Fast response broad frequency range laser detector made of hetero-junctions material

Abstract

The invention relates to a fast responding and wide frequency band laser detector, which is made by hetero-junctions material. It comprises a chip made by the optical responding material layer of silicon sheet, first electrode, second electrode and lead wire, wherein the optical responding layer is a lanthanum magnetite layer which is expitaxial grew at silicon bulk; first electrode is positioned on the lanthanum magnetite layer; while second electrode is positioned on the silicon sheet; one end of the two lead wires are separately connected with first electrode and second electrode; while the other end is signal output end. The detector is optical volt type photoelectric cell. It can response the laser pulse of femtosecond pulse width and then produce voltage pulse with the leading edge less than 1ns, half-width less than 2ns and pulse all-width at several ns.

Description

technical field [0001] The invention relates to a laser detector, in particular to a fast-response broadband laser detector made of 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. [0003...

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 giant magnetoresistance properties of doped lanthanum manganate materials, and recently people have also observed the photoelectric properties of doped lanthanum manganate films, but the pulse width is in the order of ms (such as literature 1, Time dependence of laser-induced thermoelectric voltages in la 1-x Ca x MnO 3 and YBa 2 Cu 3 o 7-δ thinfilms, P.X.Zhang et al., Appl.Phys.Lett., Vol.84, No.21, 4026 (2002)), so it cannot be used to detect and measure pulsed laser waveforms with laser pulse widths less than ms

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