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.

Read more

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.

Read more: First Dense Gas Of Ultracold 'Polar' Molecules Created

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

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


 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)

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 of the CW single-frequency ring Dye laser DYE-SF-077Dye circulation system of the CW single-frequency ring Dye laser DYE-SF-077

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.

General description
•Ring design, three wavelength selectors: birefringent filter, thin and thick etalons, electronically controlled thick etalon to ensure laser operation in a single longitudinal-cavity mode.
•Ultra-narrow line width up to < 70 kHz rms: active frequency stabilization to an external reference cavity, special fast PZT actuator with extended response bandwidth.
•Unique function Smart Auto-Relock that allows uninterrupted laser operation in the frequency stabilization mode under arbitrary external perturbations.
•Smooth scanning capability: up to 20 GHz.
•Actively thermostated high-finesse reference cavity, frequency drift <40MHz/hr.
•External lock capability for stabilization to an absolute reference (e.g. iodine saturated absorption line).

Wavelength range, power
•Spectral ranges 570-620 / 620-700 nm
•Output power at max gain 590 / 650 nm 1W or better with 6W pump (DPSS, 532 nm, TEMoo).
•TEMoo mode, linear polarization.

•Absolutely dry dye-jet laser: the laser has a reliable shutter for the dye solution during powering up and switching off the circulation system.
•Most of the mounts are placed on a horizontal base plate, which is also the top element of the compact rigid 3-D frame made from three invar rods that ensures high stability of the optical element positions.
•Ease of adjustment, simplified laser alignment in the ring configuration because of preliminary optimization of the elements in the linear cavity, exceptionally accurate alignment of the pump beam position.
•Premium sapphire nozzle.
•Enclosed cavity with nitrogen purge port.
•Ergonomical and reliable electronic control unit featuring a built-in generator for smooth scanning of the laser frequency.

Dye Circulation System
•Compact and powerful system of dye solution circulation with a leak-free magnetically coupled pump.
•Efficient system for suppression of pressure fluctuations in the dye circulation loop.
•The dye solution circulation system of DYE-SF-077 is designed to make the procedure of dye change convenient and clean. Laser DYE-SF-077 may be shipped with several circulation systems, in which case switching between working spectral ranges will be extremely fast and simple.

Actively frequency-stabilized, continuous-wave, single-frequency ring Dye laser, model “DYE-SF-077”:
Wavelength range: 570-620 nm
Linewidth: < 100 kHz rms
Output power: > 1W@590nm at 6W pump (532 nm, TEMoo)
Smooth scanning: > 6 GHz
Frequency drift: < 40 MHz/hour
Polarization: horizontally polarized output
Auto-Relock function, external lock capability for stabilization to an absolute reference


Installation of the T&D Scan high resolution Laser Spectrometer based on broadly tunable CW laser at the Drexel University



DYE-SF-077 datasheet (1,2 Mb)


Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics