
Proceedings Paper
Compact, narrow-linewidth, tunable ultraviolet laser source for detecting Hg emissionsFormat | Member Price | Non-Member Price |
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Paper Abstract
Recent EPA regulations targeting mercury (Hg) emissions from utility coal boilers have prompted increased activity in
the development of reliable chemical sensors for monitoring Hg emissions with high sensitivity, high specificity, and
fast time response. We are developing a portable, laser-based instrument for real-time, stand-off detection of Hg
emissions that involves exciting the Hg (6 3P1 ←6 1S0) transition at 253.7 nm and detecting the resulting resonant
emission from Hg (6 3P1). The laser for this approach must be tunable over the Hg absorption line at 253.7 nm, while
system performance modeling has indicated a desired output pulse energy ≥0.1 μJ and linewidth ≤5 GHz (full width at
half-maximum, FWHM). In addition, the laser must have the requisite physical characteristics for use in coal-fired
power plants. To meet these criteria, we are pursing a multistage frequency-conversion scheme involving an optical
parametric amplifier (OPA). The OPA is pumped by the frequency-doubled output of a passively Q-switched,
monolithic Nd:YAG micro-laser operating at 10-Hz repetition rate and is seeded by a 761-nm, cw distributed-feedback
diode laser. The resultant pulse-amplified seed beam is frequency tripled in two nonlinear frequency-conversion steps to
generate 253.7-nm light. The laser system is mounted on a 45.7 cm × 30.5 cm breadboard and can be further condensed
using custom optical mounts. Based on simulations of the nonlinear frequency-conversion processes and current results,
we expect this laser architecture to exceed the desired pulse energy. Moreover, this approach provides a compact, all-solid-
state source of tunable, narrow-linewidth visible and ultraviolet radiation, which is required for many chemical
sensing applications.
Paper Details
Date Published: 13 February 2008
PDF: 10 pages
Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750K (13 February 2008); doi: 10.1117/12.761907
Published in SPIE Proceedings Vol. 6875:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
Peter E. Powers, Editor(s)
PDF: 10 pages
Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750K (13 February 2008); doi: 10.1117/12.761907
Show Author Affiliations
Alexandra A. Hoops, Sandia National Labs. (United States)
Roger L. Farrow, Sandia National Labs. (United States)
Paul Schulz, Sandia National Labs. (United States)
Thomas A. Reichardt, Sandia National Labs. (United States)
Roger L. Farrow, Sandia National Labs. (United States)
Paul Schulz, Sandia National Labs. (United States)
Thomas A. Reichardt, Sandia National Labs. (United States)
Ray P. Bambha, Sandia National Labs. (United States)
Randal L. Schmitt, Sandia National Labs. (United States)
Dahv A. V. Kliner, Sandia National Labs. (United States)
Randal L. Schmitt, Sandia National Labs. (United States)
Dahv A. V. Kliner, Sandia National Labs. (United States)
Published in SPIE Proceedings Vol. 6875:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
Peter E. Powers, Editor(s)
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