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Visible Free-Space Isolators

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Visible Free-Space Isolators (395 - 690 nm)




  • Center Wavelength at 405, 488, 532, 633, 660,or 670 nm
  • Isolation up to 55dB
  • Power Densities up to 500 W/cm2
  • Custom Center Wavelengths and Higher Isolation Available Upon Request

Features

  • Minimize Feedback into Optical Systems
  • Free-Space Input and Output Ports
  • Fixed or Tunable Wavelength Ranges
  • Peak Isolation from 32 to 55 dB
  • Apertures up to Ø4.7 mm
  • Polarization-Dependent Input
  • Custom Isolators Available

Thorlabs is pleased to stock a variety of free-space optical isolators designed for use in the visible spectral range (395 - 690 nm). Optical isolators, also known as Faraday isolators, are magneto-optic devices that preferentially transmit light along a single direction, shielding upstream optics from back reflections. Back reflections can create a number of instabilities in light sources, including intensity noise, frequency shifts, mode hopping, and loss of mode lock. In addition, intense back-reflected light can permanently damage optics. Please see the Isolator Tutorial tab for an explanation of the operating principles of a Faraday isolator.

In the visible wavelength range, we offer three types of isolators. The first type, Fixed Narrowband Isolators, contains fixed, factory-aligned optics, for which peak isolation and peak transmission occurs at a pre-defined center wavelength. Any deviation from this wavelength will cause a dip in isolation and transmission. The second type, Adjustable Narrowband Isolators, offers the user the ability to adjust the alignment of the input and output polarizers, allowing tuning of the center wavelength within a 20 - 40 nm range, depending upon the exact isolator. The third type, Tandem Narrowband Isolators, consists of two Faraday rotators in series, boosting the isolation to at least 55 dB at the expense of lower transmission. 

Each isolator's housing is marked with an arrow that indicates the direction of forward propagation. In addition, all isolators have engravings that indicate the alignment of the input and output polarizers.

Thorlabs also manufactures isolators for fiber optic systems and wavelengths extending into the infrared (see the Selection Guide table to the left). As indicated in the tables below and pictured to the right, many of our stock isolators can also be provided in a mount designed for our FiberBench systems. If Thorlabs does not stock an isolator suited for your application. Thorlabs' in-house manufacturing service has over 25 years of experience and can deliver a free-space isolator tuned to your center wavelength (from 244 - 2800 nm).

Selection Guide for Isolators
Free-Space Isolators
Spectral Region Wavelength Range
UV 365 - 385 nm
Visible 395 - 690 nm
NIR 760 - 1050 nm
Nd:YAG 1064 nm
IR 1120 - 2100 nm

405 nm Polarization-Dependent Isolator

 
IO-5-405-LP Simplified Mechanical Drawing

 

 
Item # IO-5-405-LPa
Type Adjustable Narrowband
Center Wavelength 405 nm
Tuning Range 395 - 420 nm
Operating Range 390 - 425 nm
Transmissionb 84%
Isolationb 32 - 42 dB
Performance Graph
(Click for Details)
Max Beam Diameterc 4.5 mm
Max Power 10 W
Max Power Density 30 W/cm2

 

  • The mounting saddle contains an 8-32 tap.
  • Specified at center wavelength. See Performance Graph for wavelength dependence.
  • Defined as containing 100% of the beam energy.

 

488 nm Polarization-Dependent Isolators

 
IO-3-488-HP Simplified Mechanical Drawing

 

 
Item # IO-3-488-HPa IO-5-488-HP
Type Adjustable Narrowband Adjustable Narrowband
Center Wavelength 488 nm 488 nm
Tuning Range 475 - 495 nm 475 - 495 nm
Operating Range 470 - 505 nm 470 - 505 nm
Transmissionb 85% 85%
Isolationb 35 - 38 dB 35 - 38 dB
Performance Graph
(Click for Details)
Max Beam Diameterc 2.7 mm 4.7 mm
Max Power 15 W 40 W
Max Power Density 500 W/cm2 500 W/cm2

 

  • The mounting saddle contains an 8-32 tap. 
  • Specified at center wavelength. See Performance Graph for wavelength dependence.
  • Defined as containing 100% of the beam energy.

 

532 nm Polarization-Dependent Isolators


IO-3-532-LP Simplified Mechanical Drawing

 

 
Item # IO-3-532-LPa IO-5-532-HPa
Type Adjustable Narrowband Adjustable Narrowband
Center Wavelength 532 nm 532 nm
Tuning Range 522 - 543 nm 522 - 543 nm
Operating Range 510 - 550 nm 510 - 550 nm
Transmissionb 93% 89%
Isolationb 35 - 40 dB 38 - 44 dB
Performance Graph
(Click for Details)
Click for Details Click for Details
Max Beam Diameterc 2.7 mm 4.7 mm
Max Power 3 W 40 W
Max Power Density 100 W/cm2 500 W/cm2

 

  • The mounting saddle of the isolators shown here contains an 8-32 tap.
  • Specified at center wavelength. See Performance Graph for wavelength dependence.
  • Defined as containing 100% of the beam energy.

 

633 nm Polarization-Dependent Isolators


 
Item # IO-2D-633-VLPa IO-3D-633-VLPa IOT-3D-633-VLP IO-3D-633-PBSa IO-3-633-LPb IO-5-633-PBSb
Type Fixed Narrowband Fixed Narrowband Tandem Fixed Narrowband Fixed Narrowband Adjustable Narrowband Adjustable Narrowband
Center Wavelength 633 nm 633 nm 633 nm 633 nm 633 nm 633 nm
Tuning Range N/A N/A N/A N/A 613 - 653 nm 618 - 648 nm
Operating Range 603 - 663 nm 603 - 663 nm 613 - 653 nm 613 - 653 nm 603 - 663 nm 613 - 653 nm
Transmissionc 71 - 75% 71 - 75% 72% 88% 93% 86 - 90%
Isolationc 35 - 40 dB 35 - 40 dB 55 - 57 dB 30 - 36 dB 35 - 40 dB 30 - 36 dB
Performance Graph
(Click for Details)
Max Beam Diameterd 1.8 mm 2.7 mm 2.7 mm 2.7 mm 2.7 mm 4.5 mm
Max Power 0.3 W 0.4 W 0.5 W 0.7 W 3 W 1 W
Max Power Density Blocking:e 25 W/cm2
Transmission:e 100 W/cm2
Blocking:e 25 W/cm2
Transmission:e 100 W/cm2
Blocking:e 25 W/cm2
Transmission:e 100 W/cm2

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