An ideal situation exists where a manual red (632.8 nm) HeNe laser is network being used to test a green (543.5 nm) HeNe tube or vice-versa.
Adding a Start Wire As noted elsewhere, many HeNe laser heads have some type of starting wire or start tape running from the anode along the tube to the vicinity of the cathode.
I have modified the rear end-cap to allow the second beam to exit without requiring repeat surgery each manual time tests are to be performed.
Something for the future!Try to obtain agreement on several of the following tests as no single one is necessarily a guarantee of correct identification: The anode connection will be the center conductor if the cable is a coaxial type, the fat dish wire if they are not the same.( 594.1.) Assuming the temperature of the mirror climbs from 20 C to 70 C during warmup, for the 4 mm thick mirror substrate, the optical length will increase by about.76 um.3 half-wavelengths of 594.1.Then I loosen up the HR so it has a lot of play.As examples of other color tubes: Yellow (594.1 nm) and Green (543.5 nm) HeNe lasers tend to have a discharge that is more pink but just as bright as the normal red-orange discharge.Also see the section: Unstable or Flickering HeNe Tube.Attempt to compare the physical dimensions with those of tubes with known output power.This is the classic PMS/REO HeNe laser tube design with an HR mirror frit-sealed to a metal mount on the left, a short glass section, a metal cylinder running much of the length of the tube, reciver and an OC mirror frit-sealed to a metal mount.I routinely do this even for red HeNe lasers and have often manual found substantial errors even for supposedly properly manual adjusted lasers.This is called the 'Front Pinhole'.But that's probably the best that can be done with these mirrors.This is called the 'Rear Pinhole'.A basic meter movement (say, 100 uA) and suitable current limiting resistor (rated for the high voltage) can also be used.Try another dish power supply if available. And as confirmation, an Alden cable was game clearly visible; Bombs don't use Alden cables.
There are much cheaper ways of accomplishing the game same thing.
And, as of mid-2019, Coherent no game longer even sells rebadged game Melles Griot HeNe lasers!
Noble gases can not be gettered either, so their gas pressure will determine the cracked final gas pressure in a picture tube." Of course, for a HeNe or Ar/Kr ion laser, those manual inert gas molecules ARE the desired result!
For the typical internal mirror HeNe laser tube,.15/m and B will be close to 0 assuming there is no internal Brewster plate or etalon.
For 10 or 15 years, hood barcode scanners used mass-produced red HeNe laser tubes often designed for least cost.
See Cleaning Brewster Windows with Ammonium Bifluoride.
I thought the central portion of the mirror was in good condition, but perhaps not enough.88 098 LT2R LHR-080 Current.5-1.8.25 mW 1 mW 2 mW 2 mW I(n) V(n) R(n) V(n) R(n) V(n) R(n) V(n) R(n) V(n) R(n) V(n) R(n).5.0 mA K 1064 -70K.5 mA 1110 -61K K 1033 -57K 1667.0 mA 1080 -58K.After being idle for about 2 years, the power had again declined, but only to about 25 percent of the recovered level.(Of course, your computer monitor has to be reasonably well adjusted for these to be at all accurate and even then they will not be quite the same as the real thing.) Discharge viewing must be through a glass part of the tube, not the.10 mA: 401*.In this case we were seeing a low level intensity modulation that would start at approximately 60 Khz, sweep through zero and back to 60 Khz and then disappear for several seconds before starting again.Removing the turntable or disabling the stirrer and then identifying the area(s) of peak microwave intensity may also permit more selective treatments.Take care that the green wires line up in the two halves of the connector!I do wonder if some of the very slow improvement near the end is actually due to the tube aging.Ignoring losses, hitchhikers a modest change in OC reflectivity will change the intracavity power almost in proportion to the change in reflectivity, so that the output power will change only slightly.