GlassCat

Abstract type encapsulating all glasses.

Stores all attributes relating to a glass type specified in an .AGF glass catalog.

Never used directly, instead created using catalog glasses, e.g. GlassCat.SCHOTT.N_BK7.

In order to prevent type ambiguities in OpticSim.jl we can't have this type paramaterized.

Special glass to represent air. Refractive index is defined to always be 1.0 for any temperature and pressure (other indices are relative to this).

Object identifying a glass, containing a type (e.g. MODEL, MIL, OTHER or AGF) depending on how the glass is defined, and an integer ID. Air is AIR:0, others are on the form AGF:N, for example.

index(glass::AbstractGlass, wavelength; temperature=20°C, pressure=1Atm)

Compute the refractive index of glass at wavelength, optionally at specified temperature and pressure. Result is relative to the refractive index of air at given temperature and pressure.

If unitless, arguments are interpretted as μm, °C and Atm respectively.

This is defined to always equal 1.0 for Air at any temperature and pressure, use absairindex for the absolute refractive index of air at a given temperature and pressure.

Examples

julia> index(GlassCat.Sumita.LAK7, 700u"nm")
1.646494204478318

julia> index(GlassCat.SCHOTT.N_BK7, 0.55, temperature = 22.0)
1.51852824383283

julia> index(GlassCat.HOYA.FF1, 532u"nm", temperature = 25u"°C", pressure = 1.3)
1.5144848290944655

absairindex(wavelength; temperature=20°C, pressure=1Atm)

Compute the absolute refractive index of air at wavelength, optionally at specified temperature and pressure. If unitless, arguments are interpretted as μm, °C and Atm respectively.

Examples

julia> absairindex(700u"nm")
1.000271074905147

julia> absairindex(0.7, temperature=27.0)
1.000264738846504

julia> absairindex(532u"nm", temperature = 25u"°C", pressure = 1.3)
1.0003494991178161

absorption(glass::AbstractGlass, wavelength; temperature=20°C, pressure=1Atm)

Compute the intensity absorption per mm of glass at wavelength, optionally at specified temperature and pressure. Transmission values are linearly interpolated from the adjacent values in the data table of glass, if wavelength is below the minimum or above the maximum in the table then the nearest value is taken.

Absorption is defined as $\frac{-\log(t)}{\tau}$ where $t$ is the transmission value and $\tau$ is the thickness, both of which are provided in the data table.

If unitless, arguments are interpretted as μm, °C and Atm respectively.

Examples

julia> absorption(GlassCat.Sumita.LAK7, 700u"nm")
0.0006018072325563021

julia> absorption(GlassCat.SCHOTT.N_BK7, 0.55, temperature = 22.0)
0.00016504471175660636

julia> absorption(GlassCat.SCHOTT.PSK3, 532u"nm", temperature = 25u"°C", pressure = 1.3)
0.00020855284788532435

glassfromMIL(glasscode::Union{Float64,Int}) -> Glass

Generates a glass object for the given glass code based on U.S. military standard MIL-G-174, see the MIL specification for further details.

The glass code is a six-digit number specifying the glass according to its refractive index Nd at d-light (587.5618nm), and its Abbe number Vd also taken at d-light. The resulting glass code is the value of Nd - 1 rounded to three digits, followed by Vd rounded to three digits, with all decimal points ignored. For example, N_BK7 has Nd = 1.5168 and Vd = 64.17, giving a six-digit glass code of 517642.

For Nd > 1.999 the format 1.123642 can be used representing Nd = 2.123 and Vd = 64.2.

Accuracy is poor given the low precision of the input parameters, the mean error to measured data may be significant. Behavior may differ from other optical simulation tools when using MIL glasses. The approximate dispersion calculation used these glasses is generally only valid for visible wavelengths, in this case a limit of 360nm to 750nm is imposed.

