Is Wavelength Doubling Laser a Real Technique?

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Wavelength doubling is not a recognized technique in the same way as frequency doubling, which effectively halves the wavelength of light. The discussion highlights that frequency doubling is commonly used in lasers, such as green laser pointers, through a process known as second harmonic generation. The inverse process, known as parametric down conversion, is mentioned as a theoretical counterpart to frequency doubling. Efficiency of these processes can vary, but specific metrics were not detailed in the discussion. Overall, while frequency doubling is well-established, wavelength doubling remains an ambiguous concept in laser technology.
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I've heard of frequency doubling but is wavelength doubling a thing? If so, how efficient?
 
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Frequency doubling divides the wavelength in half: http://www.rp-photonics.com/frequency_doubling.html

The inverse process also works, and is usually called parametric down conversion:
http://en.wikipedia.org/wiki/Spontaneous_parametric_down-conversion

Your green laser pointer is an example of frequency doubling/second harmonic generation:
http://en.wikipedia.org/wiki/Laser_pointer#Green
See the schematic diagram on the right hand side - enlarge, and follow the red beam into the crystal which generates the green beam.
 

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