Ohara L-LAH90 Low Tg Optical Glass

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Ohara L-LAH90 Low Tg Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	4.65 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	5.2

Mechanical Properties	Original Value	Comments
Hardness, Knoop	640 @Load 0.0999 kg
Modulus of Elasticity	114.8 GPa
Modulus of Rigidity	44.0 GPa
Poissons Ratio	0.304
Abrasion	73	Aa

Thermal Properties	Original Value	Comments
CTE, linear	6.30 µm/m-°C @Temperature -30.0 - 70.0 °C
	7.40 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.839 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	607 °C	per thermal expansion curve
Softening Point	677 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	597 °C	10¹³ poise; ASTM-C336
Strain Point	578 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.78602 @Wavelength 2325.42 nm
	1.79293 @Wavelength 1970.09 nm
	1.80058 @Wavelength 1529.58 nm
	1.80800 @Wavelength 1128.64 nm
	1.81069 @Wavelength 1013.98 nm	nt (Hg t line)
	1.81568 @Wavelength 852.11 nm	ns (Cs s line)
	1.81926 @Wavelength 768.19 nm	nA' (K A' line)
	1.82262 @Wavelength 706.52 nm	nr (He r line)
	1.82605 @Wavelength 656.27 nm	nC (H C line)
	1.82701 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.82792 @Wavelength 632.8 nm	nHe-Ne
	1.83202 @Wavelength 589.29 nm	nD (Na D line)
	1.83220 @Wavelength 587.56 nm	nd (He D line)
	1.83713 @Wavelength 546.07 nm	ne (Hg e line)
	1.84680 @Wavelength 486.13 nm	nf (H F line)
	1.84803 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.85707 @Wavelength 441.57 nm	nHe-Cd
	1.85866 @Wavelength 435.835 nm	ng (Hg g line)
	1.86881 @Wavelength 404.656 nm	nh (Hg h line)
	1.88683 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	39.84	ν e
	40.1	ν d
Optical Dispersion	0.006153	nd-nC; Partial Dispersion
	0.006789	nC-nA'; Partial Dispersion
	0.010113	ne-nC'; Partial Dispersion
	0.010152	nh-ng; Partial Dispersion
	0.010898	nF'-ne; Partial Dispersion
	0.011081	ne-nC; Partial Dispersion
	0.01186	ng-nF; Partial Dispersion
	0.015354	nC-nt; Partial Dispersion
	0.016322	nC'-nt; Partial Dispersion
	0.020755	nF-nC
	0.021011	nF'-nC'
	0.026462	ng-nd; Partial Dispersion
	0.028165	ni-ng; Partial Dispersion
	0.038801	ni-nF'; Partial Dispersion
Transmission, Visible	84 % @Wavelength 380 nm
	90.3 % @Wavelength 390 nm
	93.6 % @Wavelength 400 nm
	96.6 % @Wavelength 420 nm
	97.8 % @Wavelength 440 nm
	98.5 % @Wavelength 460 nm
	99 % @Wavelength 480 nm
	99.4 % @Wavelength 500 nm
	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 600 nm
	99.8 % @Wavelength 650 nm
	99.9 % @Wavelength 700 nm
IR Transmittance	75 % @Wavelength 2400 nm
	92.5 % @Wavelength 2200 nm
	98.8 % @Wavelength 1800 nm
	99.4 % @Wavelength 1600 nm
	99.6 % @Wavelength 1400 nm
	99.7 % @Wavelength 1000 nm
	99.7 % @Wavelength 1200 nm
	99.8 % @Wavelength 900 nm
	99.9 % @Wavelength 800 nm
UV Transmittance	5.0 % @Wavelength 340 nm
	26 % @Wavelength 350 nm
	55 % @Wavelength 360 nm
	73 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	1.32 G
	1.32 R
coloring, λ 5	340
coloring, λ 80	415
Coloring, Internal Transmission λ 0.05	340
Coloring, Internal Transmission λ 0.80	376
Knoop Hardness Class	6
Melt Frequency	1
Ohara Code d	832401
Ohara Code e	837398
Ohara Status	Preferred
Phosphate Resistance, PR	1.2
Photoelastic Constant (ß)	1.93
Relative Price	9.0	S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	2
Yield Point, At (°C)	644	per thermal expansion curve

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CZOHARA818 / 192093

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