How to Select a Laser for LiDAR: Wavelength, Pulse Width, Power, and Linewidth

If you are choosing a laser for LiDAR, the fastest way to make a bad decision is to start with a wavelength and stop there. A workable LiDAR source has to match the measurement method, detector strategy, optical power budget, safety target, packaging constraints, and the type of signal processing the system uses.

In practice, most teams are not asking one generic question. They are usually asking one of these:

• Do we need a pulsed source for time-of-flight or laser ranging?

• Do we need a longer pulse or quasi-CW source for a specific ranging architecture?

• Do we need a narrow-linewidth source for coherent or FMCW-style detection?

• Do we need a lab source first, or a module that can move into OEM integration?

That is why wavelength, pulse width, power, and linewidth should be reviewed together. OmniWavelength's current catalog is especially relevant in two LiDAR-related directions: a 1064 nm nanosecond pulsed fiber laser for pulsed ranging and a group of 1550 nm fiber-coupled, quasi-CW, high-power, and single-frequency options that are more relevant when eye-safety margin, telecom-band integration, or coherence become part of the design.

Start with the LiDAR architecture, not the laser part number

Before comparing products, define which LiDAR architecture you are actually building.

This distinction matters because a good pulsed LiDAR laser is not automatically a good coherent LiDAR laser. A source optimized for nanosecond peak power can be the wrong tool if the receiver depends on narrow linewidth and phase stability. The reverse is also true: a narrow-linewidth source may be excellent for coherent detection but the wrong value proposition for a basic pulsed ranging system.

Wavelength selection: why 1064 nm and 1550 nm lead to different system trade-offs

The wavelength decision changes the detector stack, the eye-safety strategy, the component ecosystem, and often the packaging cost.

When 1064 nm is usually the practical fit

On OmniWavelength's current LiDAR-relevant catalog, the clearest published pulsed option is the 1064 nm Nanosecond Fiber Laser. The live catalog describes it as a nanosecond pulsed fiber laser with:

• 1064 nm wavelength

• pulse width tunable from 3 ns to 50 ns

• repetition rate tunable from 1 kHz to 3000 kHz

• peak power options from 10 W to 50 W

• SM or PM fiber options

• module or benchtop packaging

That profile is a strong match when the system is built around pulsed ranging, timing resolution, and fiber-delivered integration.

In practical terms, 1064 nm often makes sense when:

• you want a pulsed architecture instead of a coherent one

• you need nanosecond-class timing rather than ultra-narrow linewidth

• you want a mature pulsed-laser path for ranging, measurement, or nonlinear-optics-adjacent work

• you are comparing integration convenience and pulse configurability more than telecom-band compatibility

The main caution is eye-safety margin. Many teams choose 1550 nm specifically because it gives them more room at the system level. If the optical power target is aggressive and the emitted beam may be exposed to open-space use, the wavelength decision should be reviewed together with the final safety classification, optics, scan pattern, and aperture conditions.

When 1550 nm becomes the better direction

OmniWavelength's current catalog shows several 1550 nm-family options that point to a different design path:

• 1550/1565 nm Wavelength Quasi-CW Fiber Laser (Long Pulses Laser) with published 1 W starting power and SM fiber output

• 1550 nm / 1570 nm / 1590 nm Wavelength High Power SM Fiber Coupled Laser with published 1 W starting power

• Single Frequency Laser category for applications where coherence and narrow linewidth matter more than broadband pulsed behavior

That matters because 1550 nm is not just "another wavelength." It often signals a different system strategy:

• more attention to eye-safety headroom

• stronger relevance to telecom-band fiber components

• higher likelihood that linewidth and coherence will matter

• more interest in fiber-coupled, narrow-linewidth, or seed-style configurations rather than simple pulsed ablation-style sources

The trade-off is usually system cost and complexity. The source, detector chain, and optical budget assumptions often become less forgiving than in a simpler pulsed design.

