COATING

Overview

ISP Optics manufactures and designs in house, a full spectrum of IR coatings, from Protective coating on KBr to Extreme High Durability AR Coatings on Silicon. The Coating Department utilizes four large semi- and fully automated coating chambers to manufacture standard and custom design coatings.  All coating chambers are equipped with Ion assisted electron beam technology such as HCN. Excellent repeatability and reliability is based on our continuous efforts to improve quality and delivery. With the new investments in automation technology,  ISP Optics is able to successfully handle high volume coating production without dedicated supervision.The maximum size of optics for coating is 26” diameter. All our high performance Infrared coatings are thorium free and low stress.
 

Our standard IR coatings comply with the following requirements:
24 hr Humidity (C.3.8.2 per MIL-PRF-13830B)
Adhesion (C.3.8.5 per MIL-PRF-13830B)
Moderate abrasion (C.3.8.4.2 per MIL-PRF-13830B)
Temperature cycling (4.6.9.1 per MIL-F-48616)
Cleanability and solubility (4.6.9.2 per MIL-F-48616) IR Anti-Reflection Coatings
ISP Optics offers four standard types of IR Antireflection Coatings for different IR materials: broad band coatings (BBAR), narrow band coatings (NBAR), dual band coatings (DB) and tri band coatings (TRB).


PART NUMBER DESCRIPTION CHART
     
SWIR BAND AR COATING    
BBAR-CAF2-0.8-2.5 Broad Band AR Coating for 0.8-2.5 μm Chart
BBAR-STiH6-0.9-2.5 Broad Band AR Coating for 0.9-2.5 μm Chart
BBAR-SNPH2-1.0-2.5 Broad Band AR Coating for 1.0-2.5 μm Chart
BBAR-ZNSE-0.9-2.4 Broad Band AR Coating for 0.9-2.4 μm Chart
BBAR-BD2-1.5-3.0 Broad Band AR Coating for 1.5-3.0 µm Chart
     
MWIR BAND AR COATING    
BBAR-ZNSE-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-GE-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-SI-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-CAF2-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-GAAS-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-GaSir-3-5 Broad Band AR Coating for 3-5 μm Chart
BBAR-BD2-3-5 Broad Band AR Coating for 3-5 µm Chart
     
LWIR BAND AR COATING    
BBAR-GE-8-12 Broad Band AR Coating for 8-12 μm Chart
BBAR-ZNSE-8-12 Broad Band AR Coating for 8-12 μm Chart
BBAR-CDTE-7.5-13 Broad Band AR Coating for 7.5-13 μm Chart
BBAR-GAAS-8-12 Broad Band AR Coating for 8-12 μm Chart
BBAR-AMTIR-8-12 Broad Band AR Coating for 8-12 μm Chart
BBAR-BD2-8-12 Broad Band AR Coating for 8-12 µm Chart
     
BROAD BAND AR COATING    
BBAR-ZNSE-1-12 Broad Band AR Coating for 1-12 µm Chart
BBAR-ZNSE-2-13 Broad Band AR Coating for 2-13 μm Chart
BBAR-GE-3-12 Broad Band AR Coating for 3-12 μm Chart
BBAR-GE-2-13 Broad Band AR Coating for 2-13 μm Chart
     
SINGLE / MULTI AR COATING    
NBAR-GE-3.39 Narrow Band AR Coating for 3.39 μm Chart
NBAR-ZNSE-3.39 Narrow Band AR Coating for 3.39 μm Chart
DB-ZNS-1.064-1.570 Dual Band Coating for 1.064,1.570 μm Chart
DB-ZNSE-1.5-5.0+8-14 Dual Band Coating for 1.5-5.0+8-14 μm Chart
TRB-CAF2-1.06-1.57-3.4-5.0 Tri Band Coating for 1.06,1.57,3.4-5 μm Chart
TRB-ZNSE-1.06-1.57-3.4-5.0 Tri Band Coating for 1.06,1.57,3.4-5 μm Chart
TRB-ZNSE-0.633-3.39-10.6 Tri Band Coating for 0.633,3.39,10.6 μm Chart

IR Beamsplitters Coatings

ISP Optics offers high performance beamsplitter coatings,
with 50% of the incident beam transmitted and 50% reflected.

CaF2 Beamsplitter plate 50/50
One side is the coated infrared beamsplitter surface and the other side is uncoated.
PN# BSP-50-CaF2-1.5-5.0;
R/T=50/50+/-10% at 1.5-5.0µm(SWIR-MWIR) + T>2% at 633nm @ 45+/-5 degree AOI
PN# BSP-50-CaF2;
R/T=50/50+/-10% at 2-8µm(MWIR) + T>5% at 633nm @ 45+/-5 degree AOI
 

ZnSe Beamsplitter plate 50/50
One side is the coated infrared beamsplitter surface and the other side is AR coated.
R/T=50/50+/-10% at 7-14um(LWIR), 45+/-5 degree AOI.
R/T=50/50+/-15% at 5-16um, 45+/-5 degree AOI.

ISP Optics offers two types of dichroic beamsplitters that separate IR from VIS.

