Independent evaluation and repair engineering for seeded picosecond sources, amplified fiber and solid-state platforms, and the conversion stages built on top of them. The work starts by establishing where in the chain optical power stops existing.
Picosecond systems from different manufacturers look nothing alike from the outside and are remarkably similar inside. For diagnostic purposes the useful model is a chain, and the job is to find the link where optical power stops.
Almost every difficult picosecond fault comes down to one question: is the problem upstream or downstream of a given point in this chain. Everything on this page is organized around answering that question cheaply and in the right order.
The system powers up and reports normally while measured power is a small fraction of expected, or indistinguishable from background.
Commanded values change the displayed reading with no physical effect. A command-path or protection-state problem until proven otherwise.
Repetition rate and sync outputs behave correctly. The timing electronics are alive. The optical chain may be entirely dead.
Pump diode degradation, progressive fiber-interface damage, contamination or a slow drift in the feedback path.
Power that fluctuates, drops out and returns, or depends on ambient temperature. Thermal control, connector integrity and marginal driver behavior.
Missing pulses, amplitude modulation across the train, incorrect response to external trigger, or master and slave synchronization that will not lock.
The genuine conversion-stage case, distinguished from all of the above by the fundamental power confirmed at the stage input.
Protection states that shut the system down, and protection states that quietly cap it without reporting anything.
Send the model, a photograph of the product label and the symptoms. We review it and respond with the next step.
These four are worth eliminating before anything invasive happens, because each one can produce a symptom that looks like a different fault.
Many systems display the commanded setpoint rather than a sensed value. If the command reaches the display layer but not the current driver, the panel reads perfectly while nothing changes physically. Measure the drive current at the hardware and establish whether the readback path is a measurement or an echo.
The trigger and synchronization electronics run independently of the optical chain. A clean repetition-rate reading and a healthy sync output confirm the timing board. Whether optical pulses exist is a separate measurement made with fast photodetection on the real beam.
A fiber-coupled power meter used on a free-space beam collects an unknown fraction of the light. A sensor calibrated at one wavelength misreports another. A detector operated near its noise floor produces a number that looks like a measurement and is not. Before any small reading is interpreted, the noise floor has to be established and the measurement repeated with calibrated free-space detection and wavelength-selective optics.
When a system with a conversion stage produces low visible output, the crystal is the intuitive suspect and usually the wrong one. Second-harmonic generation cannot produce more than the fundamental delivered into it. If the converted reading and the fundamental reading are of the same order, the arithmetic does not describe a working conversion process, and the real question is what is happening upstream. This is covered in detail on the SHG and harmonic generation page.
Every engagement names its measurements before it starts. PhaseX defines and provides the measurement capability the project requires. Depending on the system and the question being answered, that is owned, rented or qualified third-party measurement resources arranged as required. The evaluation proposal states which measurements will be made, by what method, and where each one comes from, together with the acceptance criteria the work is judged against.
| Measurement | What it establishes |
|---|---|
| Drive current against command | Whether a commanded setpoint reaches the driver and produces real current, which separates a control-path fault from an optical one |
| Supply, rail and protection behavior | Rail integrity under load, sequencing, and protection states that cap output without reporting anything |
| Timing, trigger and switching | Trigger and synchronization paths, driver and Pockels cell switching, and pulse-train structure |
| Optical power and pulse energy by wavelength | Real output at each wavelength on a defined and terminated path, with the detector, wavelength response, attenuation and measurement point stated |
| Optical pulse presence and repetition rate | Whether an optical pulse train exists at all, and its relationship to the trigger |
| Spectral condition | Emission wavelength and bandwidth, and confirmation that the light being measured is the light assumed |
| Beam and mode condition | Spatial condition of the output, and evidence of optic, fiber or alignment damage in the delivery path |
| Thermal behavior under load | Cooling loops, TEC and oven control, and thermal derating that presents as a silent power limit |
| Pulse duration and beam quality | Specified where the project requires it, and performed with the measurement resource identified in the proposal |
In-house instrumentation currently includes a RIGOL MHO984 oscilloscope and a Joulescope JS320 for electrical, current, timing and pulse-train work. Optical metrology is specified per project and provided through owned, rented or qualified third-party measurement resources arranged as required and named in the proposal. We do not publish an equipment inventory in place of a measurement plan, and we do not offer manufacturer-equivalent calibration or certification to original published specifications where the original acceptance data and the corresponding standards are unavailable.
We provide independent service and repair support across seeded and amplified picosecond platforms, including the manufacturers below.
We provide independent service and repair support across the platforms below. Configuration, parts access and required metrology decide the scope of a given job. Tell us your configuration and we will confirm the scope and the shipping list.
Dedicated manufacturer pages: Onefive / NKT KATANA. Additional manufacturer hubs are published as the underlying documentation is verified.
A system that cannot be brought to its normal operating state on the bench cannot be diagnosed. We receive systems from outside the United States and will provide the commercial documentation a repair shipment normally requires, but customs classification, duties and clearance timing remain the sender's responsibility and we do not give customs guarantees.
Class 4 work is planned and executed under a project-specific laser safety plan. The required engineering controls, personal protective equipment, beam management and facility conditions are defined in writing before any energized optical work begins, and the infrastructure that plan calls for is provided within the project scope. Where a laboratory's own controls are involved, final hazard analysis and approval stay with the institution's LSO or EHS function.
PhaseX Laser Services is an independent third-party service provider and is not affiliated with, authorized by, or endorsed by the manufacturers listed unless expressly stated in writing. Brand names and model names are used only to identify equipment for which customers may request evaluation.
How a conversion stage is actually tested, and why it is so often blamed for an upstream fault.
Read the pageA worked example of the low-output case, with the full decision tree.
Read the pageWhat remains possible after end-of-support, and where the real limits are.
Read the pageModel, configuration, symptoms and photographs in one submission.
Open the formOn picosecond systems the measurement method is as important as the number. Send the model and serial label photographs, your normal operating parameters, the symptoms, and the instrument and beam arrangement you used. We will tell you whether an evaluation is worth your shipping cost.
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