Examples

julia> index(glassfromMIL(517642), 0.5875618)
1.5170003960064509

julia> index(glassfromMIL(1.134642), 0.5875618)
2.1340008686098946

modelglass(Nd::Float64, Vd::Float64, ΔPgF::Float64) -> Glass

Generates a glass object for the given refractive index at d-light (587.5618nm), Nd, the Abbe number also at d-light, Vd, and partial dispersion, ΔPgF. The mean error to measured data for these models is typically small - usually < 0.0001. Behavior may differ from other optical simulation tools when using model glasses.

The approximate dispersion calculation used for these glasses is generally only valid for visible wavelengths, in this case a limit of 360nm to 750nm is imposed.

Examples

julia> index(modelglass(1.5168, 64.17, 0.0), 0.5875618)
1.5168003970108495

julia> index(modelglass(1.2344, 61.57, 0.003), 0.678)
1.2329425902693352

glasscatalogs()

Returns the complete list of glass catalogs available from GlassCat.

Example

julia> glasscatalogs()
41-element Array{Any,1}:
 OpticSim.GlassCat.AMTIR
 OpticSim.GlassCat.ANGSTROMLINK
 OpticSim.GlassCat.APEL
 OpticSim.GlassCat.ARCHER
 OpticSim.GlassCat.ARTON
 OpticSim.GlassCat.AUER_LIGHTING
 OpticSim.GlassCat.BIREFRINGENT
 ⋮

info([io::IO], glass::AbstractGlass)

Print out all data associated with glass in an easily readable format.

Examples

julia> info(GlassCat.RPO.IG4)
ID:                                                AGF:52
Dispersion formula:                                Schott (1)
Dispersion formula coefficients:
     a₀:                                           6.91189161
     a₁:                                           -0.000787956404
     a₂:                                           -4.22296071
     a₃:                                           142.900646
     a₄:                                           -1812.32748
     a₅:                                           7766.33028
Valid wavelengths:                                 3.0μm to 12.0μm
Reference temperature:                              20.0°C
Thermal ΔRI coefficients:
     D₀:                                           3.24e-5
     D₁:                                           0.0
     D₂:                                           0.0
     E₀:                                           0.0
     E₁:                                           0.0
     λₜₖ:                                          0.0
TCE (÷1e-6):                                       20.4
Ignore thermal expansion:                          false
Density (p):                                       4.47g/m³
ΔPgF:                                              0.0
RI at sodium D-Line (587nm):                       1.0
Abbe Number:                                       0.0
Cost relative to N_BK7:                              ?
Status:                                            Standard (0)
Melt frequency:                                    0
Exclude substitution:                              false

findglass(condition::Function) -> Vector{Glass}

Returns the list of glasses which satisfy condition where condition::(Glass -> Bool).

Example

julia> findglass(x -> (x.Nd > 2.3 && x.λmin < 0.5 && x.λmax > 0.9))
8-element Array{GlassCat.Glass,1}:
 BIREFRINGENT.TEO2_E
 BIREFRINGENT.PBMOO4
 BIREFRINGENT.LINBO3
 INFRARED.CLEARTRAN_OLD
 INFRARED.CLEARTRAN
 INFRARED.SRTIO3
 INFRARED.ZNS_BROAD
 INFRARED.ZNS_VIS

glassname(g::Union{AbstractGlass,GlassID})

Get the name (including catalog) of the glass, or glass with this ID.

glassid(g::AbstractGlass) -> GlassID

Get the ID of the glass, see GlassID.

glassforid(ID::GlassID)

Get the glass for a given ID.

polyfit_indices(wavelengths, n_rel; degree=5)

Fit a polynomial to indices at wavelengths, optionally specifying the degree of the polynomial. Returns tuple of array of fitted indices at wavelengths and the polynomial.

plot_indices(glass::AbstractGlass; polyfit=false, fiterror=false, degree=5, temperature=20°C, pressure=1Atm, nsamples=300, sampling_domain="wavelength")

Plot the refractive index for glass for nsamples within its valid range of wavelengths, optionally at temperature and pressure. polyfit will show a polynomial of optionally specified degree fitted to the data, fiterror will also show the fitting error of the result. sampling_domain specifies whether the samples will be spaced uniformly in "wavelength" or "wavenumber".