Independent evaluation and repair engineering for tunable parametric sources. A parametric module cannot produce more than its pump delivers, and it is sensitive to four separate pump properties at once. That is where the evaluation starts.
Optical parametric oscillators and amplifiers convert pump light into tunable signal and idler light. They are not sources in their own right. Everything they do is bounded by what the pump delivers, and unlike a simple frequency-doubling stage they are sensitive to four separate pump properties at once.
A parametric device depends on four pump properties at once: energy or average power, pulse duration, beam quality, and timing relative to the seed or the cavity. A drift in any one of them can collapse the output with nothing wrong inside the module.
Our evaluation covers the pump as its own subsystem, separately from the module, before any statement is made about the crystal, the cavity or the tuning hardware. That measurement is what separates a module fault from an upstream one, and it is done on our bench with the instrumentation named in the proposal.
This is a common reason an OPA turns out not to be the problem. The amplifier feeding it had lost pulse energy, or its compressor had drifted and lengthened the pump pulse, or its beam quality had degraded. In each case the parametric module was healthy and the repair belonged upstream.
The related case for simple harmonic stages is set out on the SHG and harmonic generation page. The principle is the same and the sensitivity here is higher.
The two get discussed together and they fail differently. Knowing which one you have changes the diagnostic order.
| OPO | OPA | |
|---|---|---|
| Architecture | A resonant cavity around the nonlinear crystal, oscillating from parametric gain | A single or multi-pass amplifier seeded by a white-light continuum or a separate seed |
| What can go wrong uniquely | Cavity alignment, cavity length and synchronization to the pump, cavity optic condition | Seed generation, seed and pump spatial and temporal overlap, delay-line position and stability |
| Typical failure signature | Will not oscillate, threshold has risen, output unstable or drops out at specific wavelengths | Output collapsed, gain low, tuning range narrowed, output present but unstable pulse to pulse |
| Sensitivity to pump timing | Cavity length must match the pump repetition rate in synchronously pumped designs | Delay between seed and pump must be correct to picosecond or better |
| Common cheap fix | Cavity length and alignment recovery | Delay-line and overlap recovery |
Many practical systems combine both, and multi-stage commercial modules frequently contain white-light generation, a preamplifier, a power amplifier and one or more harmonic stages in the same box.
Energy, pulse duration, beam quality or timing. The pump is a separate subsystem from the module it feeds, and a module can present as faulty when the pump is the subject. Both are inside the evaluation scope.
In OPA designs, the continuum generation stage. A degraded or damaged generation medium, or a drifted focus into it, removes the seed and therefore the output.
Spatial and temporal overlap, and the delay line that sets it. Mechanical, adjustable, and among the most recoverable faults on this list.
Crystal angle or temperature, and whether the correct condition can still be reached across the intended range. Recoverable by mapping rather than by replacement in many cases.
Stages that will not move, move without tracking readback, or have lost their home reference. Cheap to fix and a common cause of apparent tuning-range loss.
Surface and bulk damage, and coating degradation. Genuine, and less common than assumed.
Mirror condition, cavity length, and synchronization to the pump repetition rate.
Dichroics, filters and beam dumps that separate signal, idler and residual pump. A degraded separator removes the light you are trying to measure.
Crystal ovens, TEC loops, sensors and drivers in temperature-tuned designs.
Controllers, communication, calibration tables and the software that maps a requested wavelength onto hardware positions. A corrupted or lost calibration table presents as a tuning fault with healthy hardware.
Send the model, a photograph of the product label and the symptoms. We review it and respond with the next step.
We do not promise restoration of a tuning range we cannot verify against original acceptance data. Where that data exists we work to it. Where it does not, we document the range and output achieved on completion and compare it against the range the system produced on arrival. That is an honest record and it is the one your instrument file can actually use.
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 the platforms below. Configuration, parts access and required metrology decide the scope of a given job, and we confirm both with you before anything ships.
The legacy TOPAS generation is where most enquiries in this category sit. Background on that installed base is on the Light Conversion page.
Send us your configuration and we will confirm the scope. On parametric modules the crystal set, the stage hardware, the calibration path and the pump pairing matter more than the family name, and we settle both at the enquiry stage rather than after you have paid to crate the module.
Parametric modules are harder to evaluate in isolation than any other subsystem, because their behavior is defined by their pump. Wherever it is possible, send the pump with the module.
If the pump cannot be released, tell us at the enquiry stage. We will say whether a module-only evaluation answers your question, and where it does not we will tell you that instead of taking the shipment.
We receive systems from outside the United States, including from Canadian universities and research institutes. We provide the commercial documentation a repair shipment normally requires and coordinate with your shipping office. Customs classification, duties, temporary import treatment and clearance timing remain the sender's responsibility, and we do not give customs guarantees. We document the as-received condition on arrival, which is the evidence you would need if transit damage has occurred.
Not from that symptom alone. A parametric device cannot produce more than the pump delivers, and its output depends on pump energy, pump pulse duration, pump beam quality and pump timing, so a pump that has drifted in any of those respects will collapse OPA output with nothing wrong inside the module. The pump, the pump amplifier chain and the parametric module are all inside the evaluation scope, and the written findings state which of them the fault sits in before any repair is quoted.
More than one thing can, which is why the symptom alone does not settle it. The phase-matching condition may no longer be held across the full range, through crystal angle or temperature control, a motorised tuning stage that no longer tracks its readback, or degraded optics at the band edges. It can also originate upstream in a narrowed pump bandwidth, which is a different repair. The module and the pump chain feeding it are both in scope, and the findings say which.
We service the TOPAS and ORPHEUS families, and the legacy TOPAS generation is a generation that is no longer a current product. Contact us to confirm your specific configuration first. We are not an authorized Light Conversion service center and we hold no affiliation with the manufacturer.
Frequently yes, and that work is inside our scope on TOPAS, ORPHEUS and comparable parametric modules. Where a module was aligned at manufacture in a way that opening the housing destroys, and where no realignment path exists without factory tooling, we say so in writing before opening it rather than after. The written scope states which case applies to your module and what the residual risk is.
We are direct about the work we take on, so we are equally direct about the two boundaries.
If your system is still inside its manufacturer warranty, use the manufacturer, or get written authorization from the seller first. Our work is out-of-warranty and legacy equipment, which is where the support gap sits in any case.
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, not affiliated with or authorized by any manufacturer named on this page unless expressly stated in writing. Brand and model names identify equipment only.
Pump energy, pulse duration and beam condition at the module input decide whether the problem is in the parametric module at all. Send whatever numbers you already have and describe how they were taken. If you do not have them, say so, and we will work out what is needed at the enquiry stage.
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