Mobile CARS instrument for combustion and plasma diagnostics

Torger J. Anderson; Gregory M. Dobbs; Alan C. Eckbreth

doi:10.1364/AO.25.004076

Mobile CARS instrument for combustion and plasma diagnostics

Torger J. Anderson, Gregory M. Dobbs, and Alan C. Eckbreth

Applied Optics
Vol. 25,
Issue 22,
pp. 4076-4085
(1986)
•https://doi.org/10.1364/AO.25.004076

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Torger J. Anderson, Gregory M. Dobbs, and Alan C. Eckbreth, "Mobile CARS instrument for combustion and plasma diagnostics," Appl. Opt. 25, 4076-4085 (1986)

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History
- Original Manuscript: June 7, 1986
- Published: November 15, 1986

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Abstract

A compact and easily transportable coherent anti-Stokes Raman spectroscopy system for combustion and plasma diagnostics is described. The instrument is readily adaptable to a wide variety of test environments and experiments. The system is capable of withstanding high noise and vibration levels and is remotely operable to protect the operator and delicate components from high noise levels or hazardous environments. It is intended for single-pulse temperature and concentration measurements in practical combustion systems, such as gas turbines, diesel engines, and plasma process applications. The system is operational, and initial measurement demonstrations in a supersonic combusting flow are described.

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Item	Description	Specifications	Notes
BS3	Reference cell CARS beam splitter	T_max: ≥532 nm, R_max: <500 nm, p-pol, 45° AOI	a, c
D1	532-nm/1.06-μm Dichroic beam splitter	2-in. diam, 45° AOI, p-pol(532 nm), R_min(532 nm) = 99.5%, T_min(1.06 μm) = 85%	a
D2	BOXCARS pump/Stokes coupling dichroic	2-in. diam, 45° AOI, R_max at 532 nm, T_max at 580–680 nm, BBAR coating on back	a, b
D3	CARS/pump, Stokes splitting dichroic	R(532 nm) ≥ 99.7%, R(570–680 nm) ≥ 80%, T(440–500 nm) ≥ 50%, 45° AOI, 2-in. diam	a
DC	Dye cell windows	2-in. diam, 0.375 in. thick, λ/20 fused silica, wedge < 1″, uncoated
F1	1. 06-μm Absorbing glass	4 in.², 2 mm thick, T_max(532 nm) = 90%, T_min(1.06 μm) = 0.0001
F2	CARS Absorbing glass	2 in.², 3 mm thick, T_max: ≥532 nm, T_min: ≤500 nm	c
F3	CARS Pump filter	2 in.², T_min < 0.00001 at 532 nm, T_max > 50% at 440–550 nm	c
F4	Spectrometer to neutral density filter	N/D = 0 to 4.0, 100 mm diam, circular	d
FO	Spectrometer fiber optic	0.14 N.A., 50–100 diam
G	Spectrometer grating	20.3-cm diam, f/3.8, 2000 lines/mm disp. = 5.26 A/mm	d
L1	Dye laser pump lens	200-mm FL, 50-mm diam	b
L2	Pump telescope eyepiece	−100-mm FL, 30-mm diam, 532 nm AR coated	a, b
L3	Pump telescope objective	200-mm FL, 30-mm diam typ, 532 nm AR coated	a, b
L4	Stokes telescope objective	−50-mm FL, 30-mm diam, BBAR coated	a, b
L5	Stokes telescope eyepiece	150-mm FL, 30-mm diam typ, BBAR coated	a, b
L6	Field lenses	300-mm FL, 66-mm diam typ, BBAR coating	a, b
L7	CARS focusing lens	65-mm FL, 25-mm diam, achromat
L8	Reference cell lenses	150-mm FL, 52-mm diam, 532 nm AR coated	a, c
M1	1.06-μm turning mirror	2-in. diam, 45° AOI, p-pol, R_min = 99.5%	a
M2	532-nm Turning mirror	2-in. diam, 45° AOI, p-pol, R_min = 99.5%	a
M3	532-nm Periscope mirror	2-in. diam, 45° AOI, s-pol, R_min = 99%	a
M4	Broadband dye laser mirror	1-in. diam, R_min = 99% from 580 to 680 nm, 0° AOI	a
M5	Broadband dye laser output mirror	1-in. diam, R = 50% from 580 to 680 nm, 0° AOI	a
M6	CARS signal turning mirror	2-in. diam, aluminized, front surface
M7	Spectrometer turning mirror	Elliptical, 18.0 × 12.7 mm enhanced aluminum	d
P1	Dye laser osc/amp coupling prism	2-in.² faces, BBAR coating on hypotenuse	a
P2	Dye laser output coupling prism	1-in.² faces, BBAR coating on both faces	a
P3	Field prisms	2-in.² faces, BBAR coating both sides
PB	Pelam-Brocca prism	20-mm square aperture

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