Pulse width: this is the parameter that decides whether range resolution or energy delivery wins

For pulsed LiDAR, pulse width is one of the first parameters to lock.

Shorter pulses usually help when:

• you want cleaner time-of-flight separation

• you care about range resolution

• you need better target separation in cluttered scenes

• you want high peak power without stretching energy across a long window

Longer pulses or quasi-CW operation become more attractive when:

• the architecture is not centered on short-pulse timing resolution

• the system needs longer energy delivery windows

• the driver and thermal design favor longer-pulse operation

• you are closer to a coherent or special ranging design than a classic pulsed ToF design

Using OmniWavelength's currently visible products as examples:

One procurement mistake is comparing a nanosecond pulsed source with a quasi-CW source as if the choice were only about wavelength. It is usually a choice between architectures.

Power: compare the right kind of power

LiDAR buyers often say "power" when they mean three different things:

• peak power

• average power

• power at the receiver after optical and atmospheric losses

These are not interchangeable.

For pulsed LiDAR, peak power often matters more than headline average power because the return signal depends on what happens during the short transmit window. A source with modest average power can still be very effective if the pulse energy and peak power are appropriate for the ranging problem.

For longer-pulse, quasi-CW, or coherent architectures, average power stability and power control may matter more than pulse peak.

That is why OmniWavelength's currently visible 1064 nm nanosecond page and 1550 nm fiber-coupled pages should not be compared using one simplified "watts" column:

• the 1064 nm nanosecond page is published in terms of pulse width, rep rate, and peak power

• the 1550 quasi-CW and 1550 high-power SM fiber-coupled pages are more relevant to continuous or long-pulse output headroom

If your team does not separate peak power from average power in the RFQ, the quote comparison can become misleading very quickly.

Linewidth: critical for coherent LiDAR, secondary for basic pulsed ranging

Linewidth is one of the most misunderstood LiDAR parameters because its importance depends heavily on the architecture.

When linewidth is not the main buying priority

For straightforward pulsed time-of-flight or ranging systems, linewidth is usually not the first decision variable. Pulse timing, peak power, repetition rate, trigger behavior, and packaging are often more important.

That is why a pulsed 1064 nm nanosecond source can be the right answer even if the system team has not yet defined a narrow-linewidth target.

When linewidth becomes a hard requirement

For coherent or FMCW-style LiDAR, linewidth is no longer a secondary detail. It affects:

• coherence length

• beat-note quality

• velocity extraction

• phase stability

• frequency sweep usefulness in architectures that rely on coherent processing

In those cases, the safer path is to start from OmniWavelength's Single Frequency Laser category or from a narrow-linewidth fiber-coupled configuration discussion, not from a general pulsed laser page.

This is also where buyers should stop using vague language like "stable laser" and define the real requirement:

• maximum acceptable linewidth

• wavelength accuracy or tuning window

• phase-noise sensitivity

• required warm-up and drift behavior

• whether the source must support fiber coupling, PM output, or OEM packaging

If the system is coherent, the most expensive mistake is under-specifying linewidth early and discovering later that the return processing margin is gone.

A practical selection framework

If you need to narrow the choice quickly, use this sequence.

1. Decide whether the system is pulsed or coherent

• Choose the 1064 nm nanosecond path first if the system is clearly pulsed ToF or laser ranging and the main problem is pulse generation.

• Choose the 1550 single-frequency or narrow-linewidth path first if the system depends on coherent mixing, phase stability, or FMCW behavior.

• Use the 1550 quasi-CW or high-power fiber-coupled path if the design needs 1550-family output but is not yet locked to a single-frequency coherent architecture.

2. Lock the pulse behavior before discussing wavelength in isolation

For pulsed systems, define:

• pulse width target

• repetition-rate range

• trigger mode

• minimum pulse energy or peak power requirement

For coherent systems, define:

• linewidth target

• frequency stability requirement

• wavelength window

• PM versus SM output requirement

3. Match power to the actual optical budget

Do not ask for "the highest available power." Ask for the power that closes the link budget after:

• scan loss

• optics transmission loss

• atmospheric path loss

• target reflectivity

• receiver sensitivity margin

Over-specifying power raises cost, thermal load, and sometimes safety burden without improving the real ranging outcome.

