Questions tagged [laser]
Questions regarding devices which emit focused beams of electromagnetic energy.
64
questions
7
votes
2
answers
157
views
Would a laser seismometer work from lunar orbit?
Lasers today have become extremely sensible, they can detect sub-millimeter movements of a surface from a distance. Could this feature be exploited to create a lunar seismometer working from a probe ...
- 191
15
votes
2
answers
2k
views
How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory?
LISA is a proposed space probe designed to measure gravitational waves. It aims to measure gravitational waves directly by using laser interferometry. It uses a drag-free satellite design to protect ...
- 22.8k
5
votes
1
answer
316
views
Deep Space Optical Communications (DSOC) - from what distance could a flashlight be detected by a space-based telescope
Flight laser transmitter - for Psyche mission has Mass 29 kg (100 W).
It also requires pointing up to 3 degrees of the Sun (towards the receiver telescope).
My question is about really small probes (...
2
votes
1
answer
252
views
Has anyone in space beyond LEO seen or has anything photographed a non-pointer laser from Earth?
The two current answers to Has anyone in space seen or photographed a simple laser pointer from Earth? both describe small, low power lasers from Earth aimed towards the ISS in LEO.
Here I'd like to ...
- 148k
3
votes
1
answer
131
views
Precise Orbit Determination (POD) vs GNSS accuracy; seeking references
Precise orbit determination provides performances that are not currently achievable with GNSS systems. I cannot find information of the reason for this. I imagine different possibilities:
Use of ...
- 51
2
votes
1
answer
139
views
Transmit power for low/high wavelength [closed]
I am reading the book: Kaushal, H., Jain, V.K. and Kar, S., 2017. Free space optical communication. New Delhi: Springer India.
I have asked before about a reason of choice of wavelength for beacon ...
- 125
4
votes
2
answers
496
views
What are the reasons for the specific operating wavelengths chosen for laser communication?
I am reading the book: Kaushal, H., Jain, V.K. and Kar, S., 2017, Free space optical communication, New Delhi: Springer India.
The operating wavelengths for beacon and data transmission were discussed....
- 125
0
votes
1
answer
148
views
Beacon (PAT) in optical free space communication [closed]
Nanosatellite Optical Downlink Experiment (NODE) mission has 3 "signal":downlink, beacon uplink and RF.
According to a description of the mission, the high-rate downlink and beacon uplink ...
- 267
1
vote
1
answer
247
views
Frequency/Spectrum regulation document for laser communication
For RF we have the frequency allocation table, where the RF spectrum is regulated. Optical has big bandwidth, there is a lot of frequency space.
How do we regulate optical spectrum? I didnt find any ...
- 71
1
vote
1
answer
473
views
Receiver and transmitter in RF/optic satellite communication: distance vs data rate v2
The first version of this question is here.
I have read the article "Optical communications work best over relatively short distances in space." by Toyoshima, M., Leeb, W., Kunimori, H. and ...
- 71
1
vote
1
answer
676
views
Have "space lasers" really been used to temporarily blind US satellites?
In CNN's video An exclusive look into how Space Force is defending America they talk with Gen. John W. Raymond, Chief of Space Operations, US Space Force.
After about ...
- 148k
3
votes
1
answer
241
views
Small probes to Alpha Centauri powered by light sails with a journey time of 20 years
This news item states that scientists have potentially devised a way to send a number of small probes to Alpha Centauri at quarter the speed of light. The journey would take 20 years and each small ...
- 13.1k
2
votes
1
answer
84
views
Did Perseverance get an experimental optical communications terminal?
The video Donald Cornwell plenary talk: NASA's Optical Communications Program: 2015 and Beyond was presented at SPIE Photonics West 2015. It's a great talk and worth the time.
Near the end at about <...
- 148k
3
votes
1
answer
104
views
How did LADEE and LDRC measure it's distance from Lunar orbit to Earth to 1 centimeter accuracy using optical communications?
The video Donald Cornwell plenary talk: NASA's Optical Communications Program: 2015 and Beyond was presented at SPIE Photonics West 2015. It's a great talk and worth the time.
LADEE had [the Laser ...
- 148k
5
votes
2
answers
213
views
Using lasers to reach the Karman line
I've just seen this Anton Petrov video: New Type of Laser Levitation Could Help Us Explore the Mesosphere. It's about this new form of levitation that uses lasers to heat up the air underneath a craft,...
- 822