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I recently had a bit of a splurge on TinkerLasers.com I decided to chase down some different wavelengths that I haven't previously had access to and made a late-night order (or two) for several lasers from TinkerLasers.com. This splurge consists of: 405 nm pen 488 nm pen 561 nm pen 425 nm...

Battery compatibility update: I received a delivery from Mr Bezos with the XTAR 1.5V Li-ion rechargeable AAA-equivalent, and immediately noticed an issue with the case-negative lasers (direct diode 405nm and 488nm) The tail cap doesn't have a spring or contact bump to interface with the...

Ordered several items from TinkerTavern, including 488nm and 561nm pen style lasers which were among the first items shipped. My photography-fu is weak, and I'm currently away from home, but here are some phone pictures of the new lasers projected onto an off-white wall. Diffraction caps to...

I have some pictures of the laser in the postive pressure chamber. It's just an 80/20 frame with plexi panels. There is a blower fan installed on top which blows air into the box. The fan has been fitted with a piece of air filter (cut from a typical furnace air filter) which keeps the inside of...

Okay, a very belated update on the Twins laser (I'm writing my dissertation so this has been near the bottom of my priority list :( ) A laser technician from Quantel happened to be in the area and we disassembled the laser head to diagnose the problem. Ultimately, the problem was dirt in the...

Among other lasers, I work with Frequency-doubled pulsed YAG in my lab. One of our laser cavities is acting up and I wanted to share the debugging process as it might be informative to anybody building/repairing/restoring a similar laser. The laser is an old Quantel "Brilliant" and part of a...

1)The flow rates I mentioned are based on the readout from a flowmeter calibrated for the kind of gas that we're monitoring. I trust your flow rate measurement :) I was simply commenting that my guesstimate of a 7m/s flow speed was too small! 2) The goal is to only have one sample per...

1) The tube is .032" ID. This happens even before any gas is being run through it. I cannot calibrate the unit with gas and particles. Also, we clean the flow cells thoroughly after assembly has completed. Then your flow rates are even higher... If you are sampling at ~100kHz, then the duration...

What are the scales on your oscilloscope traces? What does an aerosol particle trace look like? Do you only see the noisy signal when the gas flow is off? Are there any switching power supplies in the area? Out of curiosity, what is the size of the tube through which the the particles are...

Shellback, If you are confident in your diode supply and temperature regulation, then perhaps you are experiencing mechanical vibrations. Is it possible that mechanical vibrations are moving your focal point relative to the mask? What kind of structure is your experiment operating on? Are you...