TITLE:
PAD Spectrometer Based on Wide Tunable Optical Parametric Oscillator for Noninvasive Medical Diagnostics
AUTHORS:
D. B. Kolker, I. V. Sherstov, A. I. Karapuzikov, A. A. Karapuzikov, A. A. Boyko, M. K.Starikova, N. Yu. Dukhovnikova, V. N. Loconov, M. Yu. Shtyrov, I. B. Miroshnichenko, K. G. Zenov, M. B. Miroshnichenko
KEYWORDS:
Optical Parametric Oscillator; Nonlinear Optical Crystals; Silver Thiogallate; Fun – out PPLN; Photo - Acoustic Spectroscopy; Absorption Spectrum
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.2B,
July
18,
2013
ABSTRACT: The gas analyzer based on optical parametric oscillators
(OPO) and laser photo - acoustic spectroscopy is demonstrated. The optical
parametric oscillators based on fun – out PPLN and bulk crystal AgGaS2 with a two-pass pumping are developed. Wide tunable OPO is pumped by compact
nanosecond Nd: YLF laser. Pulse duration is 5 - 7 ns,
maximum pulse energy is 1.5 mJ at a frequency of 100-2000 Hz. OPO lasing
threshold is 10 - 16 mJ/cm2 at the spectral range 2.2 - 4 μm
for fun – out PPLN OPO and 12 - 20 mJ/cm2 at the spectral range 4 - 7.5 μm for
AgGaS2 OPO. Absorption
spectra of gaseous mixtures (CH4, C3H8,
C2H6, C2H4 and CO2) and
human’s breath were studied.