All Questions
27
questions
2
votes
2
answers
200
views
Powering on a laser diode that exceeds PSU max current
I have a laser diode that I want to test (just seeing if it turns on). However, the threshold current is past the 10A that my bench power supply can supply, hence I can't generate any light. How can I ...
- 209
1
vote
0
answers
65
views
Impact of laser current source noise on RIN (relative intensity noise)
I am trying to specify the noise requirements for a constant-current source that would drive a diode laser with a certain relative intensity noise PSD. Lasers typically behave as forward-biased ...
- 46
0
votes
1
answer
213
views
Confused with the biasing pins for this laser diode
If I want to DC bias the following laser diode it seems I need to use pin 3 with a current source (drawn in red by me) as follows:
Description of the pies are shown below:
There is no anode pin nor ...
- 1,016
4
votes
6
answers
948
views
How can I make a constant current source for a CW laser diode?
I need to power a single CW laser diode with a constant current source. I have attached the datasheet of the laser. It is a 2.2-2.4V laser whicht operates at 80mA at full brightness.
I see a lot of ...
- 91
7
votes
2
answers
2k
views
Constant current source design considerations
I am designing a constant current source to drive a laser diode.
I need it to be adjustable (from 0 to 100mA max) and stable enough as I will be using it as a light source in a Foucault mirror tester ...
- 97
3
votes
2
answers
285
views
High Frequency Laser Modulation
I am looking at doing some phase-shift lidar experimentation.
To get good accuracy, all the papers suggest that I need to be modulating the laser diode sinusoidally at ~200MHZ.
I am finding ...
2
votes
1
answer
161
views
Detector for a fiber optic gyroscope
I'm a navigation engineer, so I often have to deal with gyroscopes and their measurements. Out of curiosity, I've decided to build one myself and will give it a try with a Fiber Optics Gyroscope (FOG),...
- 21
1
vote
2
answers
215
views
Relation between diodes and laser diodes
I am currently studying Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5 Resistance, Resistivity, and Conductivity presents makes the following claim when ...
- 1,281
-2
votes
1
answer
799
views
Laser diode help? [closed]
I recently took apart an old DVD player, for the laser diodes, but instead I found some strange looking components with many pins.
Please help me find out what they’re are and the pinouts🙏🏻
0
votes
2
answers
218
views
Powering an IR + RED laser with an Arduino
I am hoping to run a laser diode from an Arduino.
The specific one with included data sheets are here:
https://industrial.panasonic.com/kr/products/semiconductors/laser/red_infrared/red-and-infrared-...
1
vote
2
answers
349
views
Laser Diode Feeding
Edit: Laser diode info page
I have a basic question about laser diodes. For a 14-pin butterfly package as shown below. I know that I need to control the current going in to the laser diode, but I don'...
- 96
1
vote
2
answers
3k
views
Driving a laser diode with an LM317
I want to make a a line of sight sensor. I want to drive a laser diode with constant current and aim it at a photodiode, then using a transimpedence amplifier I will monitor any changes in light ...
-5
votes
1
answer
137
views
Transmit audio via laser: unexplainable Diode
I'm currently trying to build a circuit to transmit audio via laser. It works great and the quality is decent. But I don't get the reason for the diode. If I remove the diode and replace it with a ...
- 101
2
votes
1
answer
554
views
Characteristics of a Laser Diode Below Threshold
This question is related to that one:
Can laser diode be operated with lower than specified voltage?
I am driving a laser diode in a current controlled fashion. What actually happens below the lasing ...
- 135
10
votes
4
answers
9k
views
What's the difference between a laser diode and ordinary LED?
What are the discerning properties that distinguish them; determining their different characteristics?
In other words, I'm trying to do a compare / contrast:
What do they have in common?
How are ...
- 1,089