Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Continuous-wave laser spectrometer automatically aligned and continuously tuned from 11.8 to 16.1 µm by use of diode-laser-pumped difference-frequency generation in GaSe

Not Accessible

Your library or personal account may give you access

Abstract

We report a fully automated mid-IR difference-frequency spectrometer with a spectral resolution under 70 MHz pumped by a pair of conventional room-temperature 800–900-nm diode lasers. 0.1 µW of tunable cw radiation is produced from incident-diode powers of 120 and 75 mW. The system has computer-controlled beam alignment with compact CCD cameras, motorized mirrors and positioners to obtain 0.01° crystal-angle positioning, 4-µm beam overlap at the nonlinear crystal, and automated diode laser beam collimation. Computer-operated frequency control uses temperature tuning and current tuning of the free-running diode lasers. The system has been demonstrated by successfully scanning, without any human intervention, 64 randomly selected acetylene absorption lines between 12 and 15 µm. Spectral scans of ammonia are also presented. This mid-IR spectrometer is suitable for fully automated spectroscopy of an unlimited list of mid-IR frequencies and has the potential to detect any trace gas that has an acceptable absorption line within the large tuning range.

© 1999 Optical Society of America

Full Article  |  PDF Article
More Like This
On-line multicomponent trace-gas analysis with a broadly tunable pulsed difference-frequency laser spectrometer

Michael Seiter and Markus W. Sigrist
Appl. Opt. 38(21) 4691-4698 (1999)

Compact gas sensor using a pulsed difference-frequency laser spectrometer

Michael Seiter and Markus W. Sigrist
Opt. Lett. 24(2) 110-112 (1999)

Development of an automated diode-laser-based multicomponent gas sensor

Dirk Richter, David G. Lancaster, and Frank K. Tittel
Appl. Opt. 39(24) 4444-4450 (2000)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved