Coherence properties of high order harmonic radiation
- Lawrence Livermore National Lab., CA (United States)
- CEA Centre d`Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France) Service des Photons, Atomes et Molecules
The results of a series of experiments to characterize the coherence properties of xuv radiation produced by high-order harmonic generation in helium, neon and argon are reported and compared to predictions from an effective order model. The harmonics exhibit smooth, near gaussian spatial profiles, and have a divergence that is approximately constant ( < 12 mrad) in the plateau region and decreases ({approx}4 mrad) in the cutoff for f/17 focusing. For a bandwidth limited, 140 fsec incident pulse, we measure a harmonic line width of {Delta}{lambda}/{lambda} {approx} 2 {times} 10{sup {minus}3} at 30.3 nm. By reducing the spectral width of the driving pulse, harmonics with {Delta}{lambda}/{lambda} {approx} 2 {times} 10{sup {minus}4} can be produced. Absolute conversion efficiency as high as 10{sup {minus}7} for harmonic radiation as short as 20 nm has been achieved by using 400 fsec, 526 nm pulses from an Nd:Glass laser.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10174713
- Report Number(s):
- UCRL-JC-117330; CONF-940593-13; ON: DE94016974
- Resource Relation:
- Conference: 9. international conference on ultrafast phenomena,Dana Point, CA (United States),1-5 May 1994; Other Information: PBD: May 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-order sum and difference-frequency generation in helium
Optimization of harmonic generation from boron plasma