Laser Diodes: IR, Red, Green, Blue laser diode

Laser Diode

A laser diode (or LD) is a laser light emitting semiconductor device using the properties of a p-n junction. As laser diodes play an important role in optoelectronic applications, Egismos is proud to provide an extensive selection of laser diodes that include Infrared (IR) laser diode, Red laser diode, Green laser diode, Blue laser diode with various wavelengths, packages, and output powers. Egismos range of laser diodes comprises: 405nm, 450nm, 635nm, 650nm, 670nm, 780nm, 808nm, 830nm, 850nm, 870nm, 905nm, 980nm, 1064nm, 1310nm, 1550nm laser diodes from 3mW to 5W C-mount laser diodes.

The Red spectrum range of light has wavelengths comprised between 625nm to 700nm. Egismos offers a wide range of Laser Diodes including but not limited to 635nm, 650nm, 660nm with output power from 5mW to 100mW. Red lasers are used for skin treatment, LLLT therapy & Tissue Rejuvenation, Laser Range Meters, Laser Pointing, Laser Sights, Dry-Fire Training for Civilians as well as Military & Police, Laser Levels, Bar Code Scanners. Red laser light also can be used as a supplementary light for indoor plant lighting during plant flowering stages.

635nm Laser Diode
635nm Red Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-5-635-5 635 5 5.6 50 N
D6-5-635-10 635 10 5.6 50 N
D6-5-635-20 635 20 5.6 50 N
D6-5-635-30 635 30 5.6 50 N
650nm Laser Diode
650nm Red laser diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-5-650-5-N 650 5 5.6 50 N
D6-5-650-5-P 650 5 5.6 50 P
D6-7-650-5-N 650 5 5.6 70 N
D6-7-650-5-P 650 5 5.6 70 P
D6-7-650-7-N 650 7 5.6 70 N
D6-7-650-7-P 650 7 5.6 70 P
D6-5-650-10 650 10 5.6 50 N
D6-5-650-30-N 650 30 5.6 50 N
D6-7-650-30-P 650 30 5.6 70 P
660nm Laser Diode
660nm Red laser diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-7-660-50-N 660 50 5.6 70 N
D6-7-660-100 660 100 5.6 70 P,no PD

During the last few years there was a shift from Green DPSS Lasers to direct-emitting diode lasers. Direct-emitting laser diodes are not only more efficient than DPSS, but also have faster modulation speeds, which is essential for such applications as Laser Projection.

The green laser light is the best perceived light by the human eye, thereby allowing applications with good visibility with limited power.

520nm Lasers are also being used for Laser Sights & Designators, Underwater Laser Communication Systems, Phototherapy, Retina Diseases, Tattoo Removal and more. Egismos provides 5.6mm and 9mm casing Laser Diodes with Output power varying from 10mW to 1W.

520nm Laser Diode
520nm Green laser diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-6-515-10 515 10 5.6 60 N
D6-6-520-30 520 30 5.6 60 N
D6-6-520-50 520 50 5.6 60 N
D6-6-520-60 520 60 5.6 60 N

Egismos offers 405nm and 450nm lasers with up to 5W output power. Blue lasers have a shorter wavelength which allows their beam to be focused into a very small area. Therefore, the most suitable applications are those that require high power density in a very small area: Laser Cutting, Laser Welding, Laser Printing, Lasers for Dermatology, Plastic Surgery and other medical applications. Single-mode and multi-mode Laser Diodes are available in 3.8mm, 5.6mm, and 9mm packages.

405nm Laser Diode
405nm blue laser diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-7-405-20 405 20 5.6 70 M
D6-7-405-40 405 40 5.6 70 M
D4-7-405-150 405 150 3.8 70 1+3-
D6-7-405-250 405 250 5.6 70 1+3-
450nm Laser Diode
450nm blue laser diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D4-7-450-50 450 50 3.8 70 1+3-
D4-7-450-80 450 80 3.8 70 1+3-
D4-7-450-100 450 100 3.8 70 1+3-
D4-3-450-200 450 200 3.8 30 1+3-

IR lasers are responsible for our lightning fast internet connection via optical fiber cables. The most common wavelength for fiber optics communications is 1064nm. Other IR wavelengths are used for laser cutting, welding, scanning, laser range finding, military target designation, spectroscopy, medical applications and more. IR light is also responsible for the revolution in Robotics and Machine Vision. Egismos provides a wide range of wavelengths in Near Infrared Spectrum for TOF (time of flight) applications, that can be used from self-driving cars & drones to androids and robotic vacuum cleaners.

