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Laser Diodes

Laser diodes are semiconductor devices that emit highly focused, coherent light for industrial, medical, defence and scientific applications. Browse a wide selection of in-stock single-mode and high-power multi-mode laser diodes from leading manufacturers such as
OSRAM, USHIO, II-VI, and Mitsubishi.

Filter by wavelength, output power, and package type to find the right laser diode for your application.

Contact us for more information about our services, including laser diode characterization, sorting, and custom laser diode module design.

OSRAM Laser Diodes | USHIO Laser Diodes | II-VI Laser Diodes | World Star Tech Laser Diodes

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Part Wavelength Laser Power Package Brand  
BMU9-10A-9XX-01-02-R 915, 940, 960, 976 nm 10 W 2 Pin II-VI Laser Diodes View Detail
BMU30-9XX-01-R 905, 930, 975, 980 nm 30 W 2 Pin II-VI Laser Diodes View Detail
BMU40-9xx-02-R 915, 940, 960, 975 40 W 2 pin II-VI Laser Diodes View Detail
CM96Z*** - 7* 974, 978. 980 nm 600 mW 10 Pin Butterfly II-VI Laser Diodes View Detail
CM97 - xxx - 7x 980 nm 1 W 10 Pin Butterfly II-VI Laser Diodes View Detail
CM97A1064NFBG 1064 nm 1.5 W 10 Pin Butterfly II-VI Laser Diodes View Detail
CMDFB10xxA 1030, 1064 nm 800 mW 10 Pin Butterfly II-VI Laser Diodes View Detail
LU96Z***-7* 974, 976 nm 300 mW 8 Pin Butterfly II-VI Laser Diodes View Detail
WLD-15-785-PM-FC-APC 785 nm 15 mW Pigtailed Laser Diodes View Detail
WLD-30-633-PM-FC_APC 633 nm 30 mW Single Mode 8 mm package Pigtailed Laser Diodes View Detail
WLD-15-785-SM-FC-APC 785 nm 15 mW Pigtailed Laser Diodes View Detail
WLD-60-660-PM-FC-APC 659 nm 60 mW Pigtailed Laser Diodes View Detail
WLD-40-520-PM-FC-APC 520 nm 40 mW Pigtailed Laser Diodes View Detail
WLD-35-638-PM-FC-APC 638 nm 35 mW Pigtailed Laser Diodes View Detail
WLD-30-450-PM-FC-APC 450 nm 30 mW Pigtailed Laser Diodes View Detail
WLD-20-488-PM-FC-APC 488 nm 20 mW Pigtailed Laser Diodes View Detail
WLD-15-850-PM-FC-APC 852 nm 15 mW Pigtailed Laser Diodes View Detail
WLD-60-780-PM-FC-APC 785 nm 60 mW Pigtailed Laser Diodes View Detail
WLD-60-640-PM-FC-APC 639 nm 60 mW Pigtailed Laser Diodes View Detail
WLD-150-405 405 nm 150 mW 5.6 mm World Star Tech Diodes View Detail
WLD-30-505 505 nm 30 mW 5.6 mm World Star Tech Diodes View Detail
WLD-10-650N 650 nm 10 mW 5.6 mm World Star Tech Diodes View Detail
WLD-100-685 685 nm 100 mW 5.6 mm World Star Tech Diodes View Detail
WLD-100-785 785 nm 100 mW 5.6 mm World Star Tech Diodes View Detail
WLD-200-905 905 nm 200 mW 5.6 mm World Star Tech Diodes View Detail
WLD-200-940 940 nm 200 mW 5.6 mm World Star Tech Diodes View Detail
WLD-10-905 905 nm 10 mW 5.6 mm World Star Tech Diodes View Detail
HL40093MG 404 nm 500 mW 5.6 mm Ushio Laser Diodes View Detail
HL40033G 405 nm 1000 mW 9 mm Ushio Laser Diodes View Detail
HL40071MG 405 nm 300 mW 5.6 mm Ushio Laser Diodes View Detail
HL40041MG 405 nm 150 mW 5.6 mm Ushio Laser Diodes View Detail
HL40163MG 405 nm 175 mW 5.6 mm Ushio Laser Diodes View Detail
HL40063MG 405 nm 600 mW 5.6 mm Ushio Laser Diodes View Detail
HL40053MG 405 nm 500 mW 5.6 mm Ushio Laser Diodes View Detail
HL40161MG 405 nm 175 mW 5.6 mm Ushio Laser Diodes View Detail
HL40065MG 405 nm 600 mW 5.6 mm Ushio Laser Diodes View Detail
HL40115MG 405 nm 600 mW 5.6 mm Ushio Laser Diodes View Detail
HL40113MG 405 nm 600 mW 5.6 mm Ushio Laser Diodes View Detail
HL40085G 405 nm 1000 mW 9.0 mm Ushio Laser Diodes View Detail