"Gold" dichroic beamsplitter transmits visible range (0.4-0.7 µm, Tavg>70%) and reflects infrared range (3-12 µm, Ravg>94%).
"Platinum" dichroic beamsplitter reflects visible range (0.4-0.7 µm, Ravg>85%) and transmits infrared range (3-12 µm, Tavg>85%).
 


PART NUMBER DESCRIPTION CHART
BSP-50-CAF2-1.5-5.0 50/50 Beamsplitter Coating for 1.5-5.0 μm(SWIR+MWIR) Chart
     
BSP-50-CAF2 50/50 Beamsplitter Coating for 2-8 μm(MWIR) Chart
     
BSP-50-ZNSE 50/50 Beamsplitter Coating for 7-14 μm(LWIR) Chart
     
BSP-DI-GOLD Beamsplitter Dichroic Coating Gold Chart
     
BSP-DI-PLATINUM Beamsplitter Dichroic Coating Platinum Chart

IR Protective Coatings

ISP Optics offers three standard types of protective coatings: high durability coating (HD), DLC and humidity protections coatings(PRH).

ISP Optics “Xtreme High Durability BBAR” protective coating provides high efficiency, non-radioactive antireflection with excellent durability characteristics for the MWIR 3 – 5 µm region. Designs are available for deposition onto a variety of IR optical materials including: Ge, Si, ZnS, ZnSe and CaF2.High durability (HD) coatings are applied to optical surfaces which are exposed to harsh environmental conditions. Xtreme Hi-Dur BBAR coatings withstand humidity, salt fog, and severe abrasion and are an alternative to DLC in situations where passing the windshield test is not required.

Hydrogenated diamond-like coatings (DLC) are used when the environmental conditions are considered harsh. It provides the toughest coating surface available in optics.

Our humidity protection high performance coatings (PRH) shield the KBr and NaCl optical elements from absorption caused by humidity or water.


PART NUMBER DESCRIPTION CHART
     
HD-GE-3-5 High Durability AR Coating for 3-5 μm Chart
     
HD-SI-3-5 High Durability AR Coating for 3-5 μm Chart
     
DLC-AR-GE-8-12 DLC AR Coating for 8-12 μm Chart
     
DLC-AR-SI-3-5 DLC AR Coating for 3-5 μm Chart
     
PRH-KBR-0.5-20 Humidity Protective Coating for 0.5-20 μm Chart
     
PRH-NACl-0.5-15 Humidity Protection Coating for 0.5-15 μm Chart

IR Reflective Coatings
ISP Optics offers gold, silver and aluminum high performance coatings for front and rear mirror surfaces.


PART NUMBER DESCRIPTION CHART
     
P-FS-AU-M Protected Gold Front Surface Mirror Chart
     
B-FS-AU-M Bare Gold Front Surface Mirror Chart
     
P-FS-AG-M Protected Silver Front Surface Mirror Chart
     
P-FS-Al-M Protected Aluminum Front Surface Mirror Chart
     
RS-AG-M Rear Surface Silver Mirror Chart
     
RS-AI-M Rear Surface Aluminum Mirror Chart

Capabilities

ISP manufactures a full range of coating services in house.  

  • High Efficiency Antireflection from single to multi bands
  • High Durability Antireflection from single to multi bands
  • Low absorption antireflection coating
  • Beam splitter / Beam combiner from single band to broad bands
  • Custom dichroic beam splitter
  • Polarizer, Non-polarizer and phase retarder.
  • Filters ( Long pass and Short pass filter, Band pass filter and ND filter and etc.)
  • Metallic mirror coating (Gold, Silver, Aluminum and exotic metal and alloys)
  • Dielectric reflector (high reflector and partial reflector)
  • Metallization on various substrates
  • Moisture protective coating on hygroscopic materials (KBr and KRS etc.)

​​

Equipment

ISP OPTICS utilizes five optical coating systems from a semi-automatic Balzer 760 to a fully automated optical coating system and DLC (Diamond-Like Carbon) coating chamber. We primarily focus on ion assisted E-beam deposition technology which is still the most widely used and reliable technology in the infrared optical coating industry. Our 36"-48" inch box coaters have provided excellent batch to batch repeatability producing consistent infrared coating results. 

ISP OPTICS can test film durability per US Mil-specifications in house and offers adhesion, abrasion and humidity tests for every order, in addition to temperature cycling and salt fog test offered optionally.

Metrology

ISP OPTICS has capability of spectral measurement for 193nm-25µm at any polarization angles of incidence with the followings instruments.

  Perkin Elmer Spectrum 100 FTIR 

  Perkin Elmer 983 Infrared spectrophotometer

  Perkin Elmer Lambda 9 UV/VIS/NIR spectrophotometer

  Carry UV/VIS 14DS spectrophotometer

Four spectrophotometers linded up in coating engineering room

Quality Assurance

ISP OPTICS has long been commited to provide our customers with the highest quality coating services and on-time delivery. Inside the MIL SPEC inspection booth, coated optical elements are carefully inspected with a scratch-dig standard. Concurrently a witness sample from the same coating run is subjected to environmental testing, as standard procedure. An engineer verifies coating performance with a spectral measurement. A QA engineer then reviews all resuls to ensure full compliance with the customers's specifications.

Optics Inspection booth manufactured per US Mil-specification

Final inspection of coated ZnSe window


Scratch-Dig standard measurement tool

ZnSe windows loading into fixture for coating service