LASER-OPERATED SYSTEM FOR SPECTROSCOPIC ANALYSIS

• US 3,831,030 A
• Filed: 09/07/1973
• Issued: 08/20/1974
• Est. Priority Date: 07/19/1971
• Status: Expired due to Term

• Current Assignee: Joseph Wrobel, Robert Thomas Bate
• Original Assignee: Joseph Wrobel, Robert Thomas Bate
• Inventors: Bate, Robert Thomas, Wrobel, Joseph
• Primary Examiner(s): Dixon, Harow A.
• Application Number:
  US05/395,203
• Time in Patent Office: 347 Days
• Field of Search: 317/235AP,235N 331/94SH 313/108 250/211J,552,338,339
• US Class Current: 250/339.13
• CPC Class Codes: G01N 21/39 using tunable lasers
• CPC Class Codes: H01L 21/00 Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
• CPC Class Codes: H01S 5/0622 Controlling the frequency of the radiation
• CPC Class Codes: H01S 5/32 comprising PN junctions, e.g. hetero- or double- heterostructures H01S5/34, H01S5/36 take precedence

Abstract

A system for spectroscopic analysis is disclosed, the system being laser-operated and including a semiconductor diode laser fabricated from a lead-germanium telluride crystal. An infrared detector is disposed in the optical path of the laser, with a sample holder being positioned between the laser and the infrared detector. The sample being analyzed may comprise a gas and/or vapor having infrared absorption bands matching the wavelength of the laser output to enable the system to perform spectroscopic analysis of the sample.

Claims

1. An analytical system comprising a lead-germanium telluride laser, an infrared detector in the optical path of said laser, and means for holding a sample between said laser and said detector.

2. A system as defined by claim 1, wherein said detector comprises Hg(1 x)CdxTe.

3. A system as defined by claim 2 wherein said laser comprises a semiconductor diode laser having a monocrystalline body of lead-germanium telluride provided with a p-n junction therein, and said body including opposite, parallel, optically flat surfaces perpendicular to a substantial portion of said junction.