HL63163DG 633 nm 100 mW 5.6 mm Ushio Laser Diodes View Detail
HL6322G 635 nm 15 mW 9 mm Ushio Laser Diodes View Detail
HL6321G 635 nm 15 mW 9 mm Ushio Laser Diodes View Detail
HL6320G 635 nm 10 mW 9 mm Ushio Laser Diodes View Detail
HL6319G 635 nm 10 mW 9 mm Ushio Laser Diodes View Detail
HL63283HD 636 nm 1200 mW 9 mm Ushio Laser Diodes View Detail
HL6388MG 637 nm 250 mW 5.6 mm Ushio Laser Diodes View Detail
HL63133DG 637 nm 170 mW 5.6 mm Ushio Laser Diodes View Detail
HL63142DG 637 nm 120 mW 5.6 mm Ushio Laser Diodes View Detail
HL63101MG 637 nm 5 mW 5.6 mm Ushio Laser Diodes View Detail
HL63102MG 637 nm 5 mW 5.6 mm Ushio Laser Diodes View Detail
PLT3 450GB 450 nm 100 mW 3.8mm Osram Laser Diodes View Detail
PLPT5 447KA 447 nm 1.6 W 5.6 mm Osram Laser Diodes View Detail
PLPT5 450KA 447 nm 2.2 W 5.6 mm Osram Laser Diodes View Detail
PLPT9 450LB_E 447 nm 5 W 9 mm Osram Laser Diodes View Detail
PLPCOS 450D 450 nm 5 W 1X1.2 mm Osram Laser Diodes View Detail
PLT5 488 488 nm 60 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 488 C1C6 488 nm 60 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 510 520 nm 10 mW 5.6 mm Osram Laser Diodes View Detail
PLT3 510 520 nm 10 mW 3.8 mm Osram Laser Diodes View Detail
PLT5 520EA_P 520 nm 20 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 520EB_P 520 nm 20 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 518FB_P 520 nm 30 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 522FA_P 514 nm 50 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 520 FB_P 520 nm 50 mW 5.6 mm Osram Laser Diodes View Detail
PL 520_B1 520 nm 50 mW 3.8 mm Osram Laser Diodes View Detail
PLT5 520_B1-3 520 nm 50 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 520B 520 nm 110 mW 5.6 mm Osram Laser Diodes View Detail
PLT3 520D 520 nm 100 mW 3.8 mm Osram Laser Diodes View Detail
PLT5 450GB 450 nm 100 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 520DB_P 515 nm 10 mW 5.6 mm Osram Laser Diodes View Detail
PLTB 450B 450 nm 1.6 W 5.6 mm Osram Laser Diodes View Detail
PLPM4_450 446 nm 50 W 5.6 mm Osram Laser Diodes View Detail
PLPT9 450LC_E 455 nm 5.5 W 9 mm Osram Laser Diodes View Detail
PLT5 488HB_EP 488 nm 300 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 488HB_EP-C2C5 488 nm 300 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 520HB_P 520 nm 130 mW 5.6 mm Osram Laser Diodes View Detail
PLPT9 450LB_E A01 447 nm 3.5 W 9 mm Osram Laser Diodes View Detail
PLT3 520FB 520 nm 50 mW 3.8 mm Osram Laser Diodes View Detail
PLT5 520EB_Q 520 nm 20 mW 5.6 mm Osram Laser Diodes View Detail
PLT5 514 514 +/-1 nm 50 mW 5.6 mm Laser Diodes-Measured View Detail
PLT 516 516+/-1 50 mW 5.6 mm Laser Diodes-Measured View Detail
HL63163DG 633 +/-1 nm 100 mW 5.6 mm Laser Diodes-Measured View Detail
HL63703HD 630 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL85022MG 850 nm 260 mW 5.6 mm USHIO LASER DIODES View Detail
HL65293HD 652 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL85023MG 850 nm 260 mW 5.6 mm USHIO LASER DIODES View Detail
HL63623HD 638 nm 1.6 W 9 mm USHIO LASER DIODES View Detail
HL78002MG 785 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL70041DG 698 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL70031DG 705 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL40211MG 405 nm 400 mW 5.6 mm USHIO LASER DIODES View Detail
HL40213MG 405 nm 400 mW 5.6 mm USHIO LASER DIODES View Detail
HL63680HD 638 nm 3 W 9 mm USHIO LASER DIODES View Detail
