High-Reflection Coatings

Laser-Line MAX-R™ Coatings

Highest possible reflectance achieved at specific laser wavelengths and angles of incidence Standard MAX-R coatings available for popular laser wavelengths at both 0 degrees and 45 degrees Custom designs easily produced Coatings available from 193 nm to 1550 nm These multilayer coatings achieve the highest possible reflectances at specific laser wavelengths and at particular angles of incidence. At these wavelengths and angles, laser-line MAX-RTM coatings outperform MAXBRIteTM. We offer coatings for angles of incidence at 0 degrees and 45 degrees. Because the layer thicknesses differ for these two angles, the coatings cannot be used interchangeably. Laser-line MAX-R coatings are intended for external beam-manipulation applications. Specified coating reflectances apply to p-polarization (except at normal incidence, where the p- and s-polarization states are indistinguishable). Reflectances for s-polarization generally exceed those for p-polarization. Other coatings can be supplied at any center wavelength from 193 nm to 1.6 mm. The figures below show typical normalized reflectance curves for both the normal incidence and 45-degree incident coatings. The relative wavelength, g, is given by g = l0/l, where l0 is the design wavelength and l is arbitrary. For example, to determine the wavelength represented b 0.9 for a design wavelength of 1064 nm, we have     l = l0/g = 1064 nm/0.9 = 1182 nm. For values of g below 0.8 and above 1.2, the reflectance curves oscillate sinusoidally, in a manner that varies from coating to coating and run to run.

Max-R™ coating, normal incidence

Max-R™ coating, 45-degree incidence

Laser Induced Damage

The table below give typical laser damage thresholds for several of the MAX-R coatings. These statistics do not constitute a performance guarantee but should be representative for MAX-R coatings in general.

Coating Suffix	Damage Threashold
/205	2.4 J/cm2 ± 10%, 10-nsec pulse (195 MW/cm2 ) at 355 nm
/255	13.3 J/cm2 ± 10%, 12-nsec pulse (920 MW/cm2 ) at 355 nm
/225	12.6 J/cm2 ± 10%, 10-nsec pulse (1008 MW/cm2 ) at 532 nm
/275	13.6 J/cm2 ± 10%, 10-nsec pulse (1088 MW/cm2 ) at 532 nm
/241	2.4 J/cm2 ± 10%, 20-nsec pulse (700 MW/cm2 ) at 1064 nm
/291	17.7 J/cm2 ± 10%, 20-nsec pulse (800 MW/cm2 ) at 1064 nm

Laser- Line MAX-RTM Coatings, Normal Incidence
		Minimum Reflectance Rp (%)
Wavelength (nm)	Laser Type	0° Incidence	0° ± 15° Incidence	COATING SUFFIX
193	ArF	97.0	94.0	/201
248	KrF	98.0	95.0	/202
266	Nd:YAG 4th harm.	98.0	95.0	/203
308	XeCl	99.0	96.0	/204
351	Ar ion	99.0	96.0	/205
364	Ar ion	99.0	96.0	/207
442	HeCd	99.3	99.0	/209
458	Ar ion	99.5	99.3	/211
466	Ar ion	99.5	99.3	/213
473	Ar ion	99.5	99.3	/215
476	Ar ion	99.5	99.3	/217
488	Ar ion	99.5	99.3	/219
496	Ar ion	99.5	99.3	/221
502	Ar ion	99.5	99.3	/222
514	Ar ion	99.5	99.3	/223
532	Nd:YAG 2nd harm.	99.5	99.3	/225
543	HeNe	99.5	99.3	/226
633	HeNe	99.5	99.3	/229
670	GaAlAs	99.5	99.3	/228
694	Ruby	99.3	99.0	/231
780	GaAlAs	99.3	99.0	/233
830	GaAlAs	99.3	99.0	/237
850	GaAlAs	99.3	99.0	/238
904	GaAs	99.3	99.0	/239
1064	Nd:YAG	99.2	99.0	/241
1300	InGaAsP	99.2	99.0	/245
1523	HeNe	99.2	99.0	/247
1550	InGaAsP	99.2	99.0	/247

Laser-Line MAX-RTM Coatings, 45-Degree Incidence
		Minimum Reflectance Rp (%)
Wavelength (nm)	Laser Type	45° Incidence	45° ± 15° Incidence	COATING SUFFIX
193	ArF	97.0	94.0	/251
248	KrF	98.0	95.0	/252
266	Nd:YAG 4th harm.	98.0	95.0	/253
308	XeCl	98.0	95.0	/254
351	Ar ion	98.0	96.0	/255
364	Ar ion	98.0	96.0	/257
442	HeCd	99.0	98.0	/259
458	Ar ion	99.3	98.0	/261
466	Ar ion	99.3	98.5	/263
473	Ar ion	99.3	98.5	/265
476	Ar ion	99.3	98.5	/267
488	Ar ion	99.3	98.5	/269
496	Ar ion	99.5	98.5	/271
502	Ar ion	99.5	98.5	/272
514	Ar ion	99.5	98.5	/273
532	Nd: YAG 2nd harm.	99.5	98.5	/275
543	HeNe	99.5	98.5	/276
633	HeNe	99.5	98.5	/279
670	GaAlAs	99.0	98.5	/278
694	Ruby	99.0	98.5	/281
780	GaAlAs	99.0	98.5	/283
830	GaAlAs	99.0	98.5	/287
850	GaAlAs	99.0	98.5	/288
904	GaAs	99.0	98.5	/289
1064	Nd:YAG	99.0	98.0	/291
1300	InGaAsP	99.0	98.5	/295
1523	HeNe	99.0	98.5	/297
1550	InGaAsP	99.0	98.5	/297

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Optics Guide Copyright 2002 Melles Griot Inc.