780nm Laser Diode
780nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-6-780-5-P 780 5 5.6 60 P
D6-6-780-5-N 780 5 5.6 60 N
D6-6-780-10 780 10 5.6 60 N
D6-7-780-100-P 780 100 5.6 70 P, no PD
D6-6-785-50-N 785 50 5.6 70 N
D6-7-785-50-P 785 50 5.6 70 P, no PD
808nm Laser Diode
808nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-4-808-200 808 200 5.6 40 N
D6-4-808-500 808 500 5.6 40 N
D9-4-808-1000 808 1000 9 40 N,no PD
830nm Laser Diode
830nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-9-830-200 830 200 5.6 90 P,noPD
850nm Laser Diode
850nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-5-850-50 850 50 5.6 50 N
880nm Laser Diode
880nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-6-880-10 880 10 5.6 60 N
905nm Laser Diode
905nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-7-905-10 905 10 5.6 70 N
980nm Laser Diode
980nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-4-980-50-N 980 50 5.6 40 N
D6-4-980-100 980 100 5.6 40 N
D6-4-980-200 980 200 5.6 40 N
1064nm Laser Diode
1064nm IR Infrared Laser Diode
Product Wavelength Power Φ Tc Type Datasheet Buy
D6-4-1064-50 1064 50 5.6 40 N
D9-4-1064-150 1064 150 9.0 40 N
What is a Laser Diode

The term laser is an acronym that stands for "Light Amplification by Stimulated Emission of Radiation". A laser diode is the semiconductor component that emits laser light when input with the right amount of current (threshold).For common use as an electronic component, the laser diode semiconductor chip is usually encapsulated in a casing for its protection and ease of connection to a circuit.

LED vs Laser Diode

LED are light emitting diodes made from a pn-junction that emits light when a suitable Voltage is applied to its leads. During this state, electrons recombine with holes within the semiconductor device, thereby releasing energy as photons (light particles). The color of the light is determined by the energy band gap of the semiconductor material used for the LED.

The laser diodes have a different structure in that the light is emitted inside a cavity within the semiconductor material. The cavity gives the laser diode its mains characteristics: the Coherence.

The laser light is coherent, which allows the laser to be focused into one tight spot. The laser beams can also stay narrow over great distance, which is called Collimation, which is unique among the light emitting devices. The laser light also has a high temporal coherence, which allows the light to be emitted with a very narrow spectrum (a few nanometers) as opposed to the LED.

Wavelength

The Wavelength is the spatial period of an electromagnetic radiation. Electromagnetic radiations with wavelengths in the range of 400nm to 700nm are perceived by human eye as visible light. Lasers usually show a very narrow wavelength spectrum. For the consumer market, they usually have a wavelength bandwidth of ~1nm, as opposed to conventional light sources that produce white light. White light corresponds to the sum of all visible and invisible (like infrared and UV) waves of the spectrum. A laser diode emits only at a determined wavelength emitted, depending on the semi-conductor material it is made out of..

Output Power

A laser output power can be measured with a Power meter. Lasers can work in CW mode (continuous mode) or in a pulsed mode. Pulses power can be accounted on the basis of their average power or on the peak power of each pulse. Average lasers power ranges from <1mW for laser pointers and other consumer products to several kW for laser cutting applications or laser weapon systems, etc.

Eye Safety

From the first lasers in 1964, it was clear that this light source has a power not only to do the required job, but also it can be very dangerous if operating improperly. Laser safety guidelines were written for consumers, power levels are usually written for visible-light, continuous-wave lasers and are divided into Class 1, Class 1M, Class 2, Class 2M, Class 3R, Class 3B, Class 4. For pulsed lasers and invisible wavelengths, other power limits might apply. In USA it is considered that Class2 lasers are safe for consumers, while EU requires lasers to be Class1. It is suggested for people working with class 3B and class 4 lasers to protect their eyes with safety goggles, which are designed to absorb light of a particular wavelength.

Beam Shape

Laser light is coherent, which allows laser beams to be manipulated in order to create many different shapes, from simple collimated beams to complex patterns (created with DOE lenses). Most frequent patterns comprise: laser dot, round dot, laser line, laser cross, ground line. Custom patterns might be achieved through custom optical elements.