HL40175MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL69021DG 689 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL40173MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL67231DG 671 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL65263MG 658 nm 85 mW 5.6 mm USHIO LASER DIODES View Detail
HL67221DG 680 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL63723DG 642 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL40162MG 405 nm 175 mW 5.6mm USHIO LASER DIODES View Detail
HL63713HD 635 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL67213HD 683 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL67011DG 671 nm 210 mW 5.6 mm USHIO LASER DIODES View Detail
HL65312MG 662 nm 12 mW 5.6 mm USHIO LASER DIODES View Detail
HL65311MG 662 nm 12 mW 5.6 mm USHIO LASER DIODES View Detail
PLT5 450GB 450 nm 100 mW 5.6 mm USHIO LASER DIODES View Detail
PLT5 514 514 +/-1 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
PLT 516 516+/-1 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL70021DG 700 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL65303HD 665 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL85021MG 850 nm 250 mW 5.6 mm USHIO LASER DIODES View Detail
HL40041MG 405 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL63163DG 633 nm 100 mW 5.6 mm USHIO LASER DIODES View Detail
HL40161MG 405 nm 175 mW 5.6 mm USHIO LASER DIODES View Detail
HL40163MG 405 nm 175 mW 5.6 mm USHIO LASER DIODES View Detail
HL40071MG 405 nm 300 mW 5.6 mm USHIO LASER DIODES View Detail
HL40053MG 405 nm 500 mW 5.6 mm USHIO LASER DIODES View Detail
HL40093MG 404 nm 500 mW 5.6 mm USHIO LASER DIODES View Detail
HL40063MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL40065MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL40113MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL40115MG 405 nm 600 mW 5.6 mm USHIO LASER DIODES View Detail
HL40033G 405 nm 1 W 9 mm USHIO LASER DIODES View Detail
HL40085G 405 nm 1 W 9 mm USHIO LASER DIODES View Detail
HL63101MG 635 nm 5 mW 5.6 mm USHIO LASER DIODES View Detail
HL63102MG 637 nm 5 mW 5.6 mm USHIO LASER DIODES View Detail
HL6312G-A 638 nm 5 mW 9.0 mm USHIO LASER DIODES View Detail
HL63133DG 637 nm 170 mW 5.6 mm USHIO LASER DIODES View Detail
HL63142DG 637 nm 120 mW 5.6 mm USHIO LASER DIODES View Detail
HL63153AT 638 nm 150 mW 3.8 mm USHIO LASER DIODES View Detail
HL63192DG 638 nm 700 mW 5.6 mm USHIO LASER DIODES View Detail
HL63193MG 638 nm 700 mW 5.6 mm USHIO LASER DIODES View Detail
HL6319G-A 635 nm 10 mW 9 mm USHIO LASER DIODES View Detail
HL6320G-A 635 nm 10 mW 9 mm USHIO LASER DIODES View Detail
HL6321G-A 635 nm 15 mW 9 mm USHIO LASER DIODES View Detail
HL6322G-A 635 nm 15 mW 9 mm USHIO LASER DIODES View Detail
HL6323MG-A 639 nm 30 mW 5.6 mm USHIO LASER DIODES View Detail
HL63253MG 638 nm 450 mW 5.6 mm USHIO LASER DIODES View Detail
HL63263DG 638 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL63283HD 636 nm 1.2 W 9 mm USHIO LASER DIODES View Detail
HL63290HD 638 nm 2 W 9 mm USHIO LASER DIODES View Detail
HL63373HD 638 nm 1 W 9 mm USHIO LASER DIODES View Detail
HL63391DG 638 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL63392DG 639 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL63520HD 638 nm 2.4 W 9 mm USHIO LASER DIODES View Detail
HL6354MG 638 nm 7 mW 5.6 mm USHIO LASER DIODES View Detail
HL6355MG 638 nm 5 mW 5.6 mm USHIO LASER DIODES View Detail
HL6358MG-A 639 nm 12 mW 5.6 mm USHIO LASER DIODES View Detail
HL6359MG 639 nm 12 mW 5.6 mm USHIO LASER DIODES View Detail
