Fast response broad band laser detector made by oxide heterojunction material

Abstract

The invention relates to a rapid response wide frequency channel laser detector made of oxide heterogeneous junction material, comprising: a strontium titanic niobate-doped substrate and a lanthanum manganate-doped film layer epitaxially grown on the substrate, thus forming a Nb doped -lanthanum manganate doped oxide heterogeneous junction; or expitaxially growing an insulating layer on the strontium titanic niobate-doped mono-crystalline substrate, and expitaxially growing a lanthanum manganate- doped film on the insulating layer, thus forming a strontium titanic niobate doped-insulating layer-lanthanum manganate doped oxide heterogeneous junction; the first electrode is arranged on the lanthanum manganate-doped film, the second electrode is arranged on the substrate, and the two electrodes are connected with one end of an electrode lead each, and one end of one electrode lead and one end of the other electrode compose a signal output end. As the light irradiates the laser detector, it directly generates a voltage signal without any auxiliary power supply and electronic circuit. Its response waveband ranges from ultraviolet to far infrared, able to respond to fly-second wide laser pulse, and the voltage pulse generated by the laser pulse has front edge less than 1.5ns, half width less than 2ns and full width equal to only several ns.

Description

technical field [0001] The invention relates to a laser detector, in particular to a fast-response broadband laser detector made of oxide heterojunction materials. Background technique [0002] The detection of laser energy, power, pulse width and waveform is not only very important for laser devices and scientific research, but also has a very wide range of applications in military, national defense, production and life. Although people have developed many different types of laser detectors such as pyroelectricity, photoelectricity, pyroelectricity, etc., the work for novel laser detectors is still people's interest and ongoing work, and the applicant is also in this regard Obtained the following patents for laser detectors, such as patent number: ZL89202869.6; patent number: ZL89220541.5; patent number: ZL90202337.3, patent number: ZL90205920.3; Made of electrical materials, the photoresponse of the detector is not fast enough, and the response band is not wide enough. ...

AI Technical Summary

Problems solved by technology

Although people have developed many different types of laser detectors such as pyroelectricity, photoelectricity, pyroelectricity, etc., the work for novel laser detectors is still people's interest and ongoing work, and the applicant is also in this regard Obtained the following patents for laser detectors, such as patent number: ZL89202869.6; patent number: ZL89220541.5; patent number: ZL90202337.3, patent number: ZL90205920.3; The photoresponse of the detector is not fast enough, and the response band is not wide enough.

[0003] People have done a lot of research on the magnetoresistance properties of doped lanthanum manganate materials, and recently people have also observed the photoelectric properties of doped lanthanum manganate films (such as literature 1, Time dependence of laser-inducedthermoelectric voltages in La 1-x Ca x MnO 3 and YBa 2 Cu 3 o 7-δ thin films, P.X.Zhang et al., Appl.Phys.Lett., Vol.84, No.21, 4026(2002)), but the pulse width of its photoresponse is on the order of ms, so it cannot be used to detect and measure laser pulses Pulse laser waveform with width less than ms

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