Faraday Optical Isolator, Free-Space

Broad free space optical isolator offering
High Verdet constant
Low absorption coefficients
High damage thresholds
Tunability over a broad spectral range

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Overview
Specifications
Ordering
Drawings
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A Faraday Optical Isolator is essentially a magneto-optic device working like a uni-directional light valve. Use it to protect a laser source from destabilizing feedback or actual damage from back-reflected light. Newport offers free space optical isolators packaged in a compact cylinder with a base plate for ease of mounting into an optical train. Our offering includes: ISO-FRDY Series high power (wavelength range 1013 - 1077 nm), Broadband (720 - 950 nm Ti:Sapphire) optical isolators, and LP Series low-power (630 - 1030 nm) and MP Series medium-power isolators (500 - 1030 nm). The -W suffix in each model indicates an added 1/2 wave plate at the output stage so that the direction of the output beam polarization can be rotated to a desired direction.
The LP Series utilizes field proven, high efficiency Corning Polarcor™ polarizers ideal for laser diode applications. The MP Series uses a higher damage threshold BK-7 polarizing beamsplitter (PBS) and provides double escape ports for applications where rejected power exceeds 0.5 W. The ISO-FRDY Series offers high pulse damage thresholds in the NIR range.
The broadband Faraday isolators are ideal for individual amplifier isolation in a Ti:Sapphire chain while maintaining the ability to tune rapidly over the amplifier bandwidth or isolating a femtosecond oscillator from a Ti:Sapphire regenerative amplifier. These provide the advantage of operating over a wide spectral range without requiring manual adjustments. The -G version and -P version differ by the polarizer material: glan laser calcite and PBS, respectively.

Broadband optical isolator

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Wavelength Tunable LP Series Specifications

Model	ISO-04-650-LP	ISO-04-780-LP	ISO-04-850-LP	ISO-04-980-LP
Clear Aperture (mm)	4
Center Wavelength (nm)	650	780	850	980
Spectral Range (nm)	630–700	720–840	840–960	960–1030
Isolation (dB) @ 25°C	30-35	30–38	30–38	30–38
Transmission (%) @ 25°C	>75	>82	>88	>90
CW Damage Threshold (W/cm²)	25
Polarizer Type	Dichroic Glass Polarizer

1. LP series optical isolators utilize Corning Polarcor^TM and there is no escape port.
2. LP series optical isolators have a temperature dependence. Specifications quoted above are for 25°C ±8°C.
3. Storage temperature for these isolators should not exceed 70°C
4. Wavelength tuning: Please consult Users Guide for instruction for tuning of these isolators for a specific wavelength.
5. These devices contain strong magnets. Do not attempt to disassemble your Faraday isolator.
6. To order with a 1/2 waveplate use -W extension.

Wavelength Tunable MP Series Specifications

Model	ISO-04-532-MP	ISO-04-650-MP	ISO-04-780-MP	ISO-04-850-MP	ISO-04-980-MP
Clear Aperture (mm)	4
Center Wavelength (nm)	532	650	780	850	980
Spectral Range (nm)	500–600	600–680	720–830	800–900	900–1030
Isolation (dB) @ 25°C	27–32	27–32	27–35	27–35	27–35
Transmission (%) @ 25°C	>88
CW Damage Threshold (kW/cm²)	2
Pulse Damage Threshold (J/cm²), for 10ns pulses	1
Polarizer Type	PBS Cube Polarizer

1. Escape Ports: MP Isolators contain PBS cubes with double escape ports on the input and output of the isolator. For rejected powers exceeding 0.5 W the escape ports should be used. Please make sure beams exiting the escape ports are properly terminated.
2. MP series isolators have a temperature dependence. Specifications quoted above are for 25°C ±8°C.
3. Storage temperature for MP series isolators should not exceed 70°C.
4. Wavelength tuning: Please consult the Users Guide for instructions on wavelength tuning of these isolators.
5. These devices contain strong magnets. Do not attempt to disassemble your Faraday isolator.
6. To order with a 1/2 waveplate use -W extension.

