Showing papers by "Leo W. Hollberg published in 1994"
TL;DR: In this paper, saturated-absorption signals on the calcium 657 nm transition were observed by direct absorption using diode lasers and a high flux atomic-beam cell with a high signal-to-noise ratio.
Abstract: Saturated-absorption signals on the calcium 657 nm transition are observed by direct absorption using diode lasers and a high flux atomic-beam cell. Line-widths as narrow as 65 kHz are observed with a high signal-to-noise ratio. Prospects for using this system as a compact wavelength/frequency reference are considered.
36 citations
TL;DR: A method for the determination of optical frequencies in the near infrared that is based on the nonlinear generation of the optical sum and difference frequencies of two near-infrared lasers followed by the comparison of the sum and Difference frequencies with standards in the visible and in the far infrared is proposed.
Abstract: We propose a method for the determination of optical frequencies in the near infrared that is based on the nonlinear generation of the optical sum and difference frequencies of two near-infrared lasers followed by the comparison of the sum and difference frequencies with standards in the visible and in the far infrared, respectively. We also address questions of practicability and discuss some examples open to the method.
12 citations
23 May 1994
TL;DR: In this paper, a low-cost, phase-lock circuit for slaving an extended-cavity diode laser to a stabilized reference laser has been developed, which allows continuous tuning of the laser difference frequency between 5 MHz and 1.5 GHz.
Abstract: A low-cost, phase-lock circuit for slaving an extended-cavity diode laser to a stabilized reference laser has been developed. Grounded coplanar waveguide and surface mount technology have been used. An internal mixing stage allows continuous tuning of the laser difference frequency between 5 MHz and 1.5 GHz. Absolute phase locks exceeding 8 hours have been demonstrated. >
7 citations
27 Jun 1994
TL;DR: In this paper, a frequency doubled diode laser system was used with an atomic beam and a high-flux calcium beam-cell to provide narrow saturated-absorption resonances.
Abstract: Diode lasers at 657 nm are used with an atomic beam and a high-flux calcium beam-cell to provide narrow saturated-absorption resonances. Stability of /spl ap/3/spl times/10/sup -14//spl tau//sup 1/2 / is projected based on signal-to-noise ratios. Laser cooling is possible with a frequency doubled diode laser system that produces a usable 35 mW at 423 nm. >
2 citations
26 Aug 1994
TL;DR: In this paper, the frequency doubling Yag system was used to measure the Iodine transition at 532 nm with a high signal-to-noise ratio using diode-pumped Yag-laser.
Abstract: : Promising optical frequency/wavelength standards in the visible based on neutral atoms and precise laser sources are studied. In particular we have developed high accuracy systems using diode-lasers with calcium atoms and also diode-pumped Yag-lasers with Iodine molecules. An actual frequency measurement of the Iodine transition at 532 nm is made with the frequency doubled Yag system. On the calcium transition at 657 nm in the red, optical Ramsey-fringes as narrow as 10 kHz have been observed with a high signal-to-noise ratio using diode lasers. High resolution multi-photon spectroscopy on laser cooled and trapped atoms (Na and Cs) have also been explored. In these pursuits, significant new diode-laser and frequency- measurement technology has been developed, including; highly stabilized diode and Yag lasers, the ability to coherently measure the frequency difference between two lasers to as high as approx. 700GHz, and the extension of the spectral coverage of diode laser sources to the blue (for laser cooling of calcium) and IR spectral regions by using nonlinear optical techniques. jg
1 citations
27 Jun 1994
TL;DR: In this paper, an electronic circuit for phase-locking extended-cavity diode lasers to a stable reference laser is presented, operating with input frequencies between 5 MHz and 1.5 GHz and allowing synthesizer tuning of the difference frequency between the lasers.
Abstract: We have developed an electronic circuit for phase-locking extended-cavity diode lasers to a stable reference laser. The basic phase-lock operates with input frequencies between 5 MHz and 1.5 GHz and allows synthesizer tuning of the difference frequency between the lasers. An external mixing stage can be used for an arbitrary frequency offset. >