures

thus only the fundamental supermode be allowed oscillating

but if the output power of a LDAs is ultra high

after it emits a short time

though there is cooling subsystem

so the LDAs can operate continuously

induced by the residual thermal radiation etc

the external mirror will be deformed stochastically to make β drift off λ/2d

with the output power increasing

the margin will up to the cri-tical value

the tilt in degree will mismatch the fundamental supermode

feedback light from array lasing in the fundamental supermode won't be imaged dominantly in lasing aperture

this result in LDAs allowing the other supermode oscillating

the far field distribution will be not single-lobe far field pattern any longer

quality of the output laser beam will be lowered severely

therefore the stability analysis of ultrahigh power LDAs phase-locking with tilted external cavity and corresponding law of change have been specially done at first

then the novel self-adaption two-control technology can be and has been specially developed

with fitting sensor detecting source

matched lens array and so forth in the specially designed structure

the sensing subsystem can effectively detect the deformation of the external mirror in time

and the mating regulating subsystem will compensate the margin concurrently

feedback light from array lasing in the fundamental supermode will be imaged dominantly in lasing aperture stably.The experiment demonstrates that working parameters of a ultra high power LDAs with tilted external cavity is stable by realizing the proposed technology

quality of the output beam from the LDAs is guaranteed high

the performance of the LDAs is improved

so the LDAs can be adequate to satisfy requirements of high quality laser applications

this is significant for ultra high power LDAs applications.