المعرفة

قاعدة المعرفة الهندسية

الفيزياء والمقايضات وأنماط الفشل وراء اختيار مصدر الليزر - مكتوبة لمن عليه أن يلتزم بتصميم.

دليل الاختيار

الاختيار بين خيارين يبدوان معقولين على صحيفة البيانات.

905 nm vs 1535 nm vs 1550 nm: choosing a wavelength for ranging and LiDAR

The wavelength decision sets your detector, your eye-safety class, your maximum usable energy and your weather performance. Here is how the three bands actually compare for ranging work.

5 دقائق قراءة2026-10-07 Selection guide

How to choose a 905 nm pulsed laser diode: from range target to part number

A repeatable procedure for turning a range requirement into pulse energy, pulse energy into peak power and pulse width, and peak power into the smallest package that survives your duty cycle.

6 دقائق قراءة2026-10-07 Selection guide

Peak power, pulse width and duty cycle: the three numbers that define a pulsed laser diode

Peak power sells the part, pulse width sets the resolution, and duty cycle decides whether it survives. Getting the relationship wrong is the most common way a pulsed laser design fails.

4 دقائق قراءة2026-10-07 Selection guide

VCSEL vs edge-emitting laser: choosing a source for 3D sensing and LiDAR

Edge emitters win on peak power and range, VCSELs win on beam shape, duty cycle and cost. The comparison that matters is not watts - it is pulse energy, and the two technologies reach it in completely different ways.

5 دقائق قراءة2026-10-07

الكواشف

جانب الاستقبال، حيث يُكسَب معظم هامش الوصلة أو يُفقَد.

Detectors

Choosing the receive side: avalanche photodiodes vs PIN photodiodes

Most of a ranging link's margin is recovered at the receiver, not the transmitter. Here is when an APD earns its 10x price, how gain and noise trade off, and what the specification numbers actually mean.

4 دقائق قراءة2026-10-07

البصريات

إيصال الحزمة من الشريحة إلى الهدف.

Optics

Fast-axis collimation and fibre coupling: getting the beam from the die to the target

An edge emitter's 25 degree fast axis wastes most of its energy on empty sky. Here is what a fast-axis collimator actually recovers, why it is a precondition for fibre coupling, and when you should not use one.

5 دقائق قراءة2026-10-07 Optics

Visible and RGB laser illumination: brightness, white balance and speckle

A visible source is not a 905 nm part with a shorter wavelength. The photopic curve decides which colour owns the power budget, etendue decides how bright the spot can be, speckle decides how uniform it looks - and the eye's aversion response changes the safety arithmetic, but less than most people assume.

9 دقائق قراءة2026-10-07

السلامة

ما تشترطه المعايير، وما تعنيه لميزانية طاقتك.

Safety

Laser safety classes for ranging products: how the eye-safety limit overrides your energy budget

The energy budget is an optical calculation; whether you are allowed to emit that energy is a regulatory one. Here is what determines the limit, why the component is never the product, and how to design so the limit does not force you to 1535 nm.

6 دقائق قراءة2026-10-07

الفيزياء

العلاقات التي تقيِّد كل تصميم لقياس المدى بالليزر.

Physics

The laser range equation: how much pulse energy does a ranging link actually need?

Before you choose a diode, work out the energy budget. This derives the range equation for an extended target, calibrates it against products with known real-world performance, and gives you a table you can design from.

5 دقائق قراءة2026-10-07

الإلكترونيات

تشغيل ثنائي ليزر دون إتلافه.

Electronics

Driving a 905 nm pulsed laser diode: current, edge rates and what actually kills diodes

A pulsed laser diode is only as good as the pulse it is given. Here is what the driver's rise time, loop inductance, compliance voltage and duty cycle do to pulse energy - and the failure modes that destroy diodes in the first week.

6 دقائق قراءة2026-10-07