Usage

Many different fields can benefit from laser technology, such as: medicine, various industrial usages, military applications, consumer products, etc.... Nowadays usage of laser ranges from reading data from a CD or a DVD up to measuring the earth to moon distance.

Laser Diode Specifications
Item Symbol Definition
Optical Output Power Po (CW) Maximum tolerable power emission under Continuous Wave (CW) operation
Pulse Optical Output Power Po (pulse) Maximum tolerable power emission under pulsed mode
Reverse Voltage V Maximum tolerable reverse bias voltage applied to a laser diode For laser diodes with a built-in Photodiode, the Reverse Voltage of the Photodiode V(PD) and that of the laser diode V(LD) can be noted separately
Operating Temperature To Laser Diode casing temperature range under which the laser diode can be operated safely
Storage Temperature Ts Laser Diode casing temperature range under which the laser diode can be stored safely
Optical and Electrical Characteristics
Item Symbol Definition
Optical Output Power Po Optical Output Power under the specified forward current (If)
Threshold Current Ith Value of the forward current at which a laser diode starts to emit laser light (lasing)
Operating Current Iop Forward current input at the specified optical output Power (Po)
Operating Voltage Vop Voltage input at the specified optical output Power (Po)
Peak Wavelength λp Maximum intensity wavelength in the spectral distribution of the emitted laser light range
Beam Divergence Parallel to the junction θ// Divergence of a light beam emitted from a laser diode as expressed as the full angle at half of the peak intensity (FWHM) in the parallel profile
Beam Divergence Perpendicular to the junction θ┴ Divergence of a light beam emitted from a laser diode as expressed as the full angle at half of the peak intensity (FWHM) in the perpendicular profile
Temperature characteristics

Laser characteristics (wavelength, operating current) vary with temperature, and variation is more extreme at shorter wavelength.

We recommend installing an APC circuit to maintain a constant output because operating current varies significantly with temperature.

By the same token, laser diodes reliability can be improved by designing products based on their heat release characteristics.

Since the laser diode reliability falls off steeply at a higher temperature, never allow the case to exceed the operating temperature range given in specifications while a laser is in use.

Handling Instructions

1. It is possible for laser diodes to be damaged by spike current, generated when switching the power ON or OFF or when adjusting its output voltage. Before activating diodes, check the transient state of the power supply to assure that it does not exceed the maximum voltage rating.

2. Operate the laser diodes below the maximum optical output power rating in order to prevent mirror facet damage and resultant loss in reliability.

3. The maximum ratings are specified by case temperature at 25˚C. Design should be made well to work with temperature. As temperature goes up, power dissipation as well as maximum light output power is reduced.

Soldering conditions

Maximum temperature is set at 260˚C and soldering time is within 3.0 seconds and minimum clearance of 1.6 mm from the root of a lead is necessary.

Prevention of breakdown due to static electricity or surge current

Laser diodes may be adversely affected by static electricity and surge current, which consequently causes breakdown of elements and reduction of their reliability unless the following actions cares are taken:

(1) Power supply, installation and measuring equipment should be grounded. A noise filter or noise-cut transformer is to be provided to power supply input utilized.

(2) During operation, working clothes, hats and shoes should be static-protected when in use. Also, a workman body should be static-protected by use of an earth-band or the like and grounded through high resistance (500K - 1M).

(3) A soldering iron should be grounded to protect laser diodes from voltage leak.

(4) Any container for carriage and storage should be static-protected.

(5) Avoid using laser diodes at a place where high frequent surge current may be generated as an inductive electric field gives breakdown or deterioration. (Avoid being placed around fluorescent grow lamp, for example).

Laser Diode Product ID Naming Rule:
Product Code: Laser Diode Package Diameter Top(°C) Wavelength Lambda(nm) Output Power Package Type
D: Laser Diode 3: TO Dia.3.3mm 4: 40 405: 405nm 3: 3mW N:type
  4: TO Dia.3.8mm 5: 50 450: 450nm 5: 5mW P:type
  6: TO-18 Dia.5.6mm 6: 60 635: 635nm 10: 10mW M:type
  9: TO-5 Dia.9.0mm 7:70 780: 780nm 50: 50mW  
  C:C-Mount 8: 80~85 808: 808nm 100: 100mW
      850: 850nm 200: 200mW
      980: 980nm 500: 500mW
      1550: 1550nm 1W: 1000mW
      more more
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