HL6360MG-A 639 nm 25 mW 5.6 mm USHIO LASER DIODES View Detail
HL6361MG-A 639 nm 25 mW 5.6 mm USHIO LASER DIODES View Detail
HL6362MG-A 640 nm 45 mW 5.6 mm USHIO LASER DIODES View Detail
HL6363MG-A 640 nm 45 mW 5.6 mm USHIO LASER DIODES View Detail
HL63641DG 639 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL63642DG 639 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL63643DG 639 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL6364DG-A 642 nm 65 mW 5.6 mm USHIO LASER DIODES View Detail
HL63653TG 640 nm 200 mW 3.8 mm USHIO LASER DIODES View Detail
HL6366DG-A 643 nm 90 mW 5.6 mm USHIO LASER DIODES View Detail
HL6367DG-A 643 nm 90 mW 5.6 mm USHIO LASER DIODES View Detail
HL6385DG-A 642 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL6388MG 637 nm 250 mW 5.6 mm USHIO LASER DIODES View Detail
HL6395MG-A 639 nm 10 mW 5.6 mm USHIO LASER DIODES View Detail
HL6396MG 639 nm 10 mW 5.6 mm USHIO LASER DIODES View Detail
HL6397MG-A 639 nm 25 mW 5.6 mm USHIO LASER DIODES View Detail
HL6398MG 639 nm 25 mW 5.6 mm USHIO LASER DIODES View Detail
HL65014DG 648 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL6501MG-A 658 nm 35 mW 5.6 mm USHIO LASER DIODES View Detail
HL65051DG 660 nm 120 mW 5.6 mm USHIO LASER DIODES View Detail
HL65055DG 660 nm 120 mW 5.6 mm USHIO LASER DIODES View Detail
HL65213HD 659 nm 1.2 W 9 mm USHIO LASER DIODES View Detail
HL65221DG 660 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL65222DG 660 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL65223DG 660 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL65231DG 660 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL65232DG 660 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL65233DG 660 nm 150 mW 5.6 mm USHIO LASER DIODES View Detail
HL65241DG 660 nm 100 mW 5.6 mm USHIO LASER DIODES View Detail
HL65242DG 660 nm 100 mW 5.6 mm USHIO LASER DIODES View Detail
HL65243DG 660 nm 100 mW 5.6 mm USHIO LASER DIODES View Detail
HL65261MG 658 nm 80 mW 5.6 mm USHIO LASER DIODES View Detail
HL8341MG-A 852 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL65262MG 658 nm 80 mW 5.6 mm USHIO LASER DIODES View Detail
HL65264MG 658 nm 80 mW 5.6 mm USHIO LASER DIODES View Detail
HL6544FM-A 660 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL6545MG-A 660 nm 130 mW 5.6 mm USHIO LASER DIODES View Detail
HL67001DG 675 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL6714G-A 670 nm 10 mW 9 mm USHIO LASER DIODES View Detail
HL67191MG 670 nm 15 mW 5.6 mm USHIO LASER DIODES View Detail
HL67192MG 670 nm 15 mW 5.6 mm USHIO LASER DIODES View Detail
HL67203HD 675 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL6738MG-A 690 nm 30 mW 5.6 mm USHIO LASER DIODES View Detail
HL6748MG-A 670 nm 10 mW 5.6 mm USHIO LASER DIODES View Detail
HL6750MG-A 685 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL6756MG-A 670 nm 15 mW 5.6 mm USHIO LASER DIODES View Detail
HL69001DG 690 nm 200 mW 5.6 mm USHIO LASER DIODES View Detail
HL69203HD 690 nm 1.3 W 9 mm USHIO LASER DIODES View Detail
HL7001MG-A 705 nm 40 mW 5.6 mm USHIO LASER DIODES View Detail
HL7002MG-A 705 nm 40 mW 5.6 mm USHIO LASER DIODES View Detail
HL7301MG-A 730 nm 40 mW 5.6 mm USHIO LASER DIODES View Detail
HL7302MG-A 730 nm 40 mW 5.6 mm USHIO LASER DIODES View Detail
HL83013MG 830 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL8337MG-A 830 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL8338MG-A 830 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail
HL8340MG-A 852 nm 50 mW 5.6 mm USHIO LASER DIODES View Detail


