Optical Coatings

More documents

Recommendations

Info

Fundamental Optics 5 typical reflectance curve 5 typical reflectance curve Material Properties Optical Specifications Gaussian Beam Optics Optical Coatings PERCENT REFLECTANCE PERCENT REFLECTANCE 4 3 2 1 400 600 800 1000 1100 WAVELENGTH IN NANOMETERS 5 4 3 2 1 normal incidence Figure 5.26 HEBBAR coating for visible and Nd:YAG wavelengths /083 $ Extremely versatile extended antireflection coating from 450 to 700 nm and 1064 nm $ Ideal for Nd:YAG laser fundamental and second harmonic $ Also performs well across the visible, including HeNe and visible diode laser lines $ Performance guaranteed from 0º–15º on BK7 substrate $ R abs < 1.25% @ 450–700 nm, R abs < 0.25% @ 1064 nm $ Damage threshold: 1.3 J/cm 2 810%, 10-nsec pulse (107 MW/cm 2 ) at 532 nm; 5.4 J/cm 2 810%, 20-nsec pulse (220 MW/cm 2 ) at 1064 nm on silica substrate normal incidence WAVELENGTH IN NANOMETERS typical reflectance curve 750 900 1150 1350 1500 Figure 5.27 HEBBAR coating for IR diode lasers /084 $ Extended antireflection coating: 780 to 830 nm and 1300 nm $ Can be used with relatively uncollimated diode laser beams $ R abs < 0.5% @ 780 nm to 830 and 1300 nm $ Damage threshold: see /083 (similar specifications at 1064 nm) PERCENT REFLECTANCE PERCENT REFLECTANCE 4 3 2 1 400 500 600 700 800 900 1000 1100 5 4 3 2 1 normal incidence WAVELENGTH IN NANOMETERS Figure 5.28 HEBBAR coating for visible and near-IR /073 $ Extended antireflection coating for 420 to 1100 nm $ Excellent broadband coating, covering the visible and near-infrared regions $ R avg
V-Coatings V-coatings are multilayer antireflection coatings that reduce the reflectance of a component to near-zero for one very specific wavelength. Our V-coatings are intended for use at normal incidence, for maximum reflectances of not more than 0.25% at their design wavelength. They are extremely sensitive to both wavelength and angle of incidence. For example, a V-coating intended for the helium neon wavelength (632.8 nm) when used at 30-degree incidence will reflect about 0.8%. At 45-degree incidence, the same coating will reflect over 2.5%. If your application involves other than normal angles of incidence or high-numerical-aperture (low f-number) optics, it may be better to use a HEBBAR coating. Experience shows that the maximum reflectance typically achieved by these coatings is often closer to 0.1% than the 0.25% we specify. Using V-coatings on fused-silica optics can therefore provide exceptionally high external transmittances. V-Coating, Normal Incidence Wavelength (nm) 193 248 266 308 351 364 442 458 466 473 476 488 496 502 514 532 543 633 670 694 780 830 850 904 1064 1300 1523 1550 Laser Type ArF ArF YAG 3rd harm. XeCl Ar ion Ar ion HeCd Ar ion Ar ion Ar ion Ar ion Ar ion Ar ion Ar ion Ar ion YAG 2nd harm. HeNe HeNe GaAlAs Ruby GaAlAs GaAlAs GaAlAs GaAs Nd:YAG InGaAsP HeNe InGaAsP Maximum Reflectance (%) 0.5 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 COATING SUFFIX /101 /102 /103 /104 /105 /107 /111 /112 /113 /114 /115 /116 /117 /118 /119 /122 /121 /123 /128 /124 /163 /166 /167 /125 /126 /168 /169 /169 The typical reflectance curve illustrated in figure 5.30 is for a V-coating on BK7 optical glass. Clearly the performance of such a coating is highly dependent on the refractive index of the component material. However, we specify all coatings by performance figures and not by design. This means that we will change the design to suit the material being coated. This makes ordering coatings simple: select the specification you want to achieve, tell us what to put it on, and we do the rest. This means that your reflectance curve may vary from the one shown on this page, but the coating will meet your requirements. In addition to the standard coatings listed here, Melles Griot can supply V-coatings at any center