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Laser diode sensor

  • US 5,591,407 A
  • Filed: 04/21/1995
  • Issued: 01/07/1997
  • Est. Priority Date: 04/21/1995
  • Status: Expired due to Fees
First Claim
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1. A surface-active laser chemical sensor for detecting chemical changes in an ambient environment comprising a substrate, a diode laser structure deposited on the substrate for generating a laser signal, the laser structure further comprising an active layer, a barrier layer on the active layer, a cladding layer on the barrier layer, and a reducing layer on the cladding layer, a contact layer formed on the reducing layer having a deposited electrode, a surface sensitive region adjacent to the electrode, wherein in the surface sensitive region the thickness of the cladding layer is from 0.5 microns to less than 0.05 microns to enable a tail of a lasing mode to have a finite value at the surface of the laser, such that the laser structure and the signal generated by the laser structure exhibit sensitivity to an analyte at the surface sensitive region, wherein the laser structure produces in the presence of the analyte a laser signal, and wherein the laser signal is detected by a detector.

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