Have you ever built a DPSS laser of any wavelength even a relatively simple to achieve 532nm green DPSS?
As ultimatekaiser said above. The cost and a big if >> if you can get anyone to make or sell the parts to you for you to attempt to make one. Cost generally would be prohibitive unless you were to order production quantities if you could find any crystal and parts makers willing to bother.
589nm DPSS lasers are brutally inefficient (like 1%), and incredibly unstable. You are running basically two lasers in the cavity pumped by one diode. Using the primary lasing line of YVO4 and a secondary lasing line they are summed and frequency doubled. The coatings on the YVO4 and the NLO crystal are very exacting as well as they cut of the crystals due in part to the slightly different index of refraction inherent in the two lasing lines. Really very tricky to make even for advanced photonic engineers to accomplish---not a playtime with technology activity.
While a few manufacturers will make 589nm lasers on request they are not the norm and are far more complex and expensive than 532nm for instance.
There are real reasons that the only manufacturer on the planet that makes and has available as standard items individual/single piece affordable 589nm lasers is CNI. Everyone offering 589nm lasers is just reselling CNI made product.
Seriously doubt CNI would sell proven reliable component parts to be able to make one and even if they would do that, the cost would be as high or higher than a complete 589nm laser but you can ask.
Their hand held models are pulsed to reduce heat generated by the high output pump diode. if I remember correctly.
589nm takes a lot of IR pump power for very low output of 589nm.
See CNI product listings:
http://www.cnilaser.com/yellow_laser589.htm
See CNI distributors here:
http://www.cnilaser.com/Contact.htm
Lower priced reseller of CNI 589nm lasers here:
https://www.civillaser.com/index.php?main_page=index&cPath=42_122
Higher priced Distributor/rseller:
https://www.ultralasers.com/lasers-series.php?cat=35
" Yellow laser pointers emitting at 593.5 nm became available in recent modern times.. Although they are based on the DPSS process, in this case two lasing lines of the ND:YVO4, 1064 nm and 1342 nm, are summed together with a nonlinear crystal. The complexity of this process makes these laser pointers inherently unstable and inefficient, with their outputs ranging from 1 mW to about 10 mW, greatly varying with temperature and usually mode-hopping if they get too hot or too cold. That is because such a complex process may require temperature stabilizers and active cooling, which can't be mounted into a small sized host. Also, most smaller 593.5 nm pointers work in pulsed mode so they can use smaller and less powerful pumping diodes. New 589 nm yellow laser pointers have been introduced using a more robust and secretive method of harmonic generation from a DPSS laser system. " from:
https://en.wikipedia.org/wiki/Laser_pointer
Have a look at this research abstract, maybe get the whole article if interested:
https://www.sciencedirect.com/science/article/pii/S0030402615014345?via=ihub
"We report the efficient compact 589-nm yellow laser generation by intra-cavity sum-frequency of a
continuous wave (cw) laser operation of a diode-pumped double Nd:YAG crystals at 1064 nm and 1319 nm. An LiB3O5 (LBO) crystal, cut for critical type I
phase matching at room temperature, is used as the nonlinear optical crystals for frequency summing. A
maximum output power of 102 mW in the yellow
spectral range at 589 nm was achieved at an incident pump power of 2 W. In 40 min we achieved an optical-to-optical conversion efficiency of 5.1% with a power instability less than 5.66%, the configuration is compact, flexible and efficient. "