Broadband Isolator Specifications

Model	ISO-05-800-BB-G	ISO-05-800-BB-P
Polarization Direction of Input Beam	Horizontal Polarization
Clear Aperture (mm)	5
Center Wavelength (nm)	800
Spectral Range (nm)	720–950
Isolation (dB) @ 25°C	≥30
Transmission (%) @ 25°C	≥92	≥88
Pulse Damage Threshold (MW/cm²) For a 10 ns pulse	300	100
Polarizer Type	Glan Laser Calcite	PBS Cube
Rotating Medium	Terbium Gallium Granet	Terbium Gallium Granet

1. Polarization Orientation: Please note that the broadband rotators and isolators utilize a 45° crystal quartz rotator. At the center wavelength there will be ≈ 90° polarization rotation in the forward direction. In the reverse direction, there will be ≈ 0° polarization rotation across the entire spectral bandwidth of the device.
2. Dispersion: Some pulse broadening does occur when using Newport's broadband isolator. Use the following Sellmeier Equation to calculate the dispersion in the Terbium Gallium Garnet material:

3. Operating and Storage Temperature: Performance of Newport's broadband rotators/isolators is related to operating temperature.

High-Power 1030 nm –1064 nm Isolators Specifications

Model	ISO-FRDY-04	ISO-FRDY-08
Clear Aperture (mm)	4	8
Center Wavelength (nm)	1030, 1050, and 1064 nm
Spectral Range (nm)	+/-13 nm of specified wavelength
Isolation (dB) @ 25°C, 1064nm	≥30
Transmission (%) @ 25°C, 1064nm	≥92
CW Damge Threshold (MW/cm²)	1
Pulse Damage Threshold (J/cm²) for 10 ns pulse	5
Rotating Medium	Terbium Gallium Granet

1. Operating Temperature: Performance of Newport's Faraday isolators is related to operating temperature. For information on the effect of operating temperature, please refer to the product support tab at Newport's website or contact us directly.
2. Escape Ports: All high power 1030–1080 nm isolators come standard with double escape ports on both the input and output polarizer assemblies. These escape ports can be adjusted by the customer to be either open or closed. If rejected average power exceeds 0.5 W or rejected energy exceeds 50 mJ (10 ns pulse), Newport recommends the escape ports be used. Failure to use the escape ports under these conditions could result in optical damage or degrade the performance of your isolator. Please consult User’s Guide on how to use the escape ports.
3. Newport's Faraday isolators provide ≥30 dB isolation for beams having a 1/e² beam diameter ≤2/3 of the clear aperture.
4. To order with a 1/2 waveplate use -W extension.

