Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [laser-driver]

63 questions
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500mw laser diode: What's the point of a driver and will it need a lens to focus?

For a hobby project I recently bought a laser diode with the following specs: Mitsubishi 645-655nm 350-500mw High-Power Red Laser Diode LPC-836 Power output: CW 380mW Pulse Power: 570mW Working Current: <340mA Working Voltage: 2.2-3.0V Sealed…
Pedery
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3 answers

Building a laser driver circuit?

I have a small laser diode I ripped out of a CD/DVD read write drive. It has 3 pins on it and my first question is what function does the third pin have? Is it a second ground? How do I go about determining the function of each pin safely without…
Shane Yost
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Can I simply adjust the output power of these laser diodes to meet my specifications? If so, then what are the consequences of doing such a thing?

I need a CW laser diode, with an integrated photodiode, with wavelength around 800nm and power 1-1.5mW. Although I didn't find anything that exactly matching my specifications, I did find this from Thorlabs and this from Roithner Lasertechnik.…
The Pointer
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How can I read the current from a monitor photodiode of a laser diode?

I bought a adl-65074tl-1 laser diode, I am trying to drive it and to read the feedback of the monitor photodiode with an oscilloscope. I am using a laboratory DC power supply and a multimeter for setting the voltage value of the diode to the 2.2 V…
G M
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Why do laser diodes need temperature controllers? Why not just cool them?

High quality laser diodes often require temperature controllers plus a "TE" (thermoelectric unit) that cool the diode and maintain it at a particular temperature using a Peltier cooler. Why not just cool the diode without a controller? Is there some…
Tyler Durden
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Constant-current source circuit for a laser diode

I'm planning to use a circuit as a laser diode driver shown in this datasheet. It is not for production, just for lab test purposes, but I would like to obtain fair accuracy and be sure the circuit won't exceed its max. limits. The laser diode specs…
cm64
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How to design an adjustable 5A current regulator with LM338?

I have recently taken interest in laser diodes, and I would like to drive one of them (NUBM08) without destroying it. Looking over the internet I learned there are many devices one can build to do this, one of which is called "linear regulator".…
RandomGuy
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How to dim one of these cheap 5mW laser modules?

I used to have an old 3x LR44 lithium cell laser pointer for presentations. With the batteries slowly dying, the outputted beam also went dimmer. Recently I bought one of these cheap 650nm laser modules off eBay. They seem to be designed to work…
isync
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How to transmit data with a laser beam?

I am working on a project about data transmission with lasers. The project is very young so I can modify my current planned setup if necessary. This is the actual planned setup: Every raspberryPi can control a laser (probably via a dedicated…
Rocco Mancin
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how to drive a VCSEL?

I want to drive a VCSEL with the MAX3795 driver, but this ship has a very complicated circuit on it pins. Is there is another available driver with a simpler circuit that i can use ?
optical
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Laser diode stops working after a few runs

I wanted to generate a laser pulse between 1 us and 50 us by creating a simple circuit with a source meter, as I didn't have a laser driver. At the beginning, the setup seemed to work as intended (I tested it with optical spectrum analyzer).…
user3602697
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Connecting laser diode to a driver

I'm attempting to connect an infrared laser diode to a laser diode driver circuit. I'm inexperienced with electronics and am having difficulty interpreting the technical information of my parts. The laser diode is a ARIM ADL-78051TL. Its datasheet…
lars
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Adding PWM option to continuous wave laser driver

I've been struggling for a few weeks now trying to add a PWM option to my CW laser diode driver design which works OK. When adding a MOSFET or BJT to PWM the output, I'm getting voltage spikes and noise. This is bad for the driver since the laser…
s1ngames
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Driving a 14-pin with DFB laser using D2570H

For our project, we would like to use the D2570 DFB laser from Agere system since it has a built-in photodiode with a TEC sensor, thermistor and a bias-tee embedded in an 'all-in-one' package. However, we don't understand the principle of the bias…
Kwok
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How to improve a high frequency square wave for laser imaging

I am trying to create a current source for laser direct imaging and I have a problem in the circuit I cannot solve. The laser is a 120 mW 405nm diode and I use it in a laser module from a laser printer. The circuit for the BLDC motor with the…
hennep
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