Fabrication of molded chalcogenide-glass lens for thermal imaging applications

Du Hwan Cha; Hye-Jeong Kim; Yeon Hwang; Jae Cheol Jeong; Jeong-Ho Kim

doi:10.1364/AO.51.005649

Fabrication of molded chalcogenide-glass lens for thermal imaging applications

Du Hwan Cha, Hye-Jeong Kim, Yeon Hwang, Jae Cheol Jeong, and Jeong-Ho Kim

Applied Optics
Vol. 51,
Issue 23,
pp. 5649-5656
(2012)
•https://doi.org/10.1364/AO.51.005649

Get Citation
Copy Citation Text
Du Hwan Cha, Hye-Jeong Kim, Yeon Hwang, Jae Cheol Jeong, and Jeong-Ho Kim, "Fabrication of molded chalcogenide-glass lens for thermal imaging applications," Appl. Opt. 51, 5649-5656 (2012)

Export Citation
- BibTex
- Endnote (RIS)
- HTML
- Plain Text
Get PDF (1236 KB)
Set citation alerts
Save article

Related Topics
Table of Contents Category
- Optical Design and Fabrication
Optics & Photonics Topics
?

The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Thermal imaging (110.6820)
- Optical fabrication (120.4610)
- Lenses (220.3630)

About this Article
History
- Original Manuscript: May 8, 2012
- Revised Manuscript: June 27, 2012
- Manuscript Accepted: June 28, 2012
- Published: August 2, 2012

Not Accessible

Your account may give you access

Abstract

With the recent development of less costly uncooled detector technology, expensive optics are among the remaining significant cost drivers. As a potential solution to this problem, the fabrication of IR lenses using chalcogenide glass has been studied in recent years. We report on the fabrication of a molded chalcogenide-glass lens for car night vision and on the evaluation of the lens. The moldability of chalcogenide glass was characterized through transcription properties of the mold’s surface. In addition, both IR transmittance and x-ray diffraction patterns of the molded chalcogenide-glass lens were evaluated to verify the compositional and structural stability of the glass material under the given molding conditions.

Full Article | PDF Article

OSA Recommended Articles

Effect of temperature on the molding of chalcogenide glass lenses for infrared imaging applications

Du Hwan Cha, Hye-Jeong Kim, Heung Su Park, Yeon Hwang, Jeong-Ho Kim, Jun-Hee Hong, and Kee-Seok Lee
Appl. Opt. 49(9) 1607-1613 (2010)

Investigation of index change in compression molding of As₄₀Se₅₀S₁₀ chalcogenide glass

Lin Zhang, Wenchen Zhou, Neil. J. Naples, and Allen Y. Yi
Appl. Opt. 57(15) 4245-4252 (2018)

Development of a compression molding process for three-dimensional tailored free-form glass optics

Allen Y. Yi, Chunning Huang, Fritz Klocke, Christian Brecher, Guido Pongs, Markus Winterschladen, Axel Demmer, Sven Lange, Thomas Bergs, Michael Merz, and Frank Niehaus
Appl. Opt. 45(25) 6511-6518 (2006)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (14)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (7)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Thermal properties	Thermal conductivity ( $W / m \cdot K$ )		0.23
	Thermal expansion coefficient ( $10^{- 6} / K$ )		14.1
	Transition temperature ( $T_{g}$ ) (°C)		285
	Softening point ( $T_{s}$ ) (°C)		309
Optical properties	Refractive index at 10 μm	25 °C	2.58609
		80 °C	2.58928
	Thermo-optic coefficient at 10 μm ( $10^{- 6} / K$ )		58
Mechanical properties	Young’s modulus (GPa)		19.11

Term	Form error (PV)	Roughness (Ra)	Tilt	Decenter	Transmittance (Wavelength 8–12 μm)
Fabrication tolerance	$< 1.0 μm$	$< 20 nm$	$< 3 arcmin$	$< 20 μm$	$> 90 %$

Grinding process
Wheel configuration	SD 2000, Resin bond
Workpiece speed	350 rpm
Grinding wheel speed	37,000 rpm
Feed rate	$1.0 mm / \min$
Depth of cut	0.25 μm
Polishing process
Diamond paste (grain size)	Rough: 1.0 μm, Finish: 0.25 μm
Polishing medium	Nylon

		L1		L2
		Surface A	Surface B	Surface A	Surface B
Form error (PV; μm)	Before	0.71	0.45	0.56	0.55
Form error (PV; μm)	After	0.65	0.53	0.70	0.43
Surface roughness (Ra; nm)	Before	13.0	8.3	10.7	12.5
Surface roughness (Ra; nm)	After	17.5	11.0	14.2	9.8

		Heating stage
		First	Second	Pressing stage	Slow cooling stage
Temperature (°C)	Upper plate	—	—	320	200
Temperature (°C)	Lower plate	250	320	320	200
Pressing force (N)		—	—	500	200
Unit-process time (s)		800

Aspheric coef.		C	K	A4	A6	A8	A10
Surface A	Before	$4.94 e^{- 2}$	$- 1.58$	$- 1.98 e^{- 5}$	$- 3.62 e^{- 7}$	$- 1.31 e^{- 10}$	$- 2.41 e^{- 11}$
Surface A	After	$4.89 e^{- 2}$	$- 1.58$	$- 1.48 e^{- 5}$	$- 7.54 e^{- 7}$	$1.35 e^{- 8}$	$- 2.46 e^{- 10}$
Surface B	Before	$4.35 e^{- 2}$	$- 4.43$	$- 5.87 e^{- 5}$	$- 1.00 e^{- 6}$	$5.04 e^{- 10}$	$2.42 e^{- 11}$
Surface B	After	$4.28 e^{- 2}$	$- 4.43$	$- 5.96 e^{- 5}$	$- 9.02 e^{- 7}$	$- 3.08 e^{- 9}$	$1.16 e^{- 10}$

Abstract

References

Cited By

Figures (14)

Tables (7)

Equations (1)

Metrics

Login or Create Account