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
ISO-04-532-MP	Faraday Optical Isolator, 4 mm, 532 nm, Medium Power	0	In Stock	2090	$2,090.00	ADD
ISO-04-532-MP-W	Faraday Optical Isolator, 4 mm, 532 nm, Medium Power, 1/2 Wave Plate	5	5 Weeks	2413	$2,413.90	ADD
ISO-04-650-LP	Faraday Optical Isolator, Free Space, 4 mm, 650 nm, Low Power	0	In Stock	1850	$1,850.00	ADD
ISO-04-650-LP-W	Faraday Optical Isolator, Free Space, 4 mm, 650 nm, Low Power, 1/2 Wave Plate	5	5 Weeks	2110	$2,110.90	ADD
ISO-04-650-MP	Faraday Optical Isolator, 4 mm, 650 nm, Medium Power	0	In Stock	2090	$2,090.00	ADD
ISO-04-650-MP-W	Faraday Optical Isolator, 4 mm, 650 nm, Medium Power, 1/2 Wave Plate	5	5 Weeks	2590	$2,590.00	ADD
ISO-04-780-LP	Faraday Optical Isolator, Free Space, 4 mm, 780 nm, Low Power	3	3 Weeks	1850	$1,850.00	ADD
ISO-04-780-LP-W	Faraday Optical Isolator, Free Space, 4 mm, 780 nm, Low Power, 1/2 Wave Plate	5	5 Weeks	2290	$2,290.00	ADD
ISO-04-780-MP	Faraday Optical Isolator, 4 mm, 780 nm, Medium Power	0	In Stock	2090	$2,090.00	ADD
ISO-04-780-MP-W	Faraday Optical Isolator, 4 mm, 780 nm, Medium Power, 1/2 Wave Plate	0	In Stock	2590	$2,590.00	ADD
ISO-04-850-LP	Faraday Optical Isolator, Free Space, 4 mm, 850 nm, Low Power	0	In Stock	1850	$1,850.00	ADD
ISO-04-850-LP-W	Faraday Optical Isolator, Free Space, 4 mm, 850 nm, Low Power, 1/2 Wave Plate	5	5 Weeks	2110	$2,110.90	ADD
ISO-04-850-MP	Faraday Optical Isolator, 4 mm, 850 nm, Medium Power	0	In Stock	2090	$2,090.00	ADD
ISO-04-850-MP-W	Faraday Optical Isolator, 4 mm, 850 nm, Medium Power, 1/2 Wave Plate	5	5 Weeks	2590	$2,590.00	ADD
ISO-04-980-LP	Faraday Optical Isolator, Free Space, 4 mm, 980 nm, Low Power	2	2 Weeks	1850	$1,850.00	ADD
ISO-04-980-LP-W	Faraday Optical Isolator, Free Space, 4 mm, 980 nm, Low Power, 1/2 Wave Plate	5	5 Weeks	2290	$2,290.00	ADD
ISO-04-980-MP	Faraday Optical Isolator, 4 mm, 980 nm, Medium Power	0	In Stock	2090	$2,090.00	ADD
ISO-04-980-MP-W	Faraday Optical Isolator, 4 mm, 980 nm, Medium Power, 1/2 Wave Plate	5	5 Weeks	2590	$2,590.00	ADD
ISO-05-800-BB	Broadband Optical Isolator, PBS Cube, 720 - 950 nm	5	5 Weeks	2790	$2,790.00	ADD
ISO-05-800-BB-G	Broadband Optical Isolator, Glan Laser Calcite, 800 nm Center	0	In Stock	3019	$3,019.90	ADD
ISO-05-800-BB-P	Broadband Optical Isolator, PBS Cube, 800 nm Center	0	In Stock	3019	$3,019.90	ADD
ISO-FRDY-04-1030-N	Faraday Optical Isolator, 4 mm, 1030 nm, No Waveplate	4	4 Weeks	2890	$2,890.00	ADD
ISO-FRDY-04-1030-W	Faraday Optical Isolator, 4 mm, 1030 nm, 1/2 Waveplate	4	4 Weeks	3090	$3,090.00	ADD
ISO-FRDY-04-1050-N	Faraday Optical Isolator, 4 mm, 1050 nm, No Waveplate	4	4 Weeks	2890	$2,890.00	ADD
ISO-FRDY-04-1050-W	Faraday Optical Isolator, 4 mm, 1050 nm, 1/2 Waveplate	4	4 Weeks	3090	$3,090.00	ADD
ISO-FRDY-04-1064-N	Faraday Optical Isolator, 4 mm, 1064 nm, No Waveplate	9	9 Weeks	2890	$2,890.00	ADD
ISO-FRDY-04-1064-W	Faraday Optical Isolator, 4 mm, 1064 nm, 1/2 Waveplate	4	4 Weeks	3090	$3,090.00	ADD
ISO-FRDY-08-1030-N	Faraday Optical Isolator, 8 mm, 1030 nm, No Waveplate	4	4 Weeks	3650	$3,650.00	ADD
ISO-FRDY-08-1030-W	Faraday Optical Isolator, 8 mm, 1030 nm, 1/2 Waveplate	4	4 Weeks	4090	$4,090.00	ADD
ISO-FRDY-08-1050-N	Faraday Optical Isolator, 8 mm, 1050 nm, No Waveplate	4	4 Weeks	3650	$3,650.00	ADD
ISO-FRDY-08-1050-W	Faraday Optical Isolator, 8 mm, 1050 nm, 1/2 Waveplate	4	4 Weeks	4090	$4,090.00	ADD
ISO-FRDY-08-1064-N	Faraday Optical Isolator, 8 mm, 1064 nm, No Waveplate	4	4 Weeks	3650	$3,650.00	ADD
ISO-FRDY-08-1064-W	Faraday Optical Isolator, 8 mm, 1064 nm, 1/2 Waveplate	9	9 Weeks	4090	$4,090.00	ADD