300mW–100W Optical Isolator Power Selection
An optical isolator is selected by its stated average-power limit, wavelength and pulse conditions together. A 300mW, 2W, 10W, 20W or 50W/100W designation identifies a configuration to review; it does not establish interchangeable fiber, isolation, cooling or package specifications. Model 008 is the 50W/100W TGG model.
Selection is based on the optical function, the selected product specification and the confirmed fiber interfaces. KernsOptic reviews the available application information before quotation.
Define the power at the installed component
The relevant input is the optical power reaching the isolator at its actual position in the system. Seed output, amplifier output and residual pump light are different quantities. A system output rating cannot be assigned directly to a component installed earlier in the optical path. The review should identify the light entering each interface and the direction of propagation.
For continuous-wave operation, record the maximum average power expected during normal operation and adjustment. For pulsed operation, also record pulse duration, repetition rate and the available pulse-energy or peak-power information. Average power and peak power describe different loading conditions. One cannot be substituted for the other when evaluating the selected product table.
Compare power classes without combining their specifications
The table below uses individual product pages as its source. Model 003 lists a 300mW CW limit, while Model 004 lists 2W CW and separates insertion-loss limits by applied input power. Model 005 lists 10W maximum average power. Model 006 contains several specified power configurations through 20W. Model 008 lists 50W and 100W options.
These examples do not form a continuous adjustment range for one device. The 2W model's loss limits cannot be replaced with the 10W model's typical loss, and the isolation of a dual-stage model cannot be attributed to a single-stage configuration. Model 007 is a dual-stage TGG design with its own table; its identity must remain separate from the 50W/100W Model 008.
Read optical limits under their stated conditions
Insertion loss determines the transmitted-power budget, while isolation describes suppression of reverse propagation under the stated measurement definition. A typical isolation value and a minimum isolation value serve different purposes. The wavelength, temperature and stage configuration attached to each value should be retained in a comparison.
The 1064nm product label does not establish performance at every nearby wavelength. A source centered at another wavelength requires comparison with the operating range of the selected configuration. The main optical isolator selection guide explains how wavelength, polarization and return paths relate to this choice; the power classification supplements that review.
Review fiber, mounting and pulse operation separately
Fiber geometry and polarization requirements should accompany the power request. For PM systems, the fiber interface and axis requirement affect the completed assembly. Bare fiber, connector termination and pigtail routing should be described as configuration details rather than assumed from the power class. Connector suitability must be confirmed for the selected operating conditions.
Package dimensions are model-specific. Model 008 lists 76 × 38 × 35 mm in its specification, whereas Model 006 lists 58 × 28 × 26 mm. Mounting and cooling requirements should be taken from the selected product's notes and the confirmed build, for that operating condition.
Prepare a reviewable quotation request
A request can begin with the application, wavelength and expected power even when some interfaces remain open. Known pulse conditions, fiber types, preferred terminations, available space and quantity provide additional context. KernsOptic engineering can identify which unresolved items materially affect the configuration or quotation.
The product specification remains the acceptance reference. A comparison guide narrows the candidate models but does not replace configuration confirmation. Samples and pilot quantities are quoted after review; standard production and testing is assessed on the established 4–10 week basis, depending on materials and the selected configuration.
Product specification comparison
The values below belong to the linked product specifications. Options separated by a slash refer to the configurations identified in that model table.
| Model | Parameter | Product specification |
|---|---|---|
| Model 003 | Center Wavelength | 1064 nm |
| Model 003 | Max. Optical Power (CW) | 300 mW |
| Model 004 | Center Wavelength | 1064 nm |
| Model 004 | Max. Power Handling (CW) | 2 W |
| Model 005 | Center Wavelength | 1064 / 1030 nm |
| Model 005 | Max. Average Power | 10 W |
| Model 006 | Center Wavelength | 1064, 1030, 980, 780 or specified nm |
| Model 006 | Max. Average Power | 0.3, 1, 5, 10, 20 or specified W |
| Model 008 | Center Wavelength | 1064, 1030, 980 or specified nm |
| Model 008 | Max. Average Power | 50 / 100 W |
Frequently asked questions
Is Model 008 a 20W optical isolator?
No. Model 008 lists 50W and 100W maximum average-power options. Model 006 contains listed configurations through 20W.
Does a CW rating establish pulse suitability?
No. Pulse duration, repetition rate and peak-power or pulse-energy information must be reviewed alongside the average-power limit.
Can isolation values be transferred between power classes?
No. Isolation must be read from the selected model and stage configuration under its stated wavelength and temperature conditions.
Which package dimensions apply to Model 008?
The Model 008 specification lists 76 × 38 × 35 mm. Final mounting and cooling requirements are reviewed for the selected configuration.
Selection resources and quotation
Related product family and specifications
Optical Isolator vs Circulator: How to Choose
Insertion Loss vs Isolation: Reading Optical Specs Like an Engineer
Request a Quote