Del Mar Photonics - Newsletter April 2011
JILA group created the world's first ultracold Fermi gas of 40K atoms in 1999; this accomplishment was selected as one of the top 10 scientific breakthroughs of that year by Science magazine. To create the quantum gas, we extended the magnetic trapping and evaporative cooling techniques used to make Bose-Einstein condensates (BECs). In so doing, we had to solve the problem of cooling a spin-polarized gas of fermions that wouldn't collide at low temperatures. (Without collisions, evaporative cooling cannot progress.) We defeated this problem by trapping two spin states of 40K in the f=9/2 hyperfine ground state. Even though fermionic atoms in the same spin state cannot collide at ultralow temperatures, atoms in different spin states will.
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ScienceDaily (Sep. 19, 2008) — Scientists at JILA, a joint institute of the
National Institute of Standards and Technology (NIST)and the University of
Colorado at Boulder (CU-Boulder), have applied their expertise in ultracold
atoms and lasers to produce the first high-density gas of ultracold
molecules—two different atoms bonded together—that are both stable and capable
of strong interactions. The long-sought milestone in physics has potential
applications in quantum computing, precision measurement and designer chemistry.
March 29, 2011
Frequency-stabilized CW single-frequency ring Dye laser DYE-SF-007 pumped by DPSS DMPLH laser installed in the brand new group of Dr. Dajun Wang at the The Chinese University of Hong Kong.
| Dr. Dajun Wang's Research Interests Ultracold polar molecules Bose-Einstein condensate and quantum degenerate Fermi gas High resolution spectroscopy Femtosecond frequency comb and ultra-stable lasers |
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Selected Publications
D. Wang, J. Qi, M. F. Stone, O. Nikolayeva, H. Wang, B. Hattaway, S. D.
Gensemer, P. L. Gould, E. E. Eyler and W. C. Stwalley
"Photoassociative Production and Trapping of Ultracold KRb Molecules", Phys.
Rev. Lett. 93, 243005 (2004).
D. Wang, E.E. Eyler, P.L. Gould, and W.C. Stwalley
"State-Selective Detection of Ultracold KRb X^1\Sigma^+ and a^3\Sigma^+
Molecules", Phys. Rev. A 72, 032502 (2005).
D. Wang, C. Ashbaugh, J. T. Kim, E.E. Eyler, P.L. Gould, and W.C. Stwalley
"Rotationally-Resolved depletion spectroscopy of ultracold KRb molecules", Phys.
Rev. A 75, 032511 (2007).
B. C. Sawyer, B. K. Stuhl, D. Wang, M. Yeo and Jun Ye
"Molecular beam collisions with a magnetically trapped target", Phys. Rev. Lett.
101, 203203 (2008).
S. Ospelkaus, K-K Ni, G. Quemener, B. Neyenhuis, D. Wang, M.H.G. deMiranda, J.L.
Bohn, J. Ye and D.S. Jin
"Controlling the hyperfine state of rovibronic ground-state polar molecules",
Phys. Rev. Lett. 104, 030402 (2010)
S. Ospelkaus, K-K Ni, D. Wang, M.H.G. deMiranda, B. Neyenhuis, G. Quemener, P.
S. Julienne, J.L. Bohn, D. S. Jin and J. Ye
"Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules",
Science 327, 853 (2010)
K-K Ni , S. Ospelkaus, D. Wang, G. Quemener, B. Neyenhuis, M.H.G. deMiranda,
J.L. Bohn, J. Ye and D. S. Jin
"Dipolar collisions of polar molecules in the quantum regime", Nature 464, 1324
(2010)
D. Wang, B. Neyenhuis, M.H.G. deMiranda, K-K Ni, S. Ospelkaus, D. S. Jin and J.
Ye
"Direct absorption imaging of ultracold polar molecules", Phys. Rev. A 81,
061404(R) (2010)
CW single-frequency ring Dye laser DYE-SF-077 -
request a
quote
Frequency-stabilized CW single-frequency ring Dye laser, model DYE-SF-077, is a
further development of model DYE-SF-07. It now includes a system of frequency
stabilization on the basis of a thermo-stabilized interferometer and a fast
electronic driver.
Laser DYE-SF-077 features exceptionally narrow generation line width,
which
amounts to less than 100 kHz. DYE-SF-077 sets new standard for generation
line width of commercial lasers. Prior to this model, the narrowest line-width
of commercial dye lasers was as broad as 500 kHz - 1 MHz. It is necessary to
note that the 100-kHz line-width is achieved in DYE-SF-077 without the use of an
acousto-optical modulator, which, as a rule, complicates the design and
introduces additional losses. A specially designed ultra-fast PZT is used for
efficient suppression of radiation frequency fluctuations in a broad frequency
range
570-700 nm, output > 1.5 W (10 W pump), linewidth < 100 kHz rms, frequency drift
< 30 MHz/hour, smooth scanning 6/20 GHz.
The DYE-SF-077 laser cavity has horizontal orientation, the optical mounts of
the cavity elements are attached to a rigid base plate, which is further
stabilized by a volumetric framework with three invar rods underneath.
Additional passive stability of the position of cavity elements is provided by
the vibration isolating design of the laser base.
Dye laser DYE-SF-077 is the first representative of the new generation of dye lasers that offer to the user virtually the same level of convenience and simplicity of operation as with a solid-state tunable laser. As a result we are able to offer an option of combined configuration of DYE-SF-077 with Ti:Sapphire laser.
Laser DYE-SF-077 may be equipped with a USB compatible interface to remotely scan the generation line of the laser and to perform multi-channel data acquisition. Laser DYE-SF-077 also may be shipped together with an atom cell and a system for reduction of long-term generation line drift. Besides, laser DYE-SF-077 in combination with highly-efficient resonant frequency doubler FD-SF-07 delivers several hundreds milliwatts of narrow-band UV radiation within the 285–350-nm range.
CW single-frequency ring Dye laser DYE-SF-077 - request a quote
Specifications:
| Wavelength range | 570-620 nm 620-700 nm |
| Output | > 1 W at 6 W pump >1.5W at 10W pump |
| Linewidth | < 100 kHz rms1 |
| Frequency drift | < 30 MHz/hour |
| Smooth scanning | > 6 GHz3 |
| Spatial mode | TEM00 |
| Polarization | horizontal |
1. relative to the reference cavity
2. < 1 MHz/hour with frequency stabilization to an atomic/molecular line
(option)
3. up to 20 / 40 GHz (option)
Options:
1. 20 / 40 GHz smooth scanning;
2. 285-350 nm wavelength range with Resonant Frequency Doubler FD-SF-07
3. Absolute Frequency stabilization to an atomic/molecular line
4. + Ti:Sapphire laser (linewidth < 5 kHz) in the same Laser head
Dye Circulation System
CW single-frequency ring Dye laser DYE-SF-077 (Standard quotation) - request a quote
Actively frequency-stabilized, continuous-wave, single-frequency
ring Dye laser, model DYE-SF-077
Unique DYE-SF-077 laser has more narrow linewidth for Dye lasers on the present
market. DYE-SF-077 laser has super-narrow linewidth (< 70 kHz) and unique Auto
Re-lock function which is extremely useful in a work with frequency stabilized
laser.
Installation of the T&D Scan high resolution Laser Spectrometer based on broadly tunable CW laser at the Drexel University
Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics
sales@dmphotonics.com
www.twitter.com/TiSapphire