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I agree. Please post pictures to clarify your question Singlemode

Doubling the NA won't double the beam size, the beam size will stay the same (Only the focal length matters). They recommend 2xNA because 1xNA means that 5% of the beam are clipped and diffraction errors and imaging errorsare introduced. With 2xNA you don't have this problem. Singlemode

I don't really get you problem. Is this about the thorlabs statement? Singlemode

With multimode laser diodes it is physically impossible to get the same beam diameter for both axes and the same beam divergence at the same time. Singlemode

You don't need an accurate power meter if you want to measure the reflectivity of a mirror, just a precise one. The weapon of choice here is a large photo diode, reverse biased (for a highly linear response) and a resistor to convert current to voltage. Photodiodes don't have the thermal...

Nice! Can't wait to see some beam shots. Singlemode

This article is very bad and not even mentions the wavelength. If you look the mentioned publication up: https://iopscience.iop.org/article/10.7567/APEX.9.012101 The have made 565nm laser diodes in their lab. If this can be considered yellow or green is something I don't know. Singlemode

Wuff wuff Singlemode

It's not close but exactly what you have posted previously. And why you say you can't link everything and then post a figure from a paper? Singlemode

It is master oscillator power amplifier system. A low power single frequency (dbr) diode is amplified to W powers. From right to left: DBR Diode, two cylindrical lenses to collimate, optical isolator, two cylindrical lenses to focus into the amplifier, amplifier, two cylindrical lenses for...

You need to limit the current through the LED or you will kill it. Take a resistor between your voltage supply and the led so the current through the resistor is about 20mA. Singlemode

It is specced to run at 100mW compared to the specced 55mW foe the sharp ones, so I assume more power too if both are overdriven, like we all do with the diodes. But yeah, otherwise its not a big difference... Singlemode

Nice found, I would have bought the nichia 518nm diode. Nice beam profile :) Singlemode

Dichros are what you need, pbs are also fine if you don't have problems with orthogonal polarization. Singlemode

Nice find. Hope to see this diodes in action. Singlemode

No you just can't beat the physics here: https://en.m.wikipedia.org/wiki/Airy_disk and for non Gaussian beams: https://en.m.wikipedia.org/wiki/M_squared "The diameter of the multimode beam is then M times that of the embedded Gaussian beam everywhere, and the divergence is M times greater...

You are not right here. A multi mode diode just can't be focused to the same spot as a singlemode diode in the case of a diffraction limited spot. All optics in world would not change this. More power would burn bigger spots, and that's it. This is also the reason why the blue ray was developed...

The whole point in going from IR CD burners to the 405nm for Blue-ray is the reduced focus size. This however only holds for a single mode laser (Gaussian beam or 00 mode). A multi mode laser diode would have a focal size multiple of the one from a singlemode diode and would result in a fast CD...

Laser linewidth and laser bandwidth mean the same but linewidth is used more often to describe a narrow spectrum for a single frequency laser and bandwidth usually a broader spectrum. Singlemode

The specsheet attached to this thread tells that the heater has a temperature dependent resistance and that this resistance should be used for temperature control. I assume a PWM based driver could measure the resistance for sensing at the same time as driving. Singlemode