Optical beam deflection sensor: design and experiments

João M. S. Sakamoto; Renan B. Marques; Cláudio Kitano; Nicolau A. S. Rodrigues; Rudimar Riva

doi:10.1364/AO.56.008005

Applied Optics
Vol. 56,
Issue 28,
pp. 8005-8013
(2017)
•https://doi.org/10.1364/AO.56.008005

Optical beam deflection sensor: design and experiments

João M. S. Sakamoto, Renan B. Marques, Cláudio Kitano, Nicolau A. S. Rodrigues, and Rudimar Riva

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João M. S. Sakamoto, Renan B. Marques, Cláudio Kitano, Nicolau A. S. Rodrigues, and Rudimar Riva, "Optical beam deflection sensor: design and experiments," Appl. Opt. 56, 8005-8013 (2017)

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Abstract

In this work, we present a double-pass optical beam deflection sensor and its optical design method. To accomplish that, a mathematical model was proposed and computational simulations were performed, in order to obtain the sensor’s characteristic curves and to analyze its behavior as function of design parameters. The mathematical model was validated by comparison with the characteristic curves acquired experimentally. The sensor was employed to detect acoustic pulses generated by a pulsed laser in a sample surface, in order to show its potential for monitoring applications handling high energy input as laser welding or laser ablation.

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Characteristic Curve	Slope ^b	Normalized Sensitivity ^a [mV/μrad]	Linear Range [μrad]	Non- Linearity [%]
Curve 1	Pos.	$(2.4 \times V_{\max})$	352	6.0
w/o KE	Neg.	$(- 2.4 \times V_{\max})$	352	6.0
Curve 3	Pos.	$(2.84 \times V_{\max})$	296	7.6
w/KE	Neg.	$(- 2.86 \times V_{\max})$	296	7.7

Characteristic Curve (in Focus)	Normalized Sensitivity ^a [mV/μrad]	Linear Range [μrad]	Non- Linearity [%]
$f = 30 mm$	$(2.2 \times V_{\max})$	384	4.4
$f = 50 mm$	$(2.2 \times V_{\max})$	400	4.3

	$f = 30 mm$	$f = 50 mm$
$M^{2}$	1.1	1.1
$w_{o}$	19 μm	30 μm
$z_{o}$	30 mm	48 mm

Characteristic Curve	Slope ^b	Normalized Sensitivity ^a [mV/μrad]	Linear Range [μrad]	Non- Linearity [%]
Curve 1	Pos.	$(2.4 \times V_{\max})$	352	6.0
w/o KE	Neg.	$(- 2.4 \times V_{\max})$	352	6.0
Curve 3	Pos.	$(2.84 \times V_{\max})$	296	7.6
w/KE	Neg.	$(- 2.86 \times V_{\max})$	296	7.7

Characteristic Curve (in Focus)	Normalized Sensitivity ^a [mV/μrad]	Linear Range [μrad]	Non- Linearity [%]
$f = 30 mm$	$(2.2 \times V_{\max})$	384	4.4
$f = 50 mm$	$(2.2 \times V_{\max})$	400	4.3

João M. S. Sakamoto	https://orcid.org/0000-0001-5246-5115
Cláudio Kitano	https://orcid.org/0000-0001-6320-755X
Nicolau A. S. Rodrigues	https://orcid.org/0000-0002-3173-2381
Rudimar Riva	https://orcid.org/0000-0002-4533-8721

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Applied Optics