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Lasence: Yellow laser modules just got cheaper

bulukaki

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I visited Lasence on alibaba today and found that their 575nm lineup just got a significant price drop (was $270-ish before), and now they have even cheaper 561nm options (woah!)

570nm or 575nm 20mW CW? $200
570nm or 575nm 10mW CW $100

561nm 20mW CW $85
561nm 15mW CW $70
561nm 10mW CW $40
561nm 5mW PWM $23

(p.s. I'm not affiliated in any way with lasence... just excited about their yellow modules)
 



Ears and Eggs

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Very cool, something in the 570-575nm range is definitely next on my last. That yellow-golden yellow has got to be favorite color after the 488 aqua/blue.
 

gazer101

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Sadly the DHL global shipping is quite expensive...
If only I had someone in China who could receive it and forward it to me (with duties declaration of course, ain't tryna get on the tax evaders list)
 

ZRaffleticket

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Sounds like they have 571nm available in their current batch, with 561nm hopefully being ready in the next couple weeks. I already have a few OPT 57Xnm's so I'm not so much interested in theirs.
 

Sowee7

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Sounds like they have 571nm available in their current batch, with 561nm hopefully being ready in the next couple weeks. I already have a few OPT 57Xnm's so I'm not so much interested in theirs.
I told them to start producing those 575 and 570nm modules
 

Sowee7

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Sounds like they have 571nm available in their current batch, with 561nm hopefully being ready in the next couple weeks. I already have a few OPT 57Xnm's so I'm not so much interested in theirs.
Also they have 18 561nm modules in stock
 

ZRaffleticket

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Are they the pulsed modules? I talked with them last night and I was told none of the CW ones were available.
 

Encap

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Are they the pulsed modules? I talked with them last night and I was told none of the CW ones were available.
He is probably meaning these as he bought one piece and reported that 18 were available in post #28 in this thread on 7 April see: https://laserpointerforums.com/threads/looking-for-yellow-laser.108170/page-2#post-1599578

This module https://lasence.en.alibaba.com/prod...l?spm=a2700.shop_plgr.41413.15.4aeb3b0dVCbSAo


Yes all of them are pulsed -- PWM/50% 110Hz
 
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Sowee7

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gazer101

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If you pulse it fast enough you won't even tell its off half the time no?
 

ZRaffleticket

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Ah yeah. Gotcha. I'm waiting for the 20mW CW modules for a few reasons. I already have a host ready for that size, I am not a fan of pulsed lasers, plus with just a short wait I can squeeze a few extra mW out.
 

Encap

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If you pulse it fast enough you won't even tell its off half the time no?
Guess that you have never seen a motion picture or a laser show projector in operation--no? lol

"The flicker fusion threshold, or flicker fusion rate, is a concept in the psychophysics of vision. It is defined as the frequency at which an intermittent light stimulus appears to be completely steady to the average human observer.

As long as the modulation frequency is kept above the fusion threshold, the perceived intensity can be changed by changing the relative periods of light and darkness. One can prolong the dark periods and thus darken the image; therefore the effective and average brightness are equal. This is known as the Talbot-Plateau law. Like all psychophisical threasholds, the flicker fusion threshold is a statistical rather than an absolute quantity. There is a range of frequencies within which flicker sometimes will be seen and sometimes will not be seen, and the threshold is the frequency at which flicker is detected on 50% of trials.

Different points in the visual system have very different critical flicker fusion rate (CFF) sensitivities; the overall threshold frequency for perception cannot exceed the slowest of these for a given modulation amplitude. Each cell type integrates signals differently. For example, rod photoreceptor cells, which are exquisitely sensitive and capable of single-photon detection, are very sluggish, with time constants in mammals of about 200 ms. Cones, in contrast, while having much lower intensity sensitivity, have much better time resolution than rods do. For both rod- and cone-mediated vision, the fusion frequency increases as a function of illumination intensity, until it reaches a plateau corresponding to the maximal time resolution for each type of vision. The maximal fusion frequency for rod-mediated vision reaches a plateau at about 15 Hz) whereas cones reach a plateau, observable only at very high illumination intensities, of about 60 Hz.

In addition to increasing with average illumination intensity, the fusion frequency also increases with the extent of modulation (the maximal relative decrease in light intensity presented); for each frequency and average illumination, there is a characteristic modulation threshold, below which the flicker cannot be detected, and for each modulation depth and average illumination, there is a characteristic frequency threshold. These values vary with the wavelength of illumination, because of the wavelength dependence of photoreceptor sensitivity, and they vary with the position of the illumination within the retina, because of the concentration of cones in central regions including the fovea and the macula, and the dominance of rods in the peripheral regions of the retina."
From: https://en.wikipedia.org/wiki/Flicker_fusion_threshold

Iphone app flicker tester for those interested in same - "The Flicker Tester app for iPhone from Viso Viso systems, makes it possible for the first time to measure flicker coming from LED light sources and LED video screens."

 
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hakzaw1

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FYI
I have a yellow HeNe (thanks Sam) & it is ~6 mW -- BUT very bright.
SO-- imo the higher priced/mW may not be what you really need.

hak
 

Unown (WILD)

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FYI
I have a yellow HeNe (thanks Sam) & it is ~6 mW -- BUT very bright.
SO-- imo the higher priced/mW may not be what you really need.

hak
Yellow is second to green in brightness isn't it? That must be really bright to see. Now I'm starting to want a yellow laser
 

Sowee7

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i had just discovered something, i decided to tear down my 561nm and 575nm laser modules and i found that they are using the same pump diode, i can use the smaller lasence pump diode to pump the 575nm crystal edit: i can use an 808nm pump diode to pump the 575nm and 561nm crystals
 
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