4. Decide early whether the output must be SM or PM fiber

OmniWavelength's LiDAR-relevant products already show that fiber format is part of the decision, not a late accessory choice.

• SM is usually enough for many source-delivery paths

• PM becomes more important when polarization control or coherent system behavior matters

5. Pick the package around the project stage

The current product pages and category pages repeatedly separate module and benchtop forms.

• choose benchtop if the immediate goal is lab validation and fast setup

• choose module if the source is expected to move into OEM integration, space-constrained packaging, or custom system assembly

What buyers should confirm before asking for a quote

Before sending a LiDAR RFQ, confirm these points internally:

1. Is the system pulsed ToF, long-pulse ranging, or coherent/FMCW?

2. What wavelength family is actually preferred after eye-safety, detector, and integration trade-offs are reviewed?

3. Do we need nanosecond pulses, quasi-CW output, or narrow-linewidth single-frequency behavior?

4. Are we optimizing for peak power, average power, or coherence performance?

5. Do we need SM or PM fiber output?

6. Do we need a benchtop unit for evaluation or a module for OEM integration?

7. What control signals matter: internal trigger, external trigger, RS232, or another interface?

8. What thermal or long-run stability must the source meet over the intended duty cycle?

These questions sound basic, but they are exactly what separates a usable quote request from a vague one.

Which OmniWavelength product direction fits each LiDAR question

Conclusion

The right LiDAR laser is not chosen by wavelength alone. Start with the architecture, then lock the pulse behavior or linewidth requirement, then match the power format, fiber interface, and package style to the actual system stage.

Based on OmniWavelength's current catalog, the clearest pulsed LiDAR path starts with the 1064 nm nanosecond fiber laser, while 1550 nm decisions should usually branch into quasi-CW, high-power fiber-coupled, or single-frequency evaluation depending on whether the real driver is eye-safety margin, output headroom, or coherence. If you define those requirements up front, the quote process becomes much faster and far more accurate.

FAQs

1. Is 1550 nm always better than 1064 nm for LiDAR?

No. 1550 nm often gives more eye-safety room at the system level, but that does not automatically make it the better source choice. If your architecture is pulsed ranging and the real requirement is tunable nanosecond pulses with practical integration, a 1064 nm pulsed source can be the better fit.

2. For pulsed LiDAR, should I care more about pulse width or linewidth?

Usually pulse width. In a pulsed ToF system, pulse width, repetition rate, peak power, and trigger behavior are usually more important than narrow linewidth. Linewidth becomes much more important when the LiDAR architecture is coherent or FMCW-based.

3. Can I compare a nanosecond pulsed laser and a quasi-CW laser by wattage alone?

No. That comparison usually hides the real difference between peak power and average power. A pulsed source and a quasi-CW source solve different system problems, so the architecture has to be compared before the power numbers mean anything.

4. When should I start from a single-frequency laser instead of a pulsed laser page?

Start from a single-frequency or narrow-linewidth path when the LiDAR design depends on coherent detection, Doppler extraction, beat-note quality, or phase stability. In those systems, linewidth is not a secondary spec. It is one of the main selection constraints.

5. What should I send OmniWavelength before requesting a LiDAR quote?

Send the target wavelength, LiDAR architecture, pulse width or linewidth target, repetition-rate or frequency-stability requirement, power target, fiber type, package preference, control-interface needs, and application scenario. That gives the engineering team enough information to match a standard or custom configuration instead of replying with a generic option list.

For related selection work, see How to Choose the Right Wavelength and Power Band for a Fiber-Coupled Laser, Benchtop vs Module Laser Packaging: What Engineering Teams Should Decide Early, and What Procurement Teams Should Ask for Before Ordering a Specification-Heavy Laser System.