wavelength from 193 nm to 2000 nm. These coatings are not intended for use with high-energy lasers although the Nd:YAG coatings are suitable for many mediumpower applications including diagnostics. PERCENT REFLECTANCE 5 4 3 2 1 normal incidence typical reflectance curve 550 600 650 700 WAVELENGTH IN NANOMETERS Figure 5.30 Example of a V-coating for 632.8 nm /123 $ Near-zero reflectance at one specific wavelength and incidence angle $ Maximum reflectance often less than 0.1% $ Standard coatings available for most laser lines $ Custom center wavelengths at specific angles of incidence available per request $ Damage threshold: 4.5 J/cm 2 810%, 10-nsec pulse (361 MW/cm 2 ) at 532 nm for /122 on silica substrate; 10.6 J/cm 2 810%, 20-nsec pulse (480 MW/cm 2 ) at 1064 nm for /126 on BK7 substrate Fundamental Optics Gaussian Beam Optics Optical Specifications Material Properties Optical Coatings Visit Us Online! www.mellesgriot.com 1 5.23
Page 1 and 2:
Fundamental Optics 1 Introduction 1
Page 3 and 4:
Paraxial Formulas SIGN CONVENTIONS
Page 5 and 6:
object F 2 Figure 1.4 image Example
Page 7 and 8:
Figure 1.6 Figure 1.7 f f 2 object
Page 9 and 10:
Figure 1.8 Figure 1.9 INDIVIDUAL EL
Page 11 and 12:
Performance Factors After paraxial
Page 13 and 14:
third-order, monochromatic, spheric
Page 15 and 16:
Positive lens elements usually have
Page 17 and 18:
Lens Shape Aberrations described in
Page 19 and 20:
ay f-numbers 2.7 3.3 4.4 6.7 13.3 S
Page 21 and 22:
AIRY DISC DIAMETER = 2.44 l f/# Fig
Page 23 and 24:
Lens Selection Having discussed the
Page 25 and 26:
Example 4: Diffraction-Limited Perf
Page 27 and 28:
Aberration Balancing To improve sys
Page 29 and 30:
Definition of Terms FOCAL LENGTH (f
Page 31 and 32:
infinity (which is a comfortable vi
Page 33 and 34:
For symmetric lenses (r 2 = 4r 1 ),
Page 35 and 36:
Separation of Nodal Point from Corr
Page 37 and 38:
Gaussian Beam Optics 2 Introduction
Page 39 and 40:
Even if a Gaussian TEM 00 laser-bea
Page 41 and 42:
eam expander INCORPORATING M 2 INTO
Page 43 and 44:
M 2 AND THE LENS EQUATION For real-
Page 45 and 46: employed when laser power must be c
Page 47 and 48: Figure 2.13 Keplerian beam expander
Page 49 and 50: Optical Specifications 3 Wavefront
Page 51 and 52: Centration The mechanical axis and
Page 53 and 54: PERFECT RECTANGULAR LENS The MDMTF
Page 55 and 56: The permissible number of maximum-s
Page 57 and 58: Material Properties 4 Material Prop
Page 59 and 60: Introduction Glass manufacturers pr
Page 61 and 62: maximum value for homogeneity withi
Page 63 and 64: Melles Griot Lens Materials Melles
Page 65 and 66: Refractive Index of Five Schott Gla
Page 67 and 68: Synthetic Fused Silica Fused silica
Page 69 and 70: PERCENT INTERNAL TRANSMITTANCE 99.9
Page 71 and 72: Low-Expansion Borosilicate Glass Th
Page 73 and 74: ZERODUR ® Many optical application
Page 75 and 76: Optical Coatings 5 Optical Coatings
Page 77 and 78: OEM and Special Coatings Melles Gri
Page 79 and 80: PERCENT REFLECTANCE 100 90 80 70 60
Page 81 and 82: will depend on the ratio of optical
Page 83 and 84: v = angle of incidence PERCENT REFL
Page 85 and 86: PERCENT REFLECTANCE PER SURFACE 2.0
Page 87 and 88: Two-Layer Coatings of Arbitrary Thi
Page 89 and 90: ION-ASSISTED BOMBARDMENT Ion-assist
Page 91 and 92: Single-Layer MgF 2 Antireflection C
Page 93 and 94: PERCENT REFLECTANCE 5 4 3 2 1 norma
Page 95: EXTENDED-RANGE HEBBAR ANTIREFLECTIO
Page 99 and 100: Metallic High-Reflection Coatings W
Page 101 and 102: INTERNAL SILVER (/036) $ For intern
Page 103 and 104: Dielectric High-Reflection Coatings
Page 105 and 106: PERCENT REFLECTANCE 100 80 60 40 20
Page 107 and 108: MAXBRIte Coatings MAXBRIte (multi
Page 109 and 110: Laser-Line MAX-R Coatings These mu
Page 111 and 112: Ultrafast Coating Melles Griot has
show all

Optical Coatings

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?