Development of a wavelength scanning laser calorimeter

R. Atkinson

doi:10.1364/AO.24.000464

Applied Optics
Vol. 24,
Issue 4,
pp. 464-471
(1985)
•https://doi.org/10.1364/AO.24.000464

Development of a wavelength scanning laser calorimeter

R. Atkinson

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R. Atkinson, "Development of a wavelength scanning laser calorimeter," Appl. Opt. 24, 464-471 (1985)

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Abstract

The design and construction of a wavelength scanning laser calorimeter, for the measurement of absorptance in optical coatings, are described. Preliminary measurements of the absorptance of narrowband spectral filters are presented and are used to illustrate the versatility of the instrument in terms of its large spectral range and sensitivity. Results lead to the conclusion that both materials (cryolite and zinc sulfide) used in the preparation of the coatings contribute significantly to the absorptance of the filters and that interference effects in the substrate must be taken into account, at least at the central wavelengths of the passband region.

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Glass type	Thickness mm	(α + γ/n) ×10⁶ K⁻¹	Δβ/ΔT^c rad K⁻¹	Specific heat J Kg⁻¹ K⁻¹
Borosilicate^a	1.0	7.62	0.115	751.4
	5.0		0.575
BK7^b	1.0	8.3 + 1.1	0.141	857.7
	5.0		0.707
SF58^b	1.0	10.1 + 5.0	0.286	—
	5.0		1.430

Absorptance^a α	Precsion p%	Laser power P_λ(W)	Figure of merit P_λαp (W)	Reference
3 × 10⁻⁴	6	0.17	3.1 × 10⁻⁶	This work
7 × 10⁻⁵	20^b	15.0	2.1 × 10⁻⁴	Hass et al.14
1 × 10⁻⁴	2	6.0	1.2 × 10⁻⁵	Allen et al.15
2 × 10⁻⁵	10	100.0	2.0 × 10⁻⁴	Pinnow and Rich4
3 × 10⁻³	—	5.0	—	Harrington et al.2
1 × 10⁻²	10	3.0	3.0 × 10⁻³	Hutchinson et al.3
1 × 10⁻²	1	15.0	1.5 × 10⁻³	Hoffman8
3 × 10⁻⁴	5	1.13	1.7 × 10⁻⁵	Decker and Temple5

Material	Refractive index
Zinc sulfide	2.354 + i0.00002
Cryolite	1.359 + i0.00009
Substrate	1.520 + i0.0000002

Glass type	Thickness mm	(α + γ/n) ×10⁶ K⁻¹	Δβ/ΔT^c rad K⁻¹	Specific heat J Kg⁻¹ K⁻¹
Borosilicate^a	1.0	7.62	0.115	751.4
	5.0		0.575
BK7^b	1.0	8.3 + 1.1	0.141	857.7
	5.0		0.707
SF58^b	1.0	10.1 + 5.0	0.286	—
	5.0		1.430

Absorptance^a α	Precsion p%	Laser power P_λ(W)	Figure of merit P_λαp (W)	Reference
3 × 10⁻⁴	6	0.17	3.1 × 10⁻⁶	This work
7 × 10⁻⁵	20^b	15.0	2.1 × 10⁻⁴	Hass et al.14
1 × 10⁻⁴	2	6.0	1.2 × 10⁻⁵	Allen et al.15
2 × 10⁻⁵	10	100.0	2.0 × 10⁻⁴	Pinnow and Rich4
3 × 10⁻³	—	5.0	—	Harrington et al.2
1 × 10⁻²	10	3.0	3.0 × 10⁻³	Hutchinson et al.3
1 × 10⁻²	1	15.0	1.5 × 10⁻³	Hoffman8
3 × 10⁻⁴	5	1.13	1.7 × 10⁻⁵	Decker and Temple5

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Equations (13)

Applied Optics