IR Laser Optics - Holographic Wire Grid

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IR Laser Optics - Holographic Wire Grid Polarizers

—	Holographic Wire Grid Polarizers
—	Overcoatings
—	Standard Sizes and Options
—	Highlights
—	Specifications

HOLOGRAPHIC WIRE GRID POLARIZERS
Working with experts in the field, Optometrics has developed a special holographic technique to produce Infrared Polarizers with sub-micron grid spacing. In the Companys holographic laboratory, an interferometrically generated interference pattern is produced from monochromatic light and exposed onto a photo-resist coated substrate. Once developed, the resist has a regular sinusoidal profile which is vacuum aluminized at an oblique angle to create the array of parallel conductors.

The fabrication of holographic wire grid polarizers permits the use of a wide variety of infrared materials that do not lend themselves to the ruling process. They are available with a spacing of 2700 grooves/mm for optimum short-wavelength efficiency.

OVERCOATINGS

Calcium Fluoride and Barium Fluoride have low refractive index (high Tx) values and do not require anti-reflective (AR) coatings.

Zinc Selenide has a high refractive index and transmission at specific wavelength regions which can be enhanced by an AR coating on the rear surface only. Zinc Selenide is usually optimized for transmission at specific laser lines, typically from 9 to 11 microns.

KRS-5 is not normally AR coated, because this would limit its broad transmission range, which is its primary advantage.

Germanium is AR/AR coated to maximize transmission @ 10.6 microns.

STANDARD SIZES AND OPTIONS
Holographic wire grid polarizers are currently available in a standard 25 mm diameter size, unmounted or mounted in a double protective ring, 38 mm diameter unmounted, 50 mm diameter mounted in a double protective ring and our newest line for FTIR Spectrometers in a 360° rotary mount with a 25 mm diameter clear aperture.

If your application requires a different size or shape, please contact us for price and delivery. OEM inquires are welcome.

HIGHLIGHTS

2700 grooves/mm
On Calcium Fluoride (CaF2), Barium Fluoride (BaF2), Zinc Selenide (ZnSe), KRS-5 and Germanium (Ge)
For improved short wavelength performance
Extended infrared range
High transmission
High extinction ratios
360° bench mountable, rotary stage for FTIR spectrometers
All polarizers can be mounted in a double protective ring

SPECIFICATIONS

Wire grid spacing 2700 grooves/mm (nominal)
Parallelism: ≤ 3 arc minutes
Substrate thickness 2 mm nominal
Ring thickness: ± 0.1 mm
Dimensional Tolerance: ±0.5 mm

Nominal Extinction Ratios
Material	Wavelength(microns)	Typical Extinction Ratio
CaF₂	3 8	150 300
BaF₂	3 10	150 300
ZnSe	3 10	150 300
KRS-5	3 10	150 300
Ge (AR\AR)	10.6	300

CAUTION: The surface of a wire grid polarizer, like any diffraction grating, is extremely delicate. Nothing should ever be allowed to touch the surface of the polarizer. Handling, when necessary, should be by the edge only and with protected fingers. Careful removal of dust by gentle air flow is the only cleaning procedure recommended by Optometrics. Particular care should be used when handling KRS-5.

Unmounted

CATALOG NO.

5-8003

5-8103

5-8203

5-8303

5-8403

5-8004

5-8104

5-8204

SUBSTRATE

ZnSe

CaF₂

BaF₂

KRS-5

GE (AR/AR)

ZnSe

CaF₂

BaF₂

CLEAR
APERTURE

22.5 mm

25 mm

OUTSIDE
DIMENSIONS

25 mm dia.

29 mm dia.

* Prices are in USD and are list prices only.

Unmounted

CATALOG
NO

5-8304

5-8404

5-8011

5-8111

5-8211

5-8311

5-8411

5-8015

5-8115

5-8215

5-8315

5-8415

SUBSTRATE

KRS-5

GE (AR/AR)

ZnSe

CaF₂

BaF₂

KRS-5

GE (AR/AR)

ZnSe>

CaF2

BaF2

KRS-5

GE (AR/AR)

CLEAR
APERTURE

25 mm

34 mm

45 mm

OUTSIDE
DIMENSIONS

29 mm dia.

38 mm dia.

50 mm dia.

Price($)*

1,325

1,385

1,415

1,125

1,195

1,625

1,795

1,475

2,195

3,295

2,650

* Prices are in USD and are list prices only.

Mounted (Protective Double Ring)

CATALOG NO.

5-8001

5-8101

5-8201

5-8301

5-401

5-8031

5-8131

SUBSTRATE

ZnSe

CaF₂

BaF₂

KRS-5

GE (AR/AR)

ZnSe

CaF₂

CLEAR
APERTURE

18 mm

25 mm

OUTSIDE
DIMENSION

25 mm dia.

35 mm dia.

RING THICKNESS
mm

5.0

PRICE($)*

1,100

895

1,075

1,195

1,275

1,325

1,110

* Prices are in USD and are list prices only.

Mounted (Protective Double Ring)

CATALOG NO.

5-8231

5-8331

5-8021

5-8121

5-8221

5-8321

5-8421

SUBSTRATE

BaF₂

KRS-5

ZnSe

CaF₂

BaF₂

KRS-5

GE (AR/AR)

CLEAR
APERTURE

25 mm

34 mm

OUTSIDE
DIMENSION

35 mm dia.

50 mm dia.

RING THICKNESS
mm

5.0

6.0

PRICE($)*

1,275

1,535

1,540

1,250

1,300

1,400

1,785

* Prices are in USD and are list prices only.

Mounted in 3600 Rotary Mount with adapter, post and breadboard screws suitable for breadboards, bench mounting and FTIR spectrometer applications.
CATALOG NO.	5-8005	5-8105	5-8205	5-8305	5-8405
SUBSTRATE	ZnSe	CaF₂	BaF₂	KRS-5	GE (AR/AR)
CLEAR APERTURE	25 mm	25 mm	25 mm	25 mm	25 mm
PRICE($)*	2,115	1,855	1,990	2,225	2,450

* Prices are in USD and are list prices only.

Mounted in 3600° Rotary Mount with adapter, post and breadboard screws suitable for breadboards, bench mounting and FTIR spectrometer applications.
CATALOG NO.	5-2146	5-2147	5-2148
DESCRIPTION	Rotary stage. Bench mountable stage allows 360 rotation of wire grid polarizer in 25 mm diameter protective ring.	Rotary stage. Bench mountable stage allows 360 rotation of wire grid polarizer in 50 mm diameter protective ring.	Adapter. Allows 15 mm square wire grid polarizers to be used in 5-2146 rotary stage.
PRICE($)*	230.00	385.00	80.00

* Prices are in USD and are list prices only.

Optometrics 8 Nemco Way, Stony Brook Industrial Park, Ayer, MA 01432 USA
Phone: (978) 772-1700 Fax: (978) 772-0017