Atomic wavelength reference for a temperature-tunable 1341-nm Nd(3+):YAlO(3) laser.

A miniature monolithic diode-pumped temperature-tunable Nd(3+):YAlO(3) laser can be set anywhere within its 1-nm tuning range with a long-term stability of 1 pm by using an optogalvanic signal from the 1341.1686-nm 5s-3p transition in helium and the measured temperature tuning rate of the laser.

Temperature tunable 1341-nm monolithic Nd(3+):YAIO(3) laser.

A short cavity monolithicN d(3+):YA10(3) laser pumped by a forty-stripe diode array has produced 7 mW of TEM(00)power in only three longitudinal modes. The central mode is smoothly temperature tunable from 1341.0 to 1341.6 nm at the rate of 15.0 +/- 0.5 pm/ degrees C.

Diode-pumped 1.34-microm Nd(3+):YAlO(3) laser.

We have pumped Nd(3+):YAlO(3) lasers with a 40-stripe, 500-mW, 807-nm diode laser. Maximum output powers at 1.34 microm of 26 mW multimode and 20 mW in a single transverse mode were achieved. The several longitudinal modes had a total spectral width of ~0.4 nm.

Photomultiplier single photon counting efficiency.

An RCA C31000F (8853) photomultiplier with a cathode quantum efficiency of 5.5% (for 633-nm light) was found to have a single photon counting efficiency of only 3.3%. The difference is shown to be due to small pulses well below the single electron peak in the output pulse height spectrum. These pulses are usually below the discriminator threshold level and are not counted. The reason for the small pulses is not understood.

Two-photon correlations in a mixture of gaussian and laser light.

Measurement of the two-photon time distribution in a mixture of light from a He-Ne laser and a Gaussian source of the same central frequency agrees well with the prediction of coherence theory when the laser is represented by a single coherent state. The peak in the distribution near zero time difference is made up of contributions due to the second-order interference between pairs of Gaussian photons and between laser and Gaussian photons.