What Is a Laser Diode?


A laser diode is a semiconductor device that emits light through stimulated emission, producing a highly focused and coherent beam. Unlike LEDs, which emit light in many directions, laser diodes generate a narrow, directional beam, making them ideal for precision applications such as optical communication, sensing, measurement, excitation, and material processing.

Laser diodes are widely used due to their high efficiency, compact size, and ability to operate at specific wavelengths, ranging from ultraviolet to infrared.


How Do Laser Diodes Work?


Laser diodes work by passing an electrical current through a semiconductor junction, where electrons and holes recombine and release energy in the form of photons. These photons are amplified within an optical cavity formed by reflective surfaces, producing a coherent and highly directional beam of light.

The wavelength of a laser diode is determined by the semiconductor materials and structure used, allowing devices to be engineered for specific wavelengths and applications.


Types of Laser Diodes


There are several types of laser diodes, each designed for specific performance requirements and applications:


Each type of laser diode offers specific advantages depending on factors such as wavelength stability, output power, and application requirements.


Applications of Laser Diodes


Laser diodes are used in a wide range of industries and technologies, including:


Their efficiency, compact size, and precise light output make laser diodes essential components in modern technology.


How to Choose a Laser Diode?


Selecting the right laser diode depends on several important technical factors:


Understanding these parameters helps ensure optimal performance and reliability for your specific application.


Why Choose World Star Tech for Laser Diodes?


World Star Tech provides high-quality laser diodes and laser diode modules designed for reliability, stability, and precision. With a wide selection of wavelengths and output power levels, we support applications in research, industrial manufacturing, medical technology, and defense.

Our team offers expert guidance to help you select the right laser diode for your specific application, ensuring optimal performance and integration.

Laser Diode Frequently Asked Questions

What is a laser diode?
A laser diode is a semiconductor device that produces coherent laser light when electrical current is applied. Laser diodes are compact, efficient, and available in many wavelengths, making them suitable for medical, industrial, scientific, sensing, and illumination applications.

What is the difference between an LED and a laser diode?
Laser diodes emit coherent, highly directional light, while LEDs produce incoherent light that spreads over a wider angle.

What are laser diodes used for?
Laser diodes are used in fiber optic communication, medical devices, industrial processing, sensing systems, and scientific instrumentation.

How long do laser diodes last?
The lifetime of a laser diode typically ranges from several thousand to over 20,000 hours, depending on operating conditions such as temperature, current, and usage.

What wavelength laser diode should I choose?
The correct laser diode wavelength depends on your application, as different wavelengths interact differently with materials and sensors. Common uses include alignment, detection, biomedical, machine vision, imaging and material processing.

What wavelengths are laser diodes available in?
Laser diodes are available in many wavelengths, including UV, violet, blue, cyan, green, red, near-infrared, and infrared. Common wavelengths include 375 nm, 405 nm, 450 nm, 488 nm, 520 nm, 635 nm, 642 nm, 650 nm, 660 nm, 808 nm, 905 nm, 980 nm, 1064 nm, and 1550 nm.

What is a 488 nm laser diode used for?
A 488 nm laser diode is commonly used for flow cytometry, fluorescence excitation, medical diagnostics, DNA sequencing, bio-fluorescence, microscopy, and scientific instrumentation. It is often selected as a compact and efficient alternative to larger argon-ion laser systems.

Laser Diode Parameter Questions

What are the most important laser diode parameters?
Important laser diode parameters include wavelength, output power, threshold current, operating current, operating voltage, beam divergence, beam quality, package type, slope efficiency, spectral width, polarization, operating temperature, and lifetime.

What does laser diode wavelength mean?
Wavelength defines the color or spectral output of the laser diode. It is usually measured in nanometers, such as 405 nm, 488 nm, 520 nm, 635 nm, 808 nm, or 980 nm. The correct wavelength depends on the material interaction, reflection, absorption, sensor, excitation dye, or application being used.

What is optical output power?
Optical output power is the amount of laser light produced by the diode. It is usually measured in milliwatts or watts. Low-power laser diodes are often used for sensing, alignment, fluorescence, and measurement, while higher-power laser diodes are used for illumination, pumping, engraving, and industrial applications.

What is threshold current?
Threshold current is the minimum current required for the laser diode to begin lasing. Below this current, the diode behaves more like an LED. Above the threshold current, the diode produces coherent laser light.

What is operating current?
Operating current is the recommended current used to drive the laser diode at its rated output power. A stable current-controlled laser diode driver is required to protect the diode and maintain consistent performance.

What is forward voltage?
Forward voltage is the voltage across the laser diode when it is operating. It depends on the diode material, wavelength, and operating current. Both current and voltage ratings should be considered when selecting a driver.

What is beam divergence?
Beam divergence describes how quickly the laser beam spreads as it travels. Lower divergence is usually preferred for collimation, fiber coupling, long-distance sensing, and precision optical systems.

What is spectral width?
Spectral width describes how narrow or broad the laser diode emission wavelength is. A narrow spectral width is important for spectroscopy, sensing, fluorescence, and applications requiring precise wavelength control.

What is a monitor photodiode?
A monitor photodiode is a built-in detector that measures part of the laser diode output. It can be used in automatic power control systems to help maintain stable optical output power.

What is slope efficiency?
Slope efficiency describes how efficiently electrical current is converted into optical output power after the laser reaches threshold. Higher slope efficiency generally means better electrical-to-optical performance.

Why is temperature control important for laser diodes?
Temperature affects laser diode wavelength, output power, efficiency, and lifetime. For stable performance, many laser diodes require proper heat sinking or TEC temperature control.

Laser Diode Selection Questions

How do I choose the right laser diode?
The best laser diode depends on wavelength, output power, beam quality, package type, fiber coupling requirements, operating temperature, lifetime, and application. The diode should also be matched with the correct driver, optics, and thermal design.

What is the difference between single-mode and multimode laser diodes?
A single-mode laser diode produces a smaller and cleaner beam with better beam quality. It is preferred for fiber coupling, fluorescence, microscopy, and precision optical systems. A multimode laser diode usually provides higher output power but has a larger beam and lower beam quality.

What package types are available?
Laser diodes are available in TO-can packages such as 3.8 mm, 5.6 mm and 9 mm, butterfly packages, C-mounts, chip-on-submount packages, and fiber-coupled modules. The best package depends on power, cooling, optical alignment, and integration requirements.

Do laser diodes require a driver?
Yes. Laser diodes require a proper current-controlled laser diode driver. They should not be connected directly to a standard power supply because current spikes can permanently damage the laser diode.

Do laser diodes need cooling?
Some low-power laser diodes can operate with simple heat sinking, while higher-power or precision laser diodes may require TEC cooling. Proper thermal management helps maintain stable output power, wavelength, and lifetime.

Laser Diode Application Questions

What are laser diodes used for?
Laser diodes are used in medical diagnostics, flow cytometry, DNA sequencing, fluorescence excitation, microscopy, spectroscopy, LiDAR, laser alignment, barcode scanning, optical sensing, machine vision, industrial equipment, and fiber-optic communication.

Which laser diode is used for fluorescence excitation?
Fluorescence applications often use wavelengths such as 405 nm, 445 nm, 488 nm, 520 nm, 635 nm, 642 nm, 660 nm and 685 nm depending on the fluorescent dye or marker. A 488 nm laser diode is especially common for bio-fluorescence and flow cytometry.

Which laser diode is used for flow cytometry?
Flow cytometry systems commonly use laser diodes at 405 nm, 488 nm, 520 nm, 561 nm, 635 nm, and 640 nm.
The correct wavelength depends on the fluorophores used in the system.

Can laser diodes be used for medical diagnostics?
Yes. Laser diodes are widely used in medical diagnostics, including fluorescence analysis, imaging, biosensing, blood analysis, DNA sequencing, and laboratory instruments.

Can laser diodes be used for LiDAR?
Yes. Infrared laser diodes, such as 905 nm and 1550 nm, are commonly used in LiDAR and time-of-flight sensing applications. The wavelength and power depend on the range, safety requirements, and detector technology.

Can laser diodes be used for engraving or marking?
Yes, higher-power laser diodes can be used for engraving, marking, and material processing. The suitability depends on wavelength, optical power, beam quality, focusing optics, and the material being processed.

Can laser diodes be fiber coupled?
Yes. Many laser diodes can be coupled into optical fiber. Single-mode laser diodes are usually preferred for single-mode fiber coupling, while multimode laser diodes are commonly used with multimode fiber for higher-power applications.

What information is needed to request a laser diode quote?
To request a quote, it is helpful to provide the wavelength, output power, package type, quantity, application, beam requirements, fiber coupling needs, operating temperature, and any special requirements such as TEC cooling, monitor photodiode